Mechanics Final Exam Questions With Correct Answers (100% verified) Latest 2023/2024

Mechanics Final Exam Questions With Correct Answers (100% verified) Latest 2023/2024. An MOV burns out, you replace it but cannot read voltage or resistance. What should you do? Ans Replace it with a larger one (630) * On a Ward-Leonard circuit, the brake is set but the motor is trying to slip through the brake. What circuit is the issue? Ans Suicide circuit (425) ** A Hydro runs up with no load but does not run up with a full load. What is the issue? Ans The relief valve is set too low (805) ** Runby for a 1:1 car hits the CWT buffer 4" below the top landing. The CWT runby should be set at 18". How much should the ropes be shortened? Ans 22" for 1:1. For a 2:1 with the same issue is 44". ** You need to work on a freight door retiring cam. You LOTO the mainline disconnect but there is still power to the cam. What circuit is still hot? Ans Mainline disconnect (535) ** The contractor requests that the vertical center of the Rack and Pinion hoist be moved. How is this accomplished? Ans Adjust Tie downs/Wall ties (805) ** Working pressure on a Hydro is 400 PSI. What is the correct Relief Valve Setting? Ans 600 PSI Max. (805) 400 psi x 150% = 600 psi ** 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? Ans 15" (125 /100 = 1.25 1.25 x 12 = 15) ** There is slight arcing at the Brushes and Commutator. What actions must be taken? Ans None. (430) "Heavy arcing is due to light brush pressure. Mechanical wear indicates heavy brush pressure. ** How much resistance is normally measured across a normally closed switch ? Ans 1.2 ohms or 1 to 2 ohms ** A car traveling in the hoistway always stops at the same point and blows a fuse. What is the problem? Ans Traveling cable has a cut or short ** How is a Class 1 (yearly) buffer test performed? Ans At slow speed and the buffer must return in 90 seconds. (555) *(60 seconds is acceptable) (90 seconds is code) 5 year test (Class 5) is car at rated load and speed. Buffer must return in 90 seconds. CWT at rated speed and buffer must return in 90 seconds. ** How many Strain Supports are required on a 350' raceway? Ans 4 One for every 100' ** How is Stainless steel drilled out? Ans Slow speed and constant pressure (205) ** What are the required amount of clips for Wedge Shackles and what is their spacing? Ans At least 2, with the first being 4 times the diameter of the rope from the top of shackle. Second is 8 times the diameter of the rope from the first. ** Car is loaded with 125% and sinks. Why? Ans Slipped through the brake. ** A 300 Ohm resistor burns out. You don't have a 300 Ohm resistor to replace it. What can you use to make up the resistor? Ans 2 600 Ohms resistors in Parallel. "The resistance is half of the highest rating in a parallel circuit. 3, 225 Ohm resistors in parallel equal 75 Ohms. ** A 480 VAC Step Down Transformer is connected to a 3 phase rectifier. What will the output be? Ans 320 VDC 480 - 33.33% = 320 ** If you find a broken or missing barricade, what do you do? Ans Write up a formal inspection request. ** If a Dumbwaiter has 9 square feet in Area, 4 ' High and the rated Capacity is 13.9 lb/ft3, what is the total capacity? Ans 500 lb/ft3. "The area of a Dumbwaiter is 9 sq' max and is 4' High. Multiply that by 13.9. 9x4 = 36. 36 x 13.9 = 500 ** What are the consequences of a misaligned Rack and Pinion hoist joint? Ans Broken Gear Teeth (850) Motor not aligned. ** You enter a Pit where toxic fumes are present. How do you proceed? Ans Follow proper procedures. "Confined Space entry procedures are now guided by OSHA for pit entry". ** When changing a 1:1 car rated at 600 FPM and 2000 lb capacity to a 2:1, what will the new ratings be? Ans 300 FPM and 4000 lb capacity. "Halves the speed and doubles the capacity ". ** A "Vertical" platform lift has a clearance of 1". How much will it need to be moved to meet code? Ans Deduct 1/4". ( 3/4" ) is needed. ** A car weighs 2500 lbs with a capacity of 2500 lbs. The CWT is weighed at 40%. How much is the motor lifting at 100% load? Ans 1500 lbs 2500 x .40 = 1000 lbs 2500 + 1000 = 3500 lbs = 1500 lbs ** When drilling a Jack Hole in sandy conditions, what type of drill rig is required? Ans Rotary or Auger bit (805) Rotary = Compacted soil Percussion = Rocky conditions Percussion Rotary = Solid rock ** A customer does not want an Escape Hatch on his residential elevator. Under what conditions is this legal? Ans Manual Operation must be provided (850) ** You wired the Down Direction and Final Limit switches. Now the car only runs up. What is the problem? Ans You wired the Down Direction Limit wrong. ** What are the effects of one rope sitting deeper in the sheave groove? Ans The rope wears out and breaks faster (250) ** There is a noise coming from a freight door. The sheave is moving but the chain is not. What is the problem? Ans Oil on on the chain ** What is the effect when you change a sling angle from 60* to 30* when hoisting and rigging? Ans More tension, less capacity. ** How many points of contact must be maintained on a ladder? Ans 3 points at all time. * What is the conversion formula when measuring Inch to MM? Ans 25.4 Inch to MM (.03937) 2.54 Inch to CM (.3937) ** You open a Dumbwaiter access panel and it still runs. What is the cause? Ans Pit Access switch is not working. (550) ** You perform a static load test with the pit valve in the closed position. The car sinks 6" in 15 minutes. What is the cause? Ans Cylinder leak (520) ** Where should you point the fire extinguisher when putting out a fire? Ans At the base of the fire ** A car with a "Selective Collective" controller is moving to the lobby to pick up a call. An up call is put in at the second floor. What happens? Ans Call is bypassed till the car is moving in the up direction. ** During construction, you land an escalator but it is 10mm to low. What is wrong? Ans Pit is too deep or Column Mark is off. (825) ** During construction, the Omega CWT rails have been damaged. Why? Ans Overtightened from rail bracket. (215) ** How do you attach brackets to brick/concrete blocks? Ans "Inserts" 1/4" back from brick/concrete blocks ** Given a generator that runs at 600 rpm and has 4 Poles, what is the output frequency? Ans 600/60seconds = 10x2 = 20 HZ ** If an Exclusive OR gate was connected to a NOR gate and attached to a AND gate with a high out put, what must the input at the Exclusive OR gate A and B be? Ans Both must be high ** Using Binary logic, what DIP switches need to be in the " On" position of a 128 bit 30 second timer set for 150%? Ans 1,3,4,6 = 45 ** How must a 9 lead 480/240 motor be wired for low voltage setting? Ans L1 (1,7). L2 (2,8). L3 (3,9). (4,5,6)