Mechanics Exam Questions And Answers Graded A+ 2024.
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Course
Mechanics
Institution
Mechanics
Mechanics Exam Questions And Answers Graded A+ 2024.
** 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 sli...
Mechanics Exam Questions And Answers
Graded A+ 2024.
** 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'
** How is Stainless steel drilled out? - correct answer. Slow speed and constant
pressure (205)
** What are the required amount of clips for Wedge Shackles and what is their spacing?
- correct 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? - correct 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? - correct 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? - correct answer. 320 VDC
480 - 33.33% = 320
** If you find a broken or missing barricade, what do you do? - correct answer. Write
up a formal inspection request.
** If a Dumbwaiter has 9 square feet in Area,
4 ' High and the rated Capacity is 13.9 lb/ft3, what is the total capacity? - correct
answer. 500 lb/ft3.
"The area of a Dumbwaiter is 9 sq' max and is 4' High. Multiply that by 13.9.
9x4 = 36. 36 x 13.9 = 500
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