Mechanics Exam Questions with correct
answers
** 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
** A car traveling in the hoistway always stops at the same point and blows a fuse. What
is the problem? - ANSWER-Traveling cable has a cut or short
** How is a Class 1 (yearly) buffer test performed? - 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? - ANSWER-4
One for every 100'
** How is Stainless steel drilled out? - ANSWER-Slow speed and constant pressure
(205)
** What are the required amount of clips for Wedge Shackles and what is their spacing?
- ANSWER-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? - ANSWER-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? - ANSWER-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? - ANSWER-320 VDC
480 - 33.33% = 320
** If you find a broken or missing barricade, what do you do? - ANSWER-Write up a
formal inspection request.
** If a Dumbwaiter has 9 square feet in Area,
answers
** 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
** A car traveling in the hoistway always stops at the same point and blows a fuse. What
is the problem? - ANSWER-Traveling cable has a cut or short
** How is a Class 1 (yearly) buffer test performed? - 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? - ANSWER-4
One for every 100'
** How is Stainless steel drilled out? - ANSWER-Slow speed and constant pressure
(205)
** What are the required amount of clips for Wedge Shackles and what is their spacing?
- ANSWER-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? - ANSWER-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? - ANSWER-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? - ANSWER-320 VDC
480 - 33.33% = 320
** If you find a broken or missing barricade, what do you do? - ANSWER-Write up a
formal inspection request.
** If a Dumbwaiter has 9 square feet in Area,
