Mechanics Exam Study Guide with Complete Solutions 2023 ** 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 1 / 2
** 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)
- year test (Class 5) is car at rated load and speed. Buffer must return in 90 seconds.
- Correct Answer At least 2, with the first being 4 times the diameter of the rope from the
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?
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,
- ' High and the rated Capacity is 13.9 lb/ft3, what is the total capacity? - Correct
- / 2
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 ** What are the consequences of a misaligned Rack and Pinion hoist joint? - Correct Answer Broken Gear Teeth (850) Motor not aligned.** You enter a Pit where toxic fumes are present. How do you proceed? - Correct Answer Follow proper procedures."Confined Space entry procedures are now guided by OSHA for pit entry".