1|Page
NYC SUPERVISOR OF MECHANICS (MECHANICAL
EQUIPMENT) ACTUAL VERIFIED EXAM ALL
QUESTIONS AND CORRECT ANSWERS LATEST
UPDATE THIS YEAR /A+ GRADED||NEWEST EXAM!!!
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.
,2|Page
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
,3|Page
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
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? - 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? - Answer-Finish side facing the cutting
edge of the tool. Blade will burr the backside
, 4|Page
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
NYC SUPERVISOR OF MECHANICS (MECHANICAL
EQUIPMENT) ACTUAL VERIFIED EXAM ALL
QUESTIONS AND CORRECT ANSWERS LATEST
UPDATE THIS YEAR /A+ GRADED||NEWEST EXAM!!!
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.
,2|Page
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
,3|Page
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
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? - 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? - Answer-Finish side facing the cutting
edge of the tool. Blade will burr the backside
, 4|Page
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
