WGU BIOCHEMISTRY OA
CERTIFICATION SCRIPT 2026
QUESTIONS WITH SOLUTIONS
GRADED A+
◍ 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
◍ You have been provided a unfamiliar brand of solvent to clean brake drums,
What is the best source to determine whether it is safe to use ?.
Answer: SDS
◍ A ladder needs to be extended 20' from the ground floor to the next landing.
How far from the wall should the base of the ladder be ?.
Answer: 5'
◍ How would you get into a pit to service the oil buffer?.
Answer: Operate the Hostway access switch
◍ 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
◍ When you are installing pit equipment, which 2 items are required by
AMSE A17.1 code ?.
Answer: Pit switch and light switch
◍ 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
◍ you are working on scaffolding installing brackets, as you approach the end
of the scaffolding, the plank starts to slip, what should have been done to
prevent this?.
Answer: End cleat should have been nailed to the underside of the plank.
◍ You are installing a car hitch plate and need to determine the correct rope
drop from the machine drive sheave, how would you do this?.
Answer: Drop a plumb line
◍ If a valve shown on the layout drawing is measured at 1 3/8 and the scale is
a 1 to 4 ratio. What is the actual size of the valve spring ?.
Answer: 5 1/2
◍ 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
◍ You direct your helper to get a standard rail, what size should they return
with?.
, Answer: 16'
◍ The safety hitch connecting arm's dimensions are 1 1/4 what is the metric
equivalent in CM ?.
Answer: 3.175 cm 1.25/.3937= 3.175
◍ A moving walk layout indicates a clearance of 6.5mm for the pallet roller,
what dimension would you read in inches on your ruler ?.
Answer: .256" 6.5x.03937 =.255
◍ You are assembling a counterweight in the pit the parameters are cable
length 175'rope stretch 12'/100'Hight of buffer and stand 3' CWT runby
10'pit depth 6'At what hight do you block up the CWT assy far roping ?.
Answer: 67"
◍ Working pressure on a Hydro is 400psi. What is the maximum relief valve
setting?.
Answer: 400psi x 150%= 600psi
◍ You are preparing to drill a hole in a machine beam, what tool will you need
to set the center hole to keep the drill bit from wondering?.
Answer: center punch
◍ For hydraulic elevator instillations, what must be set before pit equipment
can be set?.
Answer: Guide rails
◍ What must be installed on a false car before operation?.
Answer: Spring Loaded Safeties.
◍ When elevator travels above the top landing what prevents it from going
into the overhead?.
Answer: Counterweight Buffer
◍ 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
, ◍ You are assigned to move job boxes and welding equipment to another job
site, what procedure should be takin to transport gas cylinders?.
Answer: Remove gauges, install protective caps and secure in vertical
position.
◍ 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
◍ If a building exceeds 150' of travel, what is used to improve traction
between the hoist ropes and the machine driver ?.
Answer: compensation ropes
◍ When servicing the governor tension sheave, what switch should be used to
prevent the elevator from moving?.
Answer: Pit Stop Switch
◍ How much resistance is measured over a normally closed switch?.
Answer: 1.2ohms. should be zero, but will never be that low
◍ You find a A/C Contactor chattering when energized, what could be the
problem?.
Answer: Missing or broken shading coil
◍ 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
◍ You are plumbing a Hoistway for a bank of elevator's, what lines are
dropped first?.
Answer: The two outside main rails farthest apart
◍ When filing rail joints, what is the distance you must file above and below
the rail joint?.
Answer: 18"
◍ While hoisting a motor generator, what should you use to stabilize the load
CERTIFICATION SCRIPT 2026
QUESTIONS WITH SOLUTIONS
GRADED A+
◍ 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
◍ You have been provided a unfamiliar brand of solvent to clean brake drums,
What is the best source to determine whether it is safe to use ?.
Answer: SDS
◍ A ladder needs to be extended 20' from the ground floor to the next landing.
How far from the wall should the base of the ladder be ?.
Answer: 5'
◍ How would you get into a pit to service the oil buffer?.
Answer: Operate the Hostway access switch
◍ 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
◍ When you are installing pit equipment, which 2 items are required by
AMSE A17.1 code ?.
Answer: Pit switch and light switch
◍ 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
◍ you are working on scaffolding installing brackets, as you approach the end
of the scaffolding, the plank starts to slip, what should have been done to
prevent this?.
Answer: End cleat should have been nailed to the underside of the plank.
◍ You are installing a car hitch plate and need to determine the correct rope
drop from the machine drive sheave, how would you do this?.
Answer: Drop a plumb line
◍ If a valve shown on the layout drawing is measured at 1 3/8 and the scale is
a 1 to 4 ratio. What is the actual size of the valve spring ?.
Answer: 5 1/2
◍ 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
◍ You direct your helper to get a standard rail, what size should they return
with?.
, Answer: 16'
◍ The safety hitch connecting arm's dimensions are 1 1/4 what is the metric
equivalent in CM ?.
Answer: 3.175 cm 1.25/.3937= 3.175
◍ A moving walk layout indicates a clearance of 6.5mm for the pallet roller,
what dimension would you read in inches on your ruler ?.
Answer: .256" 6.5x.03937 =.255
◍ You are assembling a counterweight in the pit the parameters are cable
length 175'rope stretch 12'/100'Hight of buffer and stand 3' CWT runby
10'pit depth 6'At what hight do you block up the CWT assy far roping ?.
Answer: 67"
◍ Working pressure on a Hydro is 400psi. What is the maximum relief valve
setting?.
Answer: 400psi x 150%= 600psi
◍ You are preparing to drill a hole in a machine beam, what tool will you need
to set the center hole to keep the drill bit from wondering?.
Answer: center punch
◍ For hydraulic elevator instillations, what must be set before pit equipment
can be set?.
Answer: Guide rails
◍ What must be installed on a false car before operation?.
Answer: Spring Loaded Safeties.
◍ When elevator travels above the top landing what prevents it from going
into the overhead?.
Answer: Counterweight Buffer
◍ 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
, ◍ You are assigned to move job boxes and welding equipment to another job
site, what procedure should be takin to transport gas cylinders?.
Answer: Remove gauges, install protective caps and secure in vertical
position.
◍ 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
◍ If a building exceeds 150' of travel, what is used to improve traction
between the hoist ropes and the machine driver ?.
Answer: compensation ropes
◍ When servicing the governor tension sheave, what switch should be used to
prevent the elevator from moving?.
Answer: Pit Stop Switch
◍ How much resistance is measured over a normally closed switch?.
Answer: 1.2ohms. should be zero, but will never be that low
◍ You find a A/C Contactor chattering when energized, what could be the
problem?.
Answer: Missing or broken shading coil
◍ 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
◍ You are plumbing a Hoistway for a bank of elevator's, what lines are
dropped first?.
Answer: The two outside main rails farthest apart
◍ When filing rail joints, what is the distance you must file above and below
the rail joint?.
Answer: 18"
◍ While hoisting a motor generator, what should you use to stabilize the load
