Questions with 100% Correct Answers –
COMPLETE SOLUTION
1. A contractor wants to raise the car speed from 100fpm to 125fpm, it cur-
rently has a 12" sheave. What sheave is required?ANS: Diam=12" 12/4=3"
25fpm=3" 100fpm + 25fpm= 12"+3"= 15" sheave
2. A MOV (Metal Oxide Varistor) burns out. You replace it, but cannot read
voltage or resistance. What should you do? ANS: Replace it with a larger
MOV
3. On a Ward-Leonard circuit the break is set, but the motor is trying to slip
through the break. What is the issue? ANS: Suicide Circuit
4. You have an old DC motor and are adding an SCR drive, what do you do
to the interpoles? ANS: 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. A hydro runs up with no load, but will not run with a full load. What is the
issue? ANS: The relief valve is set too low
,6. Runby for a 1:1 hits the CWT buffer 4" below the top landing. CWT runby
should be set at 18". How much should the ropes be shortened? ANS: 22"
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? ANS: Door
Operator Disconnect/ Main Line Disconnect
8. The contractor requests that the vertical center of a Rack and Pinion hoist
be moved. How do you do this? ANS: Adjust Tie Downs and Wall Ties
9. Working pressure on a Hydro is 400psi. What is the maximum relief valve
setting? ANS: 400psi x 150%= 600psi
10. What must be installed on a false car before operation? ANS: Spring
Loaded Safeties.
11. There is slight arcing between the brush and commutator. What action
must be taken? ANS: None.
Heavy arcing=Light brush pressure. Heavy bush pressure=mechanical wear
12. If rigging gear is roped 3:1 and a BEAM CLAMP is used to lift a 6,000lb load.
What is the beam capacity? ANS: 18,000lbs. 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
13. How much resistance is measured over a normally closed switch?: -
ANS 1.2ohms. should be zero, but will never be that low
14. A car traveling in the hoistway always stops at the same spot and blows a
fuse. What causes this? ANS: Traveling cable has a cut/exposed wire or a short
,15. How is a class 1 yearly buffer test preformed? ANS: 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 seconds.
, 5yr: Full load Full speed
CWT: Full speed Empty
16. How many strain supports are required on a 350ft raceway? ANS: 4. 1 every
100ft
17. How is stainless steel drilled out? ANS: Slow speed and constant pressure
18. What is the required amount of retainer clips for wedge shackles and what
is the spacing? ANS: Minimum 2 clips. 1st at a maximum 4x the diameter of the
rope 2nd at a maximum 8x the diameter above the 1st clip
19. A 300ohm resistor burns out, but you don't have another one. How can you
make one? ANS: 2 600ohm resistors in parallel is 300ohms. Resistance is half of
highest resistor in parallel circuit.
3 225ohm resistors in parallel is 75ohms.
20. When cutting laminated panels, which direction should the finish side
face? ANS: Finish side facing the cutting edge of the tool. Blade will burr the
backside
21. How do you cut a finished floor? ANS: Cutting blade away from finished side
22. A 480vac stepdown 240vac transformer is connected to a 3 phase rectifier,
what is the output voltage? ANS: 320vac
3 phase full wave = 1.33x output voltage