Mechanics Exam2024/Questions and
Correct Answers/A+ Graded
** 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.
-** A 480 VAC Step Down Transformer is connected to a 3 phase rectifier. What will the
output be? - -320 VDC
480 - 33.33% = 320
-** If you find a broken or missing barricade, what do you do? - -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? - -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? - -Broken
Gear Teeth (850) Motor not aligned.
-** You enter a Pit where toxic fumes are present. How do you proceed? - -Follow proper
procedures.
"Confined Space entry procedures are now guided by OSHA for pit entry".
-** When changing a 1:1 car rated at 600 FPM and 2000 lb capacity to a 2:1, what will
the new ratings be? - -300 FPM and 4000 lb capacity.
"Halves the speed and doubles the capacity ".
-** A "Vertical" platform lift has a clearance of 1". How much will it need to be moved to
meet code? - -Deduct 1/4".
( 3/4" ) is needed.
-** A car weighs 2500 lbs with a capacity of 2500 lbs. The CWT is weighed at 40%. How
much is the motor lifting at 100% load? - -1500 lbs
2500 x .40 = 1000 lbs
Correct Answers/A+ Graded
** 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.
-** A 480 VAC Step Down Transformer is connected to a 3 phase rectifier. What will the
output be? - -320 VDC
480 - 33.33% = 320
-** If you find a broken or missing barricade, what do you do? - -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? - -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? - -Broken
Gear Teeth (850) Motor not aligned.
-** You enter a Pit where toxic fumes are present. How do you proceed? - -Follow proper
procedures.
"Confined Space entry procedures are now guided by OSHA for pit entry".
-** When changing a 1:1 car rated at 600 FPM and 2000 lb capacity to a 2:1, what will
the new ratings be? - -300 FPM and 4000 lb capacity.
"Halves the speed and doubles the capacity ".
-** A "Vertical" platform lift has a clearance of 1". How much will it need to be moved to
meet code? - -Deduct 1/4".
( 3/4" ) is needed.
-** A car weighs 2500 lbs with a capacity of 2500 lbs. The CWT is weighed at 40%. How
much is the motor lifting at 100% load? - -1500 lbs
2500 x .40 = 1000 lbs
