Mechanics Exam Study Guide Questions and Complete Solutions Graded A+

how do you test a megger on an armature? - Answer: Disconnect power and ground to isolate armature. min resistance is 1 meg ohm. Come up to operating speed in the down and see heavy drag and it's hot. what's wrong? - Answer: partially shorted resistor and brake isn't picking all the way Customer complains doors open and immediately, why? - Answer: shorted resistor or bad capacitor when testing resistance on a parallel circuit, to avoid false reading you would? - Answer: remove one leg and test where would you find details of the elevator installation? - Answer: final layout what is the maximum degrees rise of an escalator? - Answer: 30 degrees what would you use to measure high amperage? - Answer: clamp-on meter what are directional limits used for? - Answer: limit in one direction only what is considered a fall hazard? - Answer: 6 ft or more how would you connect an ammeter - Answer: in series a disconnect is moved 30' and motor starts acting up, what should you do? - Answer: run larger gauge wire where would you find details of equipment ordered for the job - Answer: job abstract what is put in place so that the car cannot leave with the doors open - Answer: suicide circuit what is reverse phase? - Answer: a swapped leg how do you connect a voltmeter - Answer: in parallel how do you measure an escalator handrail? - Answer: return to return how do you use an ohmmeter? - Answer: with the power off and one leg removed. parallel across the load in a ward-leonard system, if all 3 contacts close what will happen? - Answer: the car will run at high speed if a rack and pinion hoist is not plumb, level, and square, what can happen? - Answer: hoist could go on safeties if a hoist motor is making noise, whats the problem? - Answer: bad inductors. inductors are used on the AC input to filter the notch effect describe escalator step level witch (sag switch) - Answer: it prevents a step that is sagging more than 1/8 inch is manually reset to allow the escalator to run. the escape hatch opens which way? - Answer: from the outside. prevents people from in the cab from opening it on their own a 12 stop building has 3 cars that needs PI's.3 floors doesn't need any. how many do you need to order? - Answer: 27 if you have an elevator that goes 1760 RPM at 60 hz what hz do we need it to go 600 RPM? - Answer: 20 Hz you get a sawtooth reading on an oscilloscope out of an encoder, is it good? - Answer: no, a good encoder wave will have a square wave. What is an ok substitute for a top rail of a barricade? - Answer: 1/4" wire rope how do you test incoming power? - Answer: L1 to L2 L1 to L3 L2 to L3 when replacing a circuit board in a controller, what should you do after the power is off? - Answer: wear a ground strap who gives you the right to a safe work environment? - Answer: OSHA how do you figure out what size transformer you need? - Answer: watt=volts x current you come to a confined space what level of training must you have to enter? - Answer: entrant elevators have many hazards which would you consider to be the most dangerous? - Answer: rotating equipment you are installing an elevator machine sheave. where would the machine and secondary be aligned? - Answer: center of rail measurement what is one of the most obvious danger you face in modernization and construction? - Answer: falls you are installing machines, governors , and generators and you