** An MOV burns out, you replace it but cannot read voltage or resistance. What should you do? Correct Answer: Replace it with a larger one (630)
* On a Ward-Leonard circuit, the brake is set but the motor is trying
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** An MOV burns out, you replace it but cannot read voltage or resistance. What should you do? Correct Answer: 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? Correct Answer: Suicide circuit (425)
** A Hydro runs up with no load but does not run up with a full load. What is the issue? Correct Answer: 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? Correct Answer: 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? Correct Answer: Mainline disconnect (535)
** The contractor requests that the vertical center of the Rack and Pinion hoist be moved. How is this accomplished? Correct Answer: Adjust Tie downs/Wall ties (805)
** Working pressure on a Hydro is 400 PSI. What is the correct Relief Valve Setting? Correct Answer: 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? Correct Answer: 15"
(125 /100 = 1.25 1.25 x 12 = 15)
** There is slight arcing at the Brushes and Commutator. What actions must be taken? Correct Answer: 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 ? Correct Answer: 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? Correct Answer: Traveling cable has a cut or short
** How is a Class 1 (yearly) buffer test performed? Correct Answer: 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? Correct Answer: 4
One for every 100'
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