Complete Mechanics Examination Mastery With d d d d
Complete Solutions,A+ d d
** An MOV burns out, you replace it but cannot read voltage or resistance. What should you
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do? - CORRECT ANSWER✔✔Replace it with a larger one (630)
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* On a Ward-Leonard circuit, the brake is set but the motor is trying to slip through the brake.
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What circuit is the issue? - CORRECT ANSWER✔✔Suicide circuit (425)
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** A Hydro runs up with no load but does not run up with a full load. What is the issue? -
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CORRECT ANSWER✔✔The relief valve is set too low (805)
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** Runby for a 1:1 car hits the CWT buffer 4" below the top landing. The CWT runby should be
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set at 18". How much should the ropes be shortened? - CORRECT ANSWER✔✔22" for 1:1.
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For a 2:1 with the same issue is 44".
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** You need to work on a freight door retiring cam. You LOTO the mainline disconnect but
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there is still power to the cam. What circuit is still hot? - CORRECT ANSWER✔✔Mainline
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disconnect (535)
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** The contractor requests that the vertical center of the Rack and Pinion hoist be moved.
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How is this accomplished? - CORRECT ANSWER✔✔Adjust Tie downs/Wall ties (805)
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** Working pressure on a Hydro is 400 PSI. What is the correct Relief Valve Setting? -
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CORRECT ANSWER✔✔600 PSI Max. (805)
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400 psi x 150% = 600 psi
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** A contractor wants to raise the car speed from 100 FPM to 125 FPM. It currently has a 12"
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sheave. What size sheave is required? - CORRECT ANSWER✔✔15"
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(125 /100 = 1.25 1.25 x 12 = 15)
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** There is slight arcing at the Brushes and Commutator. What actions must be taken? -
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CORRECT ANSWER✔✔None. (430)
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"Heavy arcing is due to light brush pressure. Mechanical wear indicates heavy brush
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pressure.
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** How much resistance is normally measured across a normally closed switch ? -
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CORRECT ANSWER✔✔1.2 ohms or 1 to 2 ohms
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, ** A car traveling in the hoistway always stops at the same point and blows a fuse. What is the
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problem? - CORRECT ANSWER✔✔Traveling cable has a cut or short
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** How is a Class 1 (yearly) buffer test performed? - CORRECT ANSWER✔✔At slow speed
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and the buffer must return in 90 seconds. (555) *(60 seconds is acceptable) (90 seconds is
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code)
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5 year test (Class 5) is car at rated load and speed. Buffer must return in 90 seconds. CWT at
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rated speed and buffer must return in 90 seconds.
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** How many Strain Supports are required on a 350' raceway? - CORRECT ANSWER✔✔4
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One for every 100' d d d
** How is Stainless steel drilled out? - CORRECT ANSWER✔✔Slow speed and constant
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pressure (205)
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** What are the required amount of clips for Wedge Shackles and what is their spacing? -
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CORRECT ANSWER✔✔At least 2, with the first being 4 times the diameter of the rope from
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the top of shackle.
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Second is 8 times the diameter of the rope from the first. d d d d d d d d d d d
** Car is loaded with 125% and sinks. Why? - CORRECT ANSWER✔✔Slipped through the
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brake.
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** A 300 Ohm resistor burns out. You don't have a 300 Ohm resistor to replace it. What can
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you use to make up the resistor? - CORRECT ANSWER✔✔2 600 Ohms resistors in
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Parallel. "The resistance is half of the highest rating in a parallel circuit.
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3, 225 Ohm resistors in parallel equal 75 Ohms.
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** A 480 VAC Step Down Transformer is connected to a 3 phase rectifier. What will the
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output be? - CORRECT ANSWER✔✔320 VDC
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480 - 33.33% = 320 d d d d
** If you find a broken or missing barricade, what do you do? - CORRECT
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ANSWER✔✔Write up a formal inspection request.
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** If a Dumbwaiter has 9 square feet in Area,
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4 ' High and the rated Capacity is 13.9 lb/ft3, what is the total capacity? - CORRECT
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ANSWER✔✔500 lb/ft3.
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"The area of a Dumbwaiter is 9 sq' max and is 4' High. Multiply that by 13.9.
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9x4 = 36. 36 x 13.9 = 500
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** What are the consequences of a misaligned Rack and Pinion hoist joint? - CORRECT
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ANSWER✔✔Broken Gear Teeth (850) Motor not aligned.
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Complete Solutions,A+ d d
** An MOV burns out, you replace it but cannot read voltage or resistance. What should you
d d d d d d d d d d d d d d d d
do? - CORRECT ANSWER✔✔Replace it with a larger one (630)
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* On a Ward-Leonard circuit, the brake is set but the motor is trying to slip through the brake.
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What circuit is the issue? - CORRECT ANSWER✔✔Suicide circuit (425)
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** A Hydro runs up with no load but does not run up with a full load. What is the issue? -
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CORRECT ANSWER✔✔The relief valve is set too low (805)
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** Runby for a 1:1 car hits the CWT buffer 4" below the top landing. The CWT runby should be
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set at 18". How much should the ropes be shortened? - CORRECT ANSWER✔✔22" for 1:1.
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d
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For a 2:1 with the same issue is 44".
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** You need to work on a freight door retiring cam. You LOTO the mainline disconnect but
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there is still power to the cam. What circuit is still hot? - CORRECT ANSWER✔✔Mainline
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disconnect (535)
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** The contractor requests that the vertical center of the Rack and Pinion hoist be moved.
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How is this accomplished? - CORRECT ANSWER✔✔Adjust Tie downs/Wall ties (805)
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** Working pressure on a Hydro is 400 PSI. What is the correct Relief Valve Setting? -
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CORRECT ANSWER✔✔600 PSI Max. (805)
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400 psi x 150% = 600 psi
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** A contractor wants to raise the car speed from 100 FPM to 125 FPM. It currently has a 12"
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sheave. What size sheave is required? - CORRECT ANSWER✔✔15"
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(125 /100 = 1.25 1.25 x 12 = 15)
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** There is slight arcing at the Brushes and Commutator. What actions must be taken? -
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CORRECT ANSWER✔✔None. (430)
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"Heavy arcing is due to light brush pressure. Mechanical wear indicates heavy brush
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pressure.
d
** How much resistance is normally measured across a normally closed switch ? -
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CORRECT ANSWER✔✔1.2 ohms or 1 to 2 ohms
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, ** A car traveling in the hoistway always stops at the same point and blows a fuse. What is the
d d d d d d d d d d d d d d d d d d d
problem? - CORRECT ANSWER✔✔Traveling cable has a cut or short
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** How is a Class 1 (yearly) buffer test performed? - CORRECT ANSWER✔✔At slow speed
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and the buffer must return in 90 seconds. (555) *(60 seconds is acceptable) (90 seconds is
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code)
d
5 year test (Class 5) is car at rated load and speed. Buffer must return in 90 seconds. CWT at
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rated speed and buffer must return in 90 seconds.
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** How many Strain Supports are required on a 350' raceway? - CORRECT ANSWER✔✔4
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One for every 100' d d d
** How is Stainless steel drilled out? - CORRECT ANSWER✔✔Slow speed and constant
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pressure (205)
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** What are the required amount of clips for Wedge Shackles and what is their spacing? -
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CORRECT ANSWER✔✔At least 2, with the first being 4 times the diameter of the rope from
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the top of shackle.
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Second is 8 times the diameter of the rope from the first. d d d d d d d d d d d
** Car is loaded with 125% and sinks. Why? - CORRECT ANSWER✔✔Slipped through the
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brake.
d
** A 300 Ohm resistor burns out. You don't have a 300 Ohm resistor to replace it. What can
d d d d d d d d d d d d d d d d d d
you use to make up the resistor? - CORRECT ANSWER✔✔2 600 Ohms resistors in
d d d d d d d d d d d d d d
Parallel. "The resistance is half of the highest rating in a parallel circuit.
d d d d d d d d d d d d d d
3, 225 Ohm resistors in parallel equal 75 Ohms.
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** A 480 VAC Step Down Transformer is connected to a 3 phase rectifier. What will the
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output be? - CORRECT ANSWER✔✔320 VDC
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480 - 33.33% = 320 d d d d
** If you find a broken or missing barricade, what do you do? - CORRECT
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ANSWER✔✔Write up a formal inspection request.
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** If a Dumbwaiter has 9 square feet in Area,
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4 ' High and the rated Capacity is 13.9 lb/ft3, what is the total capacity? - CORRECT
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ANSWER✔✔500 lb/ft3.
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"The area of a Dumbwaiter is 9 sq' max and is 4' High. Multiply that by 13.9.
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9x4 = 36. 36 x 13.9 = 500
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** What are the consequences of a misaligned Rack and Pinion hoist joint? - CORRECT
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ANSWER✔✔Broken Gear Teeth (850) Motor not aligned.
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