Mechanics Exam Questions & Answers |
100% Correct Answers | Verified | Latest
2024 Version
** An MOV burns out, you replace it but cannot read voltage or resistance. What should you do? -
✔✔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? - ✔✔Suicide circuit (425)
** A Hydro runs up with no load but does not run up with a full load. What is the issue? - ✔✔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? - ✔✔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? - ✔✔Mainline disconnect (535)
** The contractor requests that the vertical center of the Rack and Pinion hoist be moved. How is this
accomplished? - ✔✔Adjust Tie downs/Wall ties (805)
** Working pressure on a Hydro is 400 PSI. What is the correct Relief Valve Setting? - ✔✔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? - ✔✔15"
(125 /100 = 1.25 1.25 x 12 = 15)
, ** There is slight arcing at the Brushes and Commutator. What actions must be taken? - ✔✔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 ? - ✔✔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?
- ✔✔Traveling cable has a cut or short
** How is a Class 1 (yearly) buffer test performed? - ✔✔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? - ✔✔4
One for every 100'
** How is Stainless steel drilled out? - ✔✔Slow speed and constant pressure (205)
** What are the required amount of clips for Wedge Shackles and what is their spacing? - ✔✔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? - ✔✔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? - ✔✔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.
100% Correct Answers | Verified | Latest
2024 Version
** An MOV burns out, you replace it but cannot read voltage or resistance. What should you do? -
✔✔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? - ✔✔Suicide circuit (425)
** A Hydro runs up with no load but does not run up with a full load. What is the issue? - ✔✔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? - ✔✔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? - ✔✔Mainline disconnect (535)
** The contractor requests that the vertical center of the Rack and Pinion hoist be moved. How is this
accomplished? - ✔✔Adjust Tie downs/Wall ties (805)
** Working pressure on a Hydro is 400 PSI. What is the correct Relief Valve Setting? - ✔✔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? - ✔✔15"
(125 /100 = 1.25 1.25 x 12 = 15)
, ** There is slight arcing at the Brushes and Commutator. What actions must be taken? - ✔✔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 ? - ✔✔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?
- ✔✔Traveling cable has a cut or short
** How is a Class 1 (yearly) buffer test performed? - ✔✔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? - ✔✔4
One for every 100'
** How is Stainless steel drilled out? - ✔✔Slow speed and constant pressure (205)
** What are the required amount of clips for Wedge Shackles and what is their spacing? - ✔✔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? - ✔✔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? - ✔✔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.
