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