Mechanic Exam 2024/Latest Update/123
Questions with well Analyzed
Answers/Verified
E=__ - -IR
-P=__ - -IE
-Pie r^2 = - -Area of a circle
-231 in^3 /____ - -gal.
-25.4mm/__ - -in.
-2.2kg/ - -lb
-3 phase rectifier output = - -1.33 x input
-single phase output = - -0.9 x input
-RMS (effective voltage) = - -0.707 (PEAK V)
-TC = - -R x C (5)???
-RPM = - -60 (frequency) / (poles/2)
-door overlap minimum = - -5/8" min
-door gaps maximum = - -3/8" max
-Gibs minimum = - -1/4" min
-Gate Switch maximum = - -2"
-Passenger Sill to Sill ____ to ______" - -1/2 to 1-1/2"
-Platform Lift Sill ____ to _____" - -3/8" to 3/4"
-Moving Walk maximum = - -12 degree max
-Governors (Car Trip Speed =______ & Overspeed Switch =______) - -Car trip speed 15-
20% greater than contract speed.
Overspeed Switch less than or equal to 90-95% of trip speed
-CWT (____%) - -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? - -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? - -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? - -Suicide Circuit. (425)
-4) You have an old DC motor and you are adding an SCR Drive. What do you do with
the interpoles? - -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? -
-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? - -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? - -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? - -Adjust tie downs/ wall ties (850).
-9) Working pressure on a Hydro is a 400 psi. What is the correct relief valve setting? - -
600 psi max. (805), 400psi x 150% = 600psi
-10) What must first be installed on a false car before operation? - -Safeties (110) note:
handrails & buffers also required
-11) There is a slight arcing at the brush and commutator. What actions must be taken? - -
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? - -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? - -1.2
ohms
-14) 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.
Questions with well Analyzed
Answers/Verified
E=__ - -IR
-P=__ - -IE
-Pie r^2 = - -Area of a circle
-231 in^3 /____ - -gal.
-25.4mm/__ - -in.
-2.2kg/ - -lb
-3 phase rectifier output = - -1.33 x input
-single phase output = - -0.9 x input
-RMS (effective voltage) = - -0.707 (PEAK V)
-TC = - -R x C (5)???
-RPM = - -60 (frequency) / (poles/2)
-door overlap minimum = - -5/8" min
-door gaps maximum = - -3/8" max
-Gibs minimum = - -1/4" min
-Gate Switch maximum = - -2"
-Passenger Sill to Sill ____ to ______" - -1/2 to 1-1/2"
-Platform Lift Sill ____ to _____" - -3/8" to 3/4"
-Moving Walk maximum = - -12 degree max
-Governors (Car Trip Speed =______ & Overspeed Switch =______) - -Car trip speed 15-
20% greater than contract speed.
Overspeed Switch less than or equal to 90-95% of trip speed
-CWT (____%) - -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? - -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? - -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? - -Suicide Circuit. (425)
-4) You have an old DC motor and you are adding an SCR Drive. What do you do with
the interpoles? - -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? -
-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? - -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? - -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? - -Adjust tie downs/ wall ties (850).
-9) Working pressure on a Hydro is a 400 psi. What is the correct relief valve setting? - -
600 psi max. (805), 400psi x 150% = 600psi
-10) What must first be installed on a false car before operation? - -Safeties (110) note:
handrails & buffers also required
-11) There is a slight arcing at the brush and commutator. What actions must be taken? - -
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? - -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? - -1.2
ohms
-14) 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.
