1. A contractor wants to raise the car speed from 100fpm to 125fpm, it currently has a 12" sheave. What sheave is required? Answer: 100fpm / 125fpm = 12" / X= 15"
2. 2. A MOV (Metal Oxide Varistor) burns out. You replace it, but cannot read voltage or resistance. What should you do? Answer: Repl...
1. 1. A contractor wants to raise the car speed from 100fpm to 125fpm, it
currently has a 12" sheave. What sheave is required? Answer: 100fpm /
125fpm = 12" / X= 15"
2. 2. A MOV (Metal Oxide Varistor) burns out. You replace it, but cannot
read voltage or resistance. What should you do? Answer: Replace it with
a larger MOV 630
3. 3. On a Ward-Leonard circuit the break is set, but the motor is trying to
slip through the break. What is the issue? Answer: Suicide Circuit 425
4. 4. You have an old DC motor and are adding an SCR drive, what do you
do to the interpoles? Answer: Leave the interpoles alone. When adding a
SCR drive to the generator, the series loop is removed, as are the 3
resistors. Everything else remains the same.
5. 5. A hydro runs up with no load, but will not run with a full load. What is
the issue? Answer: The relief valve is set too low 815
6. 6. Runby for a 1 Answer: 1 hits the CWT buffer 4" below the top landing.
CWT runby should be set at 18". How much should the ropes be shortened?
Answer: 22" 235
7. 7. You need to work on a freight door retiring cam, you LOTO the main
line but there is still power on the cam. What circuit is still hot? Answer:
Door Operator Disconnect/ Main Line Disconnect 535
8. 8. The contractor requests that the vertical center of a Rack and Pinion
hoist be moved. How do you do this? Answer: Adjust Tie Downs and Wall
Ties 850
9. 9. Working pressure on a Hydro is 400psi. What is the maximum relief
valve setting? Answer: 400psi x 150%= 600psi 815
10.10. What must be installed on a false car before operation? Answer:
Spring Loaded Safeties 110
11.11. There is slight arcing between the brush and commutator. What
action must be taken? Answer: None
Note Answer: Heavy arcing=Light brush pressure, Heavy bush
pressure=mechanical wear 430
12.12. If rigging gear is roped 3 Answer: 1 and a BEAM CLAMP is used to lift
a 6,000lb load. What is the beam capacity requirement? Answer: 18,000lbs.
Note Answer: Beam capacity is cut in half with use of clamp, when
rigging all blocks, rope, and clamps will be Equal to the lowest load
rating 210
13. 13. How much resistance is measured over a normally closed switch?
Answer: -
1.2ohms. should be zero, but will never be that low
, Mike's Ultimate Mechanics Review
14.14. A car traveling in the hoistway always stops at the same spot and
blows a fuse. What causes this Answer: Traveling cable has a
cut/exposed wire or a short 515
15.15. How is a class 1 yearly buffer test preformed? Answer: Car at
bottom landing and on inspection, jump out direction and final limits.
With pit clear, run down to compress buffers, buffers should fully extend
within 90
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