MECHANICS M.E. NEEP EXAM: VERIFIED QUESTIONS AND ANSWERS | 100% CORRECT

MECHANICS M.E. NEEP EXAM: VERIFIED QUESTIONS AND ANSWERS | 100% CORRECT “If rigging gear is roped 3:1 and a BEAM CLAMP is used to lift a 6,000lb load. What is the beam capacity? - CORRECT ANSWER 18,000lbs. Beam capacity is cut in half with use of clamp, when rigging all blocks, rope, and clamps will be Equal to the lowest load rating" "What is the overlap minimum on 2 & 3 speed doors? - CORRECT ANSWER Horizontal ½ inch Vertical 1 inch" "What are minimum and maximum clearance between sill and car doors? - CORRECT ANSWER ¼ inch Minimum 3/8-inch Maximum" "What is maximum leading edges for center opening doors? - CORRECT ANSWER ½ inch" "What is minimum sill to gib engagement? - CORRECT ANSWER ¼ inch" "What is minimum and maximum sill to sill gap? - CORRECT ANSWER ½ inch to 1 ½ inch" "1 gallon equals how many cubic feet? - CORRECT ANSWER .134 cubic feet" "How many gallons are needed to run a 6" plunger 30'? - CORRECT ANSWER 30' to inch= 360" 3x3x3.14=28.26 28.26x360=10,173.6/231=44.04 gallons 4" 25': 25x12=300 2x2x3.14=12.56x300=3768/231=16.3 gallons" "You see a saw tooth wave form when using an oscilloscope out of the encoder, is that good? - CORRECT ANSWER NO. A perfect encoder will show a square wave. Saw tooth, when encoder has a fault" "What is the weight of normal rails? 15 full 16' rails and 2 8' rails - CORRECT ANSWER 16 x 16' x 15lbs = 3840lbs" "What is the proper way to test incoming voltage? - CORRECT ANSWER 3 phase AC using digital meter: L1-L2 L1-L3 L2-L3 Hydro at pump starter. Traction at L1, L2, L3" "When replacing a PCB in a controller what precautions must be taken? - CORRECT ANSWER Use a grounding wrist strap, and never remove anything with the power on" "On an ANNUAL static load test, the car drifts down 15" in 10 minutes. There is no visible oil in the pit, where is the leak coming from? - CORRECT ANSWER Underground. Annual static test required for unexposed cylinders" "You are on a call and find the pulley came off the pump motor and the set screw is missing, what kind of screw would you use to replace the set screw? - CORRECT ANSWER Cup Screw" "You have to measure the outside of a pipe. What tool would you use? - CORRECT ANSWER Caliper Rule" "You are installing spring buffers on a 200fpm car, what is the minimum buffer stroke? - CORRECT ANSWER 4inch 100fpm 1 ½ inch 100fpm-150fpm 2 ½ inch 200fpm 4 inch" "You are going to replace the disc on your grinder, what test should you do before using? - CORRECT ANSWER Ring test" "How often do electrical cords need to be checked for continuity? - CORRECT ANSWER Every 3 months" "The DBG is 6'6" using 15lb rails with ¼ shim on the brackets, what is DBB? - CORRECT ANSWER 7' 1 ½" 15lb rail is 3 ½ deep so 7" total. 2 ¼" shim is ½". 6'6" + 7 ½" =7 foot 1 ½ inch" "How does OSHA classify a competent person? - CORRECT ANSWER One who is capable of identifying existing and potential hazards, and who has authorization to take prompt, Corrective measurements" "Car weighs 7,000lbs with a capacity of 3,500lbs. what does the CWT weigh? - CORRECT ANSWER 8,400lbs 3500 x 40 / 100=1,400lbs 7,000 + 1,400 = 8,400" "You have attempted to start up a 3 phase AC motor and stalls then hums or growls? - CORRECT ANSWER If the rotor bar becomes loose at the ring connection, or if the rotor bar cracks, current cannot flow through The bar and the entire rotor field is disrupted, causing loud growl or humming sound" "Your fluke digital Multimeter reads 440vac, what value are you reading? - CORRECT ANSWER 440vac RMS" "You have determined that the period of an oscillation that you can feel in the car is .5 seconds. What is the frequency of the oscillation? - CORRECT ANSWER 2hz Frequency from time or Period F=1/T F=1/.5= 2hz" "Freight doors are binding because they are hanging out of square, what adjustments can you make? - CORRECT ANSWER Adjust door track chains" "You are about to start installing your duct run in the hoist way. What is the best method to give you the straightest line? - CORRECT ANSWER Using a plumb bob, snap the line, and measure off of the rail" "When installing multiple Traveling cables, where is the 1st cable located? - CORRECT ANSWER 1 st is closest to the rail." "2 controllers in a small machine room face each other, what is the minimum clearance between them? - CORRECT ANSWER 36 inches" "When installing travelers, what is the minimum length of vertical suspension at both ends before the loop starts? - CORRECT ANSWER 4 feet" "You attempt to adjust a new VV-VF door operator, but it operates in the wrong direction. How do you change the direction? - CORRECT ANSWER Change the phase sequence" "There is a call that a traction elevator is stuck in the overhead. In order to get the car down, what circuits do you need to jump out? - CORRECT ANSWER The primary safety circuits" "Installing Horizontal sliding doors with guides in each door panel, how far must each guide engage the sill gauge? - CORRECT ANSWER ¼ inch" "Your supervisor informs you to change software on a hydro microprocessor board. The software is a 24 pin DIP package. To properly orientate the new chip on the board, what must you do? - CORRECT ANSWER Verify that the notch on the dip chip matches the notch on the board" "You need to speed up an AC motor that has a fixed number of poles. How can you speed it up using the RPM formula? - CORRECT ANSWER Change the frequency. RPM= 60 x F / P/2" "You have finished digging a hole hydro, the jack is not on site. What must the hole have on it before you leave? - CORRECT ANSWER A welded cover" "A CWT frame weighs 10,000lbs and needs to be increased by 5%. What is the new weight of the frame? - CORRECT ANSWER 10,500lbs 10,000 x 5 / 100= 500lbs +10,000 = 10,500lbs" "You have 32' of rise in scaffolding and are using a 3'x5' base. Where are tie offs? - CORRECT ANSWER 1st at 12' and cannot be more than 26' apart vertically 30' apart horizontally" "How is a step level switch on an escalator reset? - CORRECT ANSWER Manually" "What is the Law of Power? - CORRECT ANSWER P=ExI" "What is the maximum voltage drop that can occur across a 500watt resistor carrying 2amps of current? - CORRECT ANSWER 250 volts P/I 500/2=250" "While testing for a locked rotor condition, what could happen if the testing was carried on for too long? - CORRECT ANSWER Damage to the stator or rotor" "What is needed to coordinate the movement and to dispatch hall calls? - CORRECT ANSWER A group controller" "Where is weight added on a freight door for balancing? - CORRECT ANSWER On the top." "What door is heavier on bi-parting freight doors? - CORRECT ANSWER The lower door because of the tucking sill" "what is the conversion for Kg to pounds? - CORRECT ANSWER 1 Kg = 2.205 pounds" "what is the purpose of a gear reduction unit on a geared machine? - CORRECT ANSWER Increased lifting capacity" "At what speed should the Gov. switch be set to open? - CORRECT ANSWER Electrical - 90% of tripping speed for 150 -500 fpm. 95% for anything over 500 fpm." "at what distance from closed does the gate switch operate? - CORRECT ANSWER 2"" "What are the most common features of Load weigh? - CORRECT ANSWER Control the generator field and inside express operation" "does a GFCI work? - CORRECT ANSWER Detects imbalance between hot and neutral wires" "A motor needs a sleeve bearing replaced, what type of bearing do you need? - CORRECT ANSWER Friction Bearing (anti-friction bearing = ball bearing)" "Using binary logic, What dip switches must be on for a 128 bit 30 second timer at 150%? - CORRECT ANSWER 1,3,4,6 = 45 seconds" "How do you attach brackets to brick? - CORRECT ANSWER Inserts set back 1/4' into the block. code could call for through bolt." "The DBG is 6'6" using 15 pound rails with 1/4" shim on the brackets, what is DBB? - CORRECT ANSWER 15 pound rails are 3 1/2" deep (x2) = 7" 1/4" shim (x2) = 1/2" 6'6"+7 1/2" = 7' 1 1/2"" "How does OSHA classify a competent person? - CORRECT ANSWER One who is capable of identifying existing and potential hazards, and who has authorization to take prompt, Corrective measurements" "Car weighs 7,000lbs with a capacity of 3,500lbs. what does the CWT weigh? - CORRECT ANSWER 3,500 pounds x 40% = 1400 pound 7000 pounds + 1400 pounds = 8400 pounds" "Installing a 3,000lb capacity car, how much load will the break stop and hold? - CORRECT ANSWER 125% of rated capacity 3000 pounds x125% = 3,750 pounds" "On traction elevators where are the bottom guide shoes mounted? - CORRECT ANSWER to the safety plank" "You need to find the DBG for the car, where would you find this information? - CORRECT ANSWER Final layout or hoistway plan view drawing" "What is the max distance between vertical raceway supports? - CORRECT ANSWER 15 ft." "during a MOD where would you find asbestos? - CORRECT ANSWER old doors" "you have a 2 to 1 roped car and the counterweight is compressing the buffer by 4 inches, how much rope do you need to cut off to have an 18" runby? - CORRECT ANSWER 44 inches" "You replace a blown motor at 10 amps and you find the secondary transformer open. the primary is 480, the secondary is 240, what do you replace it with? - CORRECT ANSWER 3 kva step down" "When do you use a wrist grounding strap? - CORRECT ANSWER When replacing discrete electronic components with the power off only" "peak voltage is 325.22. What is the effective value? - CORRECT ANSWER 230 volts (325.22x7)" "going from a 1:1 to a 2:1 configuration what will happen? - CORRECT ANSWER Car will lift twice the load at half the speed" "you get a full load 5 year test at 125% and the car wont hold the weight, why? - CORRECT ANSWER Worn Brake pads" "you have a timer that is set for thirty seconds, they want you to change it to 1.5 times the current time. What do you do? - CORRECT ANSWER 45 seconds = 101101 (6,4,3,1, switches are high)" "You have a pump motor that runs 100 gpm and you need it to run 125gpm, you have 12 inch pulley on it now, what size pulley will you need to put on it? - CORRECT ANSWER 15 "" "Where do you find step level switches? - CORRECT ANSWER Top and Bottom turns" "contractor wants you to move a rack and pinion hoist, what is needed on the ties? - CORRECT ANSWER Extension Tubes" "you have a temp platform that weighs 1500 pounds and a counterweight frame that weighs 250 pounds your counterweight fillers are 30x8x2 and weigh .25 pounds per cubic inch. How many fillers do you need to balance the car? - CORRECT ANSWER 11" "how many millimeters are in an inch? - CORRECT ANSWER 25.4 mm" "What is 90 seconds in binary? - CORRECT ANSWER " "5 year test is called what? - CORRECT ANSWER Rated load test" "how do you stack doors? - CORRECT ANSWER vertically the long way on edge." "What is a typical reading on a high rise door lock circuit? - CORRECT ANSWER 1.8" "What type of safeties would you have on a car that goes 300 fpm? - CORRECT ANSWER Type B" "What kind of safeties are needed on a false platform? - CORRECT ANSWER Spring tight safeties" "What tool do we use to read ripple voltage? - CORRECT ANSWER oscilloscope" "you have 4 windings, 3 of them are dropping 30 volts. The 4th is dropping 40 volts. why is the last one dropping more? - CORRECT ANSWER More resistance" "you shut off the mainline on a freight car and go to work on the doors only to find out they were still alive. What is the problem? - CORRECT ANSWER Door operator has its own power source" "When a grinder wheel makes a dull noise when doing a ring test what is the situation? - CORRECT ANSWER it is cracked." "When changing a packing what must be done first? - CORRECT ANSWER hone the piston" "When changing a packing, what must be done to prevent unintentional movement? - CORRECT ANSWER block up the car" "general contractor wants to know when you need an escape hatch in a residential elevator? - CORRECT ANSWER When there is no manual lowering." "You find a problem with a barricade on the 45th floor of your job, based on OSHA requirements, what are you required to do? - CORRECT ANSWER Make a hand written request to get it repaired." "When doing a mod and you go to an scr drive but you keep the DC motor, what phase do you use? - CORRECT ANSWER 3 phase" "if you are tasked with testing the slide through on safeties, which type of safeties would you be testing? - CORRECT ANSWER Pull through safeties (type c)" "On a roped hydraulic what do you tie the pressure switch into? - CORRECT ANSWER Down travel circuit" "How do you read current? - CORRECT ANSWER Ammeter in series with circuit" "your brushes are sparking, what could be the problem? - CORRECT ANSWER High Mica" "elevator cannot reach the final limit in the up direction, what is wrong? - CORRECT ANSWER Shorten the hoist ropes" "How do you check incoming current? - CORRECT ANSWER individually with a clamp on meter" "Where do you find asbestos in a 1960 building? - CORRECT ANSWER fire proofing" "you have a blown mainline fuse that is too burnt to see the amp rating. How do you check current to the circuit to find a replacement? - CORRECT ANSWER put your ammeter across the two fuse terminals" "you have a two lead permanant magnet motor that wont open or close the doors, what is wrong? - CORRECT ANSWER stuck brush" "you are drilling a hole and the gfci trips. where is the imbalance of current? - CORRECT ANSWER between the hot and neutral" "how many pan switches are required in a vertical platform lift? - CORRECT ANSWER Minimum of 2 at 15 pounds of pressure. Must stop within 2 inches." "Do you disconnect all the leads from a motor when using a meggar? - CORRECT ANSWER yes" "you are installing beams for an overhead geared traction machine. What holes do you have to layout and drill prior to installing? - CORRECT ANSWER secondary sheave holes" "you are installing a geared machine, what do you use to prevent laternal movement? - CORRECT ANSWER kick angles" "in a circuit with a capacitance of 5mf 120v and 200k ohm how long to fully charge? - CORRECT ANSWER 5 tc .005x200=1tc 1x5=5 to fully charge 1 time constant = 63.2% 5 time constant = 99%" "What door is hevier on bi-parting freight doors? - CORRECT ANSWER The lower door because of the tucking sill" "Where is weight added on a freight door for balancing? - CORRECT ANSWER on the top" "What is added to coordinate the movement and dispatch hall calls? - CORRECT ANSWER a group controller" "While testing for a locked rotor condition, what could happen if the testing was carried on for too long? - CORRECT ANSWER Damage to the stator or rotor" "What is the minimum voltage drop that can occur across a 500 watt resisitor carrying 2 amps of current? - CORRECT ANSWER 250 volts P/I= 500/2=250" "What is the law of power? - CORRECT ANSWER P=ExI" "How is a step level switch on an escalator reset? - CORRECT ANSWER Manually" "You have 32' of rise in scaffolding and are using a 3'x5' base. Where are tie offs? - CORRECT ANSWER 1st at 12' and cannot be more than 26' apart vertically nor 30' apart horizontally" "a CWT frame weighs 10,000 pounds and needs to be increased by 5% what is the new weight of the frame? - CORRECT ANSWER 10,000 x 5%= 500 10,000 + 500 = 10,500 pounds" "you have finished digging a hole for a hydro. the jack is not on site. What must the hole have on it before you leave? - CORRECT ANSWER a welded cover" "you need to speed up an AC motor that has a fixed number of poles. How can you speed it up using the RPM formula? - CORRECT ANSWER Change the frequency. RPM = 60 x F/P/2" "Your supervisor informs you to change software on a hydro micro-processer board. The software is a 24 pin, DIP package. To properly orientate the new chip on the board, what must you do? - CORRECT ANSWER Verify that the notch on the dip chip matches the notch on the board" "installing horizontal doors with guides in each door panel, how far must each guide engage the sill guage? - CORRECT ANSWER 1/4"" "you just pulled multi-cables down the hoistway of a highrise. how should you provide strain relief for the cables? - CORRECT ANSWER required every 100 ft begin installing at the lowest and work upwards to adjust and tension" "there is a call that a traction elevator is stuck in the overhead. in order to get the car down what circuits do you need to jump out? - CORRECT ANSWER The primary safety circuits" "A DC motor supplied from a 3 phase rectifier runs slow. The DC voltage is normally 320 but is reading 220, what should you do? - CORRECT ANSWER Check the fuse feeding the AC rectifier" "you find a blown fuse in the DC circuit feeding the door motor, When picking the replacement fuse what should you do? - CORRECT ANSWER compare the blown fuse to the fuse rating in the straight line diagram" "When going to a trouble call you find that the machine room has 2 inches of water in it, what is the first thing you do? - CORRECT ANSWER Leave the machine room" "troubleshooting a 3 input AND gate all inputs are high but the gate output is low. What is the problem? - CORRECT ANSWER Faulty gate. (truth table says output should be high)" "The fuses on a 3 phase input to DC direct drive are open and the elevator will not run, what needs to be done to check for a shorted SCR? - CORRECT ANSWER Remove the SCR, connect +lead to anode, -lead to cathode, jumper between anode and gate. .7v if good Remove jumper and it should stay on. remove a lead and it should read infinite" "You are about to troubleshoot an elevator that is off. what print would help to make it easier to trace the circuits? - CORRECT ANSWER Straight line diagram" "while on service you observe the mechanical safety edges on center opening doors bumping into each other and reopening the doors. where do you need to look to repair this problem? - CORRECT ANSWER The safety edge retraction mechanism." "you are preparing to hoist the car for cable installation. before doing this, what needs to be installed? - CORRECT ANSWER The governor cable" "Before you move a pison on a hydro, what precautions must be taken? - CORRECT ANSWER Check the piston for debris and tightness of the head. Make sure pit is clear." "you momentarily actuate the motor starting relay. the direction of rotation is not correct. what can be done to change the rotation direction? - CORRECT ANSWER Reverse any 2 leads of incoming motor phases" "after receiving an inspection report , one violation is door closing force. after checking, you read 50 pounds of door force. is this code? how do you make it code compliant? - CORRECT ANSWER Not code. Code is 30 pounds or less. To fix it you need to adjust the torque/speed of the door operator." "What does ASME code specify regarding clearance between skirt panel and the side of the step tread? - CORRECT ANSWER Skirt board switches are required at upper and lower ends with a gap no more than 3/16"" "While adjusting a passenger elevator door operator with a permanent magnet DC motor, which operation would you perform to control the motor? - CORRECT ANSWER Speed and torque control is accomplished by varrying armature current and voltage only" "escalator demarcation lights are required by code for what reason? - CORRECT ANSWER To provide passengers with a visual indication when entering and exiting the unit." "as a mechanic you are sent to install an escalator. What point of reference would you use to square the unit? - CORRECT ANSWER The column line" "in order to properly bond an isolation platform, where should you connect your bonding straps? - CORRECT ANSWER From the platform to the car sling" "you receive a call that a center opening car is running with the door partially open, how is this possible? - CORRECT ANSWER The gate switch is activated by the door drive, but the relating device has failed" "You attempt to adjust a new VV-VF door operator, but it operates in the wrong direction. How do you change the direction? - CORRECT ANSWER Change the phase sequence" "When installing travelers, what is the minimum length of vertical suspension at both ends before the vertical loop starts? - CORRECT ANSWER 4 ft." "2 controllers in a small machine room face each other, what is the minimum clearance between them? - CORRECT ANSWER 36"" "When installing multiple traveling cables, where is the first cable located? - CORRECT ANSWER The 1st is closest to the rail." "you are about to start installing your duct run in the hoistway. What is the best method to give you the straightest line? - CORRECT ANSWER using a plumb bob. snap a line and measure off of the rail." "freight doors are binding because the doors are hanging out of square. What adjustments can you make? - CORRECT ANSWER adjust door track chains" "customer is complaining that the elevator is having a door problem on every floor. Where do you start troubleshooting? - CORRECT ANSWER The car doors" "You have determined that the period of an oscillation that you feel in the car is .5 seconds. what is the frequency of the oscillation? - CORRECT ANSWER 2 Hz (frequency from time or period) F = 1/TF = 1/.5= 2Hz" "Your fluke digital Multimeter reads 440vac, what value are you reading? - CORRECT ANSWER 440 vac RMS" "You have attempted to start up a 3 phase AC motor and it stalls , then hums or growls? - CORRECT ANSWER If the motor bar becomes loose at the ring connection or if the rotor bar cracks , current cannot flow through the bar and the entire field is disrupted causing a loud growl or humming sound." "you need to replace an unmarked single phase transformer with primary voltage at 220 vac, current at 5 amp. What size would you need to double it? - CORRECT ANSWER Kva sizing must be calculated from primary or secondary volt + amp info. Single phase kva = (vx1) / 1,000kva = 220 x 5 = 1100/1000 = 1.1 kva 2.2 kva needed to double." "you have 26, 16', 22pound rails and 2, 8' 22 pound rails. what is the total weight of the rails? - CORRECT ANSWER 27 x 16 x 22 = 9,504 pounds" "You're pulling 15 #14 awg, 27 #16 awg and 57 #18 awg wires. how many spares are needed? - CORRECT ANSWER 2-#14 3-# 16 6-#18 (10% spares required)" "exciter voltage comes from what source? - CORRECT ANSWER generator" "How could you connect an ohm meter to check load resistance? - CORRECT ANSWER Black to common Red to V ohm switch at ohm (no power, take one lead off, connect in parallel. Analog needs to be zeroed 1st.)" "In a series circuit with a 10k ohms resistor and a 2mA current. what is the voltage? - CORRECT ANSWER 20v E = R x I 10,000 x .002 = 20v" "Customer is complaining that an older SCR drive is powered elevator is causing noise in the building power lines. What can help reduce the noise? - CORRECT ANSWER isolation transformer (used to minimize electrical noise from being reflected back to the supply lines.)" "Which maintenance procedure addresses the issue of proper DC generator commutation? - CORRECT ANSWER continued contact between brushes and commutator" "What hydro piece uses electrical power using the principle of electromagnetism? - CORRECT ANSWER hydro valve solenoid (electro-mechanical device operated by a coil and having an iron core steel plunger as an armature)" "sometimes it is necessary to increase output of a DC generator to overspeed an elevator as part of the safety test. if maximum output is reached and speed cannot be increased it is said to be what? - CORRECT ANSWER Saturated: cannot produce anymore magnetic lines of flux" "how do you measure AC voltage on a digital multimeter? - CORRECT ANSWER Function to VAC Red lead to volt ohm Black lead to common" "You suspect a phasing issue with building power. Which controller device should you check 1st? - CORRECT ANSWER reverse phase relay: detects if incoming power has a loss of phase or phase reversal" "The motorfield windings on a DC motor are wound around a laminated core. the composition of the core material is dependent upon which characteristics? - CORRECT ANSWER Permeability: The ability of a substance to pack in magnetic lines of flux in a given space." "installing a 3,000 pound capacity car, how much load will the brake stop and hold? - CORRECT ANSWER 3,750 pounds 125% of rated capacity: 3,000 x 125% = 375,000/100 = 3,750" "responding to a job on a hydro, you determine that the 50 amp circuit breaker that feeds the controller has tripped. what component of the elevator has the capability to cause this problem? - CORRECT ANSWER The pump motor." "you are hoisting rails into the hoistway using a capstan hoist. your apprentice is having a hard time pulling in rails. what can be done to make it easier? - CORRECT ANSWER add another or more wraps to the capstan hoist." "You have a hoist rated at 3,000lbs, if you use a double block to single block reeving, what would your total lifting capacity be? - CORRECT ANSWER " "What are the consequences of misaligned joints on a Rack and Pinion? - CORRECT ANSWER Broken Gear teeth. CWT derailment. Excessive wear/ crease the surface of the tube" "There is a noise coming from a freight door. The sheave is moving, but the chain is not. What is the problem? - CORRECT ANSWER Oil on the drive chain" "What is the effect when you change a sling angle from 60 degrees to 30 degrees? - CORRECT ANSWER More tension, less capacity. Any angle 30 or less is dangerous" "Generator runs at 600rpm and has 4 poles, what is the output frequency? - CORRECT ANSWER 20hz 600/60=10 10x2=20 RPM 60 x frequency / pole/2" "How many wires are needed for the following circuit? Exclude spares. BCE---SPI/BCD---SP2/BCD---SP4/BCD---UR1/BCE---UR2/BCE---DR1/CRE--- DR2/GRD - CORRECT ANSWER 11 wires. You do not need the duplicates" "How must a 9 lead 480/240 motor be wired for High Voltage? - CORRECT ANSWER L1(1) L2(2) L3(3) Low Voltage L1(1-7) L2(2- 8) L3(3-9) 7-4 8-6 9-5 4 5 6 + 120v______0-------0_______R2________A_________R1_______GRD" "There is voltage at the switch, but none at A, what is wrong? - CORRECT ANSWER Open at R2 or R1" "The close door limit switch is not working, you have power at points 35-8, no voltage at 1-S2 why? - CORRECT ANSWER Door limit switch malfunction" "The step level switch on an escalator has been tripped, where do you check? - CORRECT ANSWER Upper and Lower Truss assemblies, trips if step sags more than 1/8th inch" "A motor needs a sleeve bearing replaced, what type of bearing do you need? - CORRECT ANSWER Friction bearing AKA Sleeve bearing. Anti-Friction Bearing AKA Ball bearing" "What type of safeties are required on a 300fpm car? - CORRECT ANSWER Type B wedge clamp" "What stopping devices are required on vertical platforms? - CORRECT ANSWER 2 pan switches. 15lbs max pressure" "What are the most common features of Load Weigh? - CORRECT ANSWER Control generator field and Inside express operation" "At what distance from closed does the gate switch operate? - CORRECT ANSWER 2 inches" "If the DC output of a 3 phase rectifier is lower than specified, what is the problem? - CORRECT ANSWER AC fuse is blown. 1 input phase is missing" "A force of 5,000lbs is applied to a plunger with an area of 25sqin. What is system pressure? - CORRECT ANSWER 200psi 500/25 PRESSURE=FORCE/AREA AREA=FORCE/PRESSURE" "What is the definition of working pressure? - CORRECT ANSWER Fully loaded to capacity, Full speed running up" "On a geared machine the worm and worm gear are made out of what materials? - CORRECT ANSWER Steel and Bronze" "What is the purpose of a gear reduction unit on a geared machine? - CORRECT ANSWER Increased lifting capacity" "What holds a stopped Hydraulic elevator? - CORRECT ANSWER Check valve" "What must be done if you get on top of a dumbwaiter? - CORRECT ANSWER Never fully get on top. Work only partially on with the mainline disconnect off" "How do you measure an escalator hand rail? - CORRECT ANSWER Mark the top and bottom of the inclination, measure in between and move the car until the bottom mark is at the top, measure again and continue doing this until you see your 1st mark. The last measurement will be shorter. Add all the measurements together to get your length." "A moving walk has an inclination of 10degrees, what is the highest angle it can be? - CORRECT ANSWER 12degrees escalator 31degrees" "In a Ward-Leonard system, if all 3 contacts close what will happen? - CORRECT ANSWER The car will run at full speed" "What type of oil do you put in a machine? - CORRECT ANSWER Gear oil, non-detergent, single viscosity" "If a Rack and Pinion hoist is not plumb, level and square. What can happen? - CORRECT ANSWER Set the Safeties" "What are extension tubes used for? - CORRECT ANSWER Necessary clearance for placement of concrete forms." "If a hoist motor is making noise, what is the problem? - CORRECT ANSWER To help prevent distortion to the building AC supply, INDUCTORS can be used on AC input of a solid state drive. Inductors can serve double duty, they operate as Transformers, to match input voltage, or provide voltage isolation. As well as performing filtering on notch effect." "What is the area of a 10" plunger? - CORRECT ANSWER Pie x Radius Squared= Area 3.14x5x5=78.5" "The escape hatch opens in what direction? - CORRECT ANSWER From the outside of the car up, preventing people from getting on top of the car" "What drawing will show how many and location of fixtures? - CORRECT ANSWER The elevator Abstract. Rails, lanterns, push buttons, etc. and quantity, color, material, etc" "You have to order P.I. for a 12 stop building with 3 cars. 3 floors do not have P.I. what is the total number of P.I. you need to order? - CORRECT ANSWER 12x3=36 total floors 3 floors with no p.i.=9 36-9=27 P.I. needed" "If an elevator travels 1760rpm @ 60hz, how many hz needed to run at 600fpm? - CORRECT ANSWER 20hz 600/60=10 assume 4 poles. 10x2=20" "What training must be done before you can enter a pit that has been classified as a confined space? - CORRECT ANSWER Confined space entrant training" "Traction and Hydraulic machines have many hazards, what is most dangerous? - CORRECT ANSWER Rotating Equipment" "You are installing a machine and sheave, where would machine and secondary sheaves be aligned? - CORRECT ANSWER In the center of the Rail measurements" "You are testing an elevator with a rated speed of 500fpm. What is the minimum speed the safeties should set at? - CORRECT ANSWER 575fpm. Mechanical:115% x 500=575. Electrical:90% x 575=517.5fpm" "You are installing machines, governors, and generators, and need to know the location where it needs installed. Where would you find the information? - CORRECT ANSWER The machine room plan view" "What is the minimum breaking strength of a wire rope used as Life Safety? - CORRECT ANSWER 5,000 pounds" "You go to a trouble call and the building owner keeps asking when the car will be back up and if you can take any short cuts to get it up faster. What is your response? - CORRECT ANSWER Give a reasonable response on time and safety factors. If that doesn't work, he can **** OFF" "What are 3 major factors in Hydraulic pit maintenance? - CORRECT ANSWER Oil, Tripping hazards, Electricity" "What is the tolerance for 3/8 at .003? - CORRECT ANSWER 372-.378 bilateral=2 direction unilateral=1 direction" "You are working with EYE BOLTS, where would you check for lifting capacity? - CORRECT ANSWER NEVER use eye bolts for hoisting" "You are installing the limit cam on the car and notice that the holes are not lining up. Where do you find the correct location for the cam? - CORRECT ANSWER The mechanical detail drawing" "You are stacking rails in a single hydro hoist way, with a rise of 48' how many rails will you need? - CORRECT ANSWER 6 total rails 48' / 16' = 3 3 x 2 sides = 6 rails" "Installing a 3,000lb capacity car, how much load will the break stop and hold? - CORRECT ANSWER 3,750lbs 125% of rated capacity 3,000 x 125 = 375,000 / 100 = 3,750" "On traction elevators where are the bottom guide shoes mounted? - CORRECT ANSWER To the safety plank" "You have a hoist rated at 3,000lbs, if you use a double block to single block reeving, what would your total lifting capacity be? - CORRECT ANSWER 6,000lbs" "You need to find the DBG for the car, where would you find this information? - CORRECT ANSWER Final layout or Hoistway plan view drawing" "You are hoisting rails into the hoist way using a capstan hoist, your apprentice is having a hard time pulling in rails. What can be done to make it easier? - CORRECT ANSWER Add another or more wraps to the capstan hoist" "Responding to a call on a hydro, you determine that the 50amp circuit breaker that feeds the controller has tripped. What component of the elevator has the ability to cause this problem? - CORRECT ANSWER The pump motor" "The motor field windings on a DC motor are wound around a laminated core. The composition of the core material is dependent upon which characteristics? - CORRECT ANSWER Permeability: the ability of a substance to pack in magnetic lines of flux in a given space" "You suspect a phasing issue with building power. Which controller device should you check 1st? - CORRECT ANSWER Reverse phase relay: detects if incoming power has a loss of phase or phase reversal" "How do you measure AC voltage on a Digital Multimeter? - CORRECT ANSWER Function to VAC Red lead to Volt ohm Black lead to common" "Sometimes necessary to increase output of a DC generator to over speed an elevator as part of the safety test. If maximum output is reached and speed cannot be increased, it is said to be what? - CORRECT ANSWER Saturated: cannot produce any more magnetic lines of flux" "Which of the following maintenance procedures addresses the issue of proper DC generator commutation? - CORRECT ANSWER Continued contact between brushes and commutator" "Customer is complaining that an older SCR drive powered elevator, is causing noise in the building power lines. What can help reduce the noise? - CORRECT ANSWER Isolation Transformer: Used to minimize electrical noise from being reflected back to supply lines" "In a series circuit with a 10K ohm resistor and a 2mA current, what is Voltage? - CORRECT ANSWER 20v E=R x I 10,000 x .002= 20v" "How would you connect an ohm-meter to check load resistance? - CORRECT ANSWER Black to common Red to V ohm Switch at Ohm. No power, take one lead off, connect in parallel Analog needs to be Zeroed 1 st" "Exciter voltage comes from what source? - CORRECT ANSWER Generator" "Your pulling 15 #14awg 27 #16awg 57 #18awg wires. How many spares needed? - CORRECT ANSWER 2 #14 3 #16 6 #18 10% spares required" "You have 26 16' 22lb rails and 2 8' 22lb rails, what is the total weight of the rails? - CORRECT ANSWER 27 x 16 x 22 = 9504lbs" "You need to replace an unmarked SINGLE PHASE transformer with primary voltage at 220vac current at 5amp. What size would you need to double it? - CORRECT ANSWER KVa sizing must be calculated from primary or secondary volt + amp info Single phase kVa=(VxI) / 1,000 kVa=220x5=1100 / 1000= 1.1 kVa 2.2 kVa needed to double" "You receive a call that a center opening car is running with one door partially open, how is this possible? - CORRECT ANSWER The gate switch is activated by the door drive, but the relating device has failed" "In order to properly bond an isolation platform, where should you connect your bonding straps? - CORRECT ANSWER From the platform to the car sling" "As a mechanic you are sent to install an escalator, what point of reference would you use to square the unit? - CORRECT ANSWER Column LINE" "Escalator demarcation lights are required by code for what reason? - CORRECT ANSWER To provide passengers with a visual indication when entering and exiting the unit." "While adjusting a passenger elevator door operator with a PERMANENT MAGNENT DC motor. Which operation would you perform to control the motor? - CORRECT ANSWER Speed and Torque control is accomplished by varying armature current and voltage only SHUNT MOTORS: shunt voltage increases, torque increases, speed decrease. Shunt voltage decreased, torque decrease, speed increase Armature voltage increase, rotation speed increase affecting door speed and torque." "What does ASME code specify regarding clearance between skirt panel and the side of the step tread? - CORRECT ANSWER Skirt board switches required at upper and lower ends. Gap no more than 3/16"" "You momentarily actuate the motor starting relay, the direction of rotation is not correct, what can be done to change rotation direction? - CORRECT ANSWER Reverse any 2 leads of incoming motor phases." "You are preparing to hoist the car for cable installation, before doing this, what needs to be installed? - CORRECT ANSWER The governor cable" "While on service you observe the mechanical style safety edges on center opening doors bumping into each other, reopening the doors. Where do you need to look to repair this problem? - CORRECT ANSWER The safety edge retraction mechanism" "You are about to trouble shoot an elevator that is off, what print would help to make it easier to trace the circuits? - CORRECT ANSWER Straight Line Diagram" "The fuses on a 3 phase input to DC direct drive are open, and the elevator will not run, what needs to be done to check for a shorted SCR? - CORRECT ANSWER Remove the SCR, connect +lead to Anode, -lead to cathode, jumper between ANODE & GATE .7v if good. Remove jumper and it should stay on, remove a lead should read infinite" "Trouble shooting a 3 input AND gate, all inputs are high, but the gate output is low. What is the problem? - CORRECT ANSWER Faulty gate. Truth table says output should be high." "When going to a trouble call you find that the machine room has 2 inches of water in it, what is the first thing you do? - CORRECT ANSWER Leave the Machine room" "You find a blown fuse in the DC circuit feeding the door motor. When picking a replacement fuse what should you do? - CORRECT ANSWER Compare the blown fuse to the fuse rating in the straight line diagram" "A DC door motor supplied from a 3 phase rectifier runs slow. The DC voltage is normally 320 is 220. What should you do? - CORRECT ANSWER Check the fuse feeding the AC rectifier" "What happens to the break when contact E opens? - CORRECT ANSWER Inserts more break resistance in the circuit, reducing the value of the break current. More resistance to hold the coil up and release current draw." "In a circuit with capacitance of 5mf 120v and 200K ohm, how long to fully charge? - CORRECT ANSWER 5TC .005 x 200 = 1(TC) 1 x 5 = 5 to fully charge. 1 time constant = 63.2% 5 time constant = 99%" "Valve Operations: - CORRECT ANSWER Check valve: oil flow in 1 direction Up valve: controls up start and accel to high speed, up slow down, up level, up stop Down valve: Elevator not running so it depends on system pressure Bypass and Relief: bypass oil if striking obstruction. If relief pressure is too low it will not pick" "SCR: - CORRECT ANSWER DC door motor control and commonly in direct drives. 3 terminal device acts as on/off switch by pulsing the gate with positive voltage Once on SCR remains on until Anode & Cathode voltage equalizes, or Anode & Cathode are reverse biased, or until voltage is removed from Anode & Cathode" "Amplifiers: - CORRECT ANSWER Inverting: Op amp(input) supplied to. NEGATIVE Non inverting: Input. POSITIVE" "Inductance in a DC Break: - CORRECT ANSWER R1 controls rate the magnetic field builds, R1 controls time it takes the break to energize after the BR contact closes. R2 is the discharge path for the break coil. R2 controls the time it takes the break to set when BR opens. R2 controls voltage spikes from the collapsing magnetic lines of the break coil when discharging, thus reducing spikes from reaching other parts of the circuit." What is the overlap minimum on 2 and 3 speed doors? - CORRECT ANSWER horizontal - 1/2" vertical - 1"" "what are the minimum and maximum clearances between sill and car doors? - CORRECT ANSWER 1/4" Minimum 3/8" Maximum" "What is the minimum and maximum sill to sill gap? - CORRECT ANSWER 1/2"- 1 1/2"" "1 gallon equals how many cubic feet? - CORRECT ANSWER .134 cubic feet" "how many gallons are needed to run a plunger 30'? - CORRECT ANSWER Convert 30' into inches = 360" 3x3x3.14=28.26 28.26x360=10,173.6 10,173.6/231=44.04 gallons" "A car weighs 2500 pounds with a capacity of 2500 pounds. The CWT is weighted at 40% how much is the motor lifting when the car is fully loaded? - CORRECT ANSWER 2500(car)+1000(40%)=3500 =1500 pounds lifted by the machine." "what are the consequences of misaligned joints on a rack and pinion? - CORRECT ANSWER -Broken gear teeth -CWT derailment -excessive wear -crease the surface tube." "a 480 vac step down 240 vac transformer is connected to a 3 phase rectifier, what is the output voltage? - CORRECT ANSWER 320 vac 3 phase full wave =1.33x output voltage 1.33 x 240= 319.2" "a 300 ohm resistor burns out but you don't have another one , how can you make one? - CORRECT ANSWER 2 - 600 ohm resistors in parallel is 300 ohms. (resistance is half of the highest resistor in a parallel circuit) 3 - 225 ohm resistors in parallel is 75 ohms" "how is a class1 yearly buffer test performed? - CORRECT ANSWER car at the bottom landing and on inspection. Jump out direction and final limits. with the pit clear run down to compress the buffers. The buffers should fully extend in 90 seconds. (5 year: full load, full speed) (CWT: full speed, empty)" "you need to work on a frieght door retiring cam, you LOTO the mainline but there is still power on the cam. What circuit is still hot? - CORRECT ANSWER -Door operator disconnect -Mainline disconnect." "a contractor wants to raise the car speed from 100 fpm to 125 fpm. it currently has a 12" sheave. What size sheave is required? - CORRECT ANSWER Diameter = 12" 12/4=3" (25 fpm= 3") 100 fpm + 25 fpm = 12+3 = 15" sheave" "What are extension tubes used for? - CORRECT ANSWER Necessary clearance for placement of concrete forms." "If a hoist motor is making noise, what is the problem? - CORRECT ANSWER needs inductors" "What is the area of a 10" plunger? - CORRECT ANSWER Pie x radius squared = area 3.14x5x5= 78.5" "you are testing an elevator with a rated speed of 500 fpm. What is the minimum speed the safeties should be set at? - CORRECT ANSWER Mechanical : 115% x 500 = 575 fpm Electrical: 90% x 575 = 517.5 fpm" "What is the tolerance for 3/8 at .003? - CORRECT ANSWER 372-.378 bilateral=2 direction unilateral=1 direction" "you are installing the limit cam on the car and notice that the holes are not lining up. Where do you find the correct location for the cam? - CORRECT ANSWER The mechanical detail drawing." "you are on a call and find the pulley came off of the pump motor and the set screw is missing. What kind of screw would you use to replace it? - CORRECT ANSWER cup screw" "You are installing spring buffers on a 200 fpm car. what is the minimum buffer stroke? - CORRECT ANSWER 200 fpm = 4 inch note: 100 fpm = 1 1/2" note: 100-150 fpm = 2 1/2"" "What is the smallest wire used in a traveler? - CORRECT ANSWER 20 guage" "you are installing a single point hoist motor for rail installation and the capacity tag is partially missing. what do you do? - CORRECT ANSWER Remove the hoist from service." "What does a 4 in a red NFPA square represent? - CORRECT ANSWER Highly Flammable" "What does a 0 in a yellow NFPA square represent? - CORRECT ANSWER Reactivity (non-reactive)" "You are called to service a vvvf after the LOTO is performed, What is the first thing you do? - CORRECT ANSWER Check the capacitor" "What does an interpole do? - CORRECT ANSWER Reduce armature reaction" "What is the charge time on an RC network with 10 ohm resistor and a 500 microfarat capacitor? - CORRECT ANSWER 25" "They tell you they have a 12 volt circuit feeding a card bus, you're reading at the two arrows is 8.4 volts, what is the reading across the resistor? - CORRECT ANSWER 3.4 volts" "What is the main benefit of an RC circuit? - CORRECT ANSWER Arc suppression" "New Hydro installation, when one person rides the car it runs normal, When multiple people ride the car it wont run at all. What is the problem? - CORRECT ANSWER pressure relief is set too low" "You arrive at a service call that an elevator is stopping 4 inches too high for every floor in both directions. What is the issue? - CORRECT ANSWER bad magnetic switch" "You find the car has tripped the governor, upon closer inspection you find the governor seal is in tact. What is the issue? - CORRECT ANSWER weak shunt field" "you have a relay that wont pick and have determined there is nothing wrong with it electrically. what is most likely the problem? - CORRECT ANSWER Bad spring" "how much above and below rail joints do you file when filing rail joints? - CORRECT ANSWER 18"" "what is the weight of the counter weight and how can I figure it out? - CORRECT ANSWER weight of car plus 40% of capacity" "what is capacity of a car? - CORRECT ANSWER What it can safely hold" "what is the weight of the car? - CORRECT ANSWER nuts, bolts, flooring etc. gross weight of everything." "if you have a handrail that is 83' 5.5" long, the manufacturer needs that measurement in millimeters. What is it? - CORRECT ANSWER 83 x 12 = 996" 996 + 5.5 = 1,001.5 1,001.5 x 2.54= 2,543.81 millimeters" "If an SCR reads .735 is it good? - CORRECT ANSWER yes" "if you are working on a dumbwaiter, what must be done? - CORRECT ANSWER Power off, partially in, never fully get on top of a dumbwaiter" "scaffolding is to be inspected everyday, who is responsible? - CORRECT ANSWER competent person" "If a sleeve bearing on a 2 inch shaft gives out, what can you replace it with? - CORRECT ANSWER 2 inch roller bearing" "no refuge space in a residential elevator, what is the proper way to enter the pit? - CORRECT ANSWER Mechanical safety device"