Mechanic Final Exam 2022-2023
E=__ - answer IR
P=__ - answer IE
Pie r^2 = - answer Area of a circle
231 in^3 /____ - answer gal.
25.4mm/__ - answer in.
2.2kg/ - answer lb
3 phase rectifier output = - answer 1.33 x input
single phase output = - answer 0.9 x input
RMS (effective voltage) = - answer 0.707 (PEAK V)
TC = - answer R x C (5)???
RPM = - answer 60 (frequency) / (poles/2)
door overlap minimum = - answer 5/8" min
door gaps maximum = - answer 3/8" max
Gibs minimum = - answer 1/4" min
Gate Switch maximum = - answer 2"
Passenger Sill to Sill ____ to ______" - answer 1/2 to 1-1/2"
Platform Lift Sill ____ to _____" - answer 3/8" to 3/4"
Moving Walk maximum = - answer 12 degree max
Governors (Car Trip Speed =______ & Overspeed Switch =______) - answer Car trip speed 15-20% greater than
contract speed.
Overspeed Switch less than or equal to 90-95% of trip speed
CWT (____%) - answer Up to 10% greater than car trip speed
1) A contractor wants to raise the car speed from 100FPM to 125FPM. It currently has a 12" sheave. What size
sheave is required? - answer 15"
----Diam = 12, 12"/4=3, 25FPM=3in : 100FPM + 25FPM = 12"+3" =15"
2) An MOV (metal oxide varistor) burns out. You should replace it, but cannot read the Voltage or resistance.
What should you do? - answer Replace it with a larger MOV. (630)
3) On a Ward-Leonard circuit, the brake is set, but the motor is trying to slip through the break. What circuit is
the issue? - answer Suicide Circuit. (425)
, 4) You have an old DC motor and you are adding an SCR Drive. What do you do with the interpoles? - answer
Leave the interpoles alone. (425).
NOTE: When adding the SCR Drive to the generator, the series loop is removed, as are the 3 resistors.
Everything else stays the same.
5) A hydro runs up with no load, but does not run up with a full load. What is the issue? - answer The relief
valve is set too low. (805).
6) 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? - answer 22" and for a 2:1 with the same issue --> 44"
7) 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? - answer Mainline disconnect. (535) (3.2.6)
8) The contractor requests that the vertical center of the rack and pinion hoist be moved. How is this
accomplished? - answer Adjust tie downs/ wall ties (850).
9) Working pressure on a Hydro is a 400 psi. What is the correct relief valve setting? - answer 600 psi max.
(805), 400psi x 150% = 600psi
10) What must first be installed on a false car before operation? - answer Safeties (110) note: handrails &
buffers also required
11) There is a slight arcing at the brush and commutator. What actions must be taken? - answer None. (430)
Note: Heavy arcing due to light brush pressure, mechanical wear indicates heavy brush pressure.
12) If rigging gear is roped 3:1 and a beam clamp is used to lift a 6000 lb load. What is the beam capacity
requirement? - answer 18000 lb. (210). note: When rigging all blocks, rope, and clamps will be EQUAL to the
lowest load rating capacity.
13) How much resistance is normally measured across a normally closed switch? - answer 1.2 ohms
14) A car traveling in the hoistway always stops at the same point and blows a fuse. What is the problem? -
answer Traveling cable has a cut or short.
15) How is a class I (yearly) buffer test performed? - answer At slow speed and the buffer must return in 60 sec.
(555)
NOTE: 5 yr Test (class 5) for car is rated load and speed and buffer returns in 90 sec., CWT is empty car at rated
speed and buffer must return in 90 sec.
16) How many strain supports are required on a 350 foot raceway? - answer 4, 1 for every 100ft.
17) How is stainless steel drilled out? - answer Slow speed constant pressure (205)
18) What are the required amounts of clips required for wedge shackles and what is their spacings? - answer At
least 2, with the first being 4 times the diameter of the rope from the top of shackle max and the second 8
times the diameter of the rope from the first.
19) A 300ohm resistor burns out. You don't have a 300ohm resistor. What can you use to make up the resistor?
- answer TWO 600ohm resistors in parallel, (600) the resistance is the half of the highest rating in a parallel
circuit. As is THREE 225ohm resistorsin parallel equal 75ohms.
20) When cutting laminated panels, which direction should the finished side face? - answer Finished face of
the material should face the cutting edge of the tool (255). The blade has a tendency to burr the back side.
E=__ - answer IR
P=__ - answer IE
Pie r^2 = - answer Area of a circle
231 in^3 /____ - answer gal.
25.4mm/__ - answer in.
2.2kg/ - answer lb
3 phase rectifier output = - answer 1.33 x input
single phase output = - answer 0.9 x input
RMS (effective voltage) = - answer 0.707 (PEAK V)
TC = - answer R x C (5)???
RPM = - answer 60 (frequency) / (poles/2)
door overlap minimum = - answer 5/8" min
door gaps maximum = - answer 3/8" max
Gibs minimum = - answer 1/4" min
Gate Switch maximum = - answer 2"
Passenger Sill to Sill ____ to ______" - answer 1/2 to 1-1/2"
Platform Lift Sill ____ to _____" - answer 3/8" to 3/4"
Moving Walk maximum = - answer 12 degree max
Governors (Car Trip Speed =______ & Overspeed Switch =______) - answer Car trip speed 15-20% greater than
contract speed.
Overspeed Switch less than or equal to 90-95% of trip speed
CWT (____%) - answer Up to 10% greater than car trip speed
1) A contractor wants to raise the car speed from 100FPM to 125FPM. It currently has a 12" sheave. What size
sheave is required? - answer 15"
----Diam = 12, 12"/4=3, 25FPM=3in : 100FPM + 25FPM = 12"+3" =15"
2) An MOV (metal oxide varistor) burns out. You should replace it, but cannot read the Voltage or resistance.
What should you do? - answer Replace it with a larger MOV. (630)
3) On a Ward-Leonard circuit, the brake is set, but the motor is trying to slip through the break. What circuit is
the issue? - answer Suicide Circuit. (425)
, 4) You have an old DC motor and you are adding an SCR Drive. What do you do with the interpoles? - answer
Leave the interpoles alone. (425).
NOTE: When adding the SCR Drive to the generator, the series loop is removed, as are the 3 resistors.
Everything else stays the same.
5) A hydro runs up with no load, but does not run up with a full load. What is the issue? - answer The relief
valve is set too low. (805).
6) 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? - answer 22" and for a 2:1 with the same issue --> 44"
7) 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? - answer Mainline disconnect. (535) (3.2.6)
8) The contractor requests that the vertical center of the rack and pinion hoist be moved. How is this
accomplished? - answer Adjust tie downs/ wall ties (850).
9) Working pressure on a Hydro is a 400 psi. What is the correct relief valve setting? - answer 600 psi max.
(805), 400psi x 150% = 600psi
10) What must first be installed on a false car before operation? - answer Safeties (110) note: handrails &
buffers also required
11) There is a slight arcing at the brush and commutator. What actions must be taken? - answer None. (430)
Note: Heavy arcing due to light brush pressure, mechanical wear indicates heavy brush pressure.
12) If rigging gear is roped 3:1 and a beam clamp is used to lift a 6000 lb load. What is the beam capacity
requirement? - answer 18000 lb. (210). note: When rigging all blocks, rope, and clamps will be EQUAL to the
lowest load rating capacity.
13) How much resistance is normally measured across a normally closed switch? - answer 1.2 ohms
14) A car traveling in the hoistway always stops at the same point and blows a fuse. What is the problem? -
answer Traveling cable has a cut or short.
15) How is a class I (yearly) buffer test performed? - answer At slow speed and the buffer must return in 60 sec.
(555)
NOTE: 5 yr Test (class 5) for car is rated load and speed and buffer returns in 90 sec., CWT is empty car at rated
speed and buffer must return in 90 sec.
16) How many strain supports are required on a 350 foot raceway? - answer 4, 1 for every 100ft.
17) How is stainless steel drilled out? - answer Slow speed constant pressure (205)
18) What are the required amounts of clips required for wedge shackles and what is their spacings? - answer At
least 2, with the first being 4 times the diameter of the rope from the top of shackle max and the second 8
times the diameter of the rope from the first.
19) A 300ohm resistor burns out. You don't have a 300ohm resistor. What can you use to make up the resistor?
- answer TWO 600ohm resistors in parallel, (600) the resistance is the half of the highest rating in a parallel
circuit. As is THREE 225ohm resistorsin parallel equal 75ohms.
20) When cutting laminated panels, which direction should the finished side face? - answer Finished face of
the material should face the cutting edge of the tool (255). The blade has a tendency to burr the back side.
