MECHANICS EXAM QUESTIONS AND
ANSWERS 100% CORRECT!!
, ** An MOV burns out, you replace it but cannot read voltage or resistance. What should
you do? - 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? - ANSWER Suicide circuit (425)
** A Hydro runs up with no load but does not run up with a full load. What is the issue? -
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? - 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? - ANSWER Mainline
disconnect (535)
** The contractor requests that the vertical center of the Rack and Pinion hoist be
moved. How is this accomplished? - ANSWER Adjust Tie downs/Wall ties (805)
** Working pressure on a Hydro is 400 PSI. What is the correct Relief Valve Setting? -
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? - 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? -
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 ? -
ANSWER 1.2 ohms or 1 to 2 ohms
ANSWERS 100% CORRECT!!
, ** An MOV burns out, you replace it but cannot read voltage or resistance. What should
you do? - 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? - ANSWER Suicide circuit (425)
** A Hydro runs up with no load but does not run up with a full load. What is the issue? -
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? - 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? - ANSWER Mainline
disconnect (535)
** The contractor requests that the vertical center of the Rack and Pinion hoist be
moved. How is this accomplished? - ANSWER Adjust Tie downs/Wall ties (805)
** Working pressure on a Hydro is 400 PSI. What is the correct Relief Valve Setting? -
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? - 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? -
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 ? -
ANSWER 1.2 ohms or 1 to 2 ohms
