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?
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?
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?
Answer:Suicide Circuit
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
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
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?
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?
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?
Answer:Adjust Tie Downs and Wall Ties
,Working pressure on a Hydro is 400psi. What is the maximum
relief valve setting?
Answer:400psi x 150%= 600psi
What must be installed on a false car before operation?
Answer:Spring Loaded Safeties.
There is slight arcing between the brush and commutator. What
action must be taken?
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?
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?
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?
Answer:Traveling cable has a cut/exposed wire or a short
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 seconds.
5yr: Full load Full speed
CWT: Full speed Empty
How many strain supports are required on a 350ft raceway?
Answer:4. 1 every 100ft
How is stainless steel drilled out?
Answer:Slow speed and constant pressure
What is the required amount of retainer clips for wedge
shackles and what is the spacing?
Answer:Minimum 2 clips. 1st at a maximum 4x the diameter of
the rope
Review
A contractor wants to raise the car speed from 100fpm to
125fpm, it currently has a 12" sheave. What sheave is
required?
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?
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?
Answer:Suicide Circuit
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
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
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?
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?
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?
Answer:Adjust Tie Downs and Wall Ties
,Working pressure on a Hydro is 400psi. What is the maximum
relief valve setting?
Answer:400psi x 150%= 600psi
What must be installed on a false car before operation?
Answer:Spring Loaded Safeties.
There is slight arcing between the brush and commutator. What
action must be taken?
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?
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?
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?
Answer:Traveling cable has a cut/exposed wire or a short
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 seconds.
5yr: Full load Full speed
CWT: Full speed Empty
How many strain supports are required on a 350ft raceway?
Answer:4. 1 every 100ft
How is stainless steel drilled out?
Answer:Slow speed and constant pressure
What is the required amount of retainer clips for wedge
shackles and what is the spacing?
Answer:Minimum 2 clips. 1st at a maximum 4x the diameter of
the rope
