Z-59 (Electrical Engineering) WRITTEN EXAM
TEST QUESTION AND ANSWERS RATED A.
The cause of a starved evaporator might be
A) low refrigerant charge.
B) high refrigerant charge.
C) superheat that is too low.
D) high condenser water temperature.
Verified Answer -A) low refrigerant charge.
When charging refrigerant on the low-pressure side of a reciprocating
machine with manifold gauges, what is the position of the manifold?
A) High-side and low-side front-seated.
B) High-side, front-seated and low-side, back-seated.
C) High-side, back-seated and low-side, front-seated.
D) High and low back-seated.
Verified Answer -B) High-side, front-seated and low-side, back-seated.
A reciprocating compressor cylinder has a 10-inch more and a 14-inch
stroke. The volume of the refrigerant, in cubic inches, will be close to
A) 1808
B) 1406
C) 1099
,D) 1002
Verified Answer -C) 1099
If R134a comes in contact with a refrigeration engineer's skin, what first
aid should be applied from the MSDS?
A) R134a is a low acute toxicity, so no special medical attention is
required.
B) Promptly flush skin with water until all chemical is removed.
C) Rub the frozen parts.
D) Place the frostbitten parts in hot water (above 130F) to warm them up.
Verified Answer -B) Promptly flush skin with water until all chemical is
removed.
The sole refrigeration engineer on duty in a building is permitted to leave
the building refrigeration system when it is operation only when
A) lunch or dinner occur.
B) the assistant provides coverage or supervision.
C) relieved by another licensed refrigeration engineer.
D) system is in automatic operation.
Verified Answer -C) relieved by another licensed refrigeration engineer.
The thermal bulb is attached to the suction pipe between the evaporator
coil and the compressor by an insulated line. Assume that the machinery
room is at 85*F.; breakdown of the insulation results in
A) excessive superheat.
,B) a starved evaporator.
C) a flooded evaporator.
D) adequate superheat.
Verified Answer -A) excessive superheat.
Of the following, centrifugal refrigerant machines are best characterized
by
A) the use of an air-cooled condenser.
B) the low and high operating pressures.
C) high-volume, low-pressure machine.
D) use of refrigerant for direct cooling of the occupied space.
Verified Answer -C) high-volume, low-pressure machine.
When is a chemical fire extinguisher system needed?
A) Where water is not sufficient.
B) High-rise office buildings.
C) Deluge systems.
D) Pre-action systems.
Verified Answer -A) Where water is not sufficient.
The standpipe certificate should be available for
A) FDNY and OSHA.
B) FDNY and Building Inspector.
, C) FDNY and EPA.
D) FDNY and NFPA.
Verified Answer -B) FDNY and Building Inspector.
As an engineer, you notice that the pressure drops across the evaporator.
You check and notice the external equalized line is disconnected. What will
occur in the evaporator?
A) The evaporator will stabilize.
B) The evaporator will flood.
C) The evaporator will be unaffected.
D) The evaporator will starve.
Verified Answer -B) The evaporator will flood.
A water pump is discharging against head 92-feet of water. This is
approximately to a pressure of
A) 20 psi.
B) 95 psi.
C) 40 psi.
D) 180 psi.
Verified Answer -C) 40 psi.
A refrigerant engineer verifies that a chilled water pump is cavitating. The
most likely cause of this condition is
A) too long a period between pump servicing.
TEST QUESTION AND ANSWERS RATED A.
The cause of a starved evaporator might be
A) low refrigerant charge.
B) high refrigerant charge.
C) superheat that is too low.
D) high condenser water temperature.
Verified Answer -A) low refrigerant charge.
When charging refrigerant on the low-pressure side of a reciprocating
machine with manifold gauges, what is the position of the manifold?
A) High-side and low-side front-seated.
B) High-side, front-seated and low-side, back-seated.
C) High-side, back-seated and low-side, front-seated.
D) High and low back-seated.
Verified Answer -B) High-side, front-seated and low-side, back-seated.
A reciprocating compressor cylinder has a 10-inch more and a 14-inch
stroke. The volume of the refrigerant, in cubic inches, will be close to
A) 1808
B) 1406
C) 1099
,D) 1002
Verified Answer -C) 1099
If R134a comes in contact with a refrigeration engineer's skin, what first
aid should be applied from the MSDS?
A) R134a is a low acute toxicity, so no special medical attention is
required.
B) Promptly flush skin with water until all chemical is removed.
C) Rub the frozen parts.
D) Place the frostbitten parts in hot water (above 130F) to warm them up.
Verified Answer -B) Promptly flush skin with water until all chemical is
removed.
The sole refrigeration engineer on duty in a building is permitted to leave
the building refrigeration system when it is operation only when
A) lunch or dinner occur.
B) the assistant provides coverage or supervision.
C) relieved by another licensed refrigeration engineer.
D) system is in automatic operation.
Verified Answer -C) relieved by another licensed refrigeration engineer.
The thermal bulb is attached to the suction pipe between the evaporator
coil and the compressor by an insulated line. Assume that the machinery
room is at 85*F.; breakdown of the insulation results in
A) excessive superheat.
,B) a starved evaporator.
C) a flooded evaporator.
D) adequate superheat.
Verified Answer -A) excessive superheat.
Of the following, centrifugal refrigerant machines are best characterized
by
A) the use of an air-cooled condenser.
B) the low and high operating pressures.
C) high-volume, low-pressure machine.
D) use of refrigerant for direct cooling of the occupied space.
Verified Answer -C) high-volume, low-pressure machine.
When is a chemical fire extinguisher system needed?
A) Where water is not sufficient.
B) High-rise office buildings.
C) Deluge systems.
D) Pre-action systems.
Verified Answer -A) Where water is not sufficient.
The standpipe certificate should be available for
A) FDNY and OSHA.
B) FDNY and Building Inspector.
, C) FDNY and EPA.
D) FDNY and NFPA.
Verified Answer -B) FDNY and Building Inspector.
As an engineer, you notice that the pressure drops across the evaporator.
You check and notice the external equalized line is disconnected. What will
occur in the evaporator?
A) The evaporator will stabilize.
B) The evaporator will flood.
C) The evaporator will be unaffected.
D) The evaporator will starve.
Verified Answer -B) The evaporator will flood.
A water pump is discharging against head 92-feet of water. This is
approximately to a pressure of
A) 20 psi.
B) 95 psi.
C) 40 psi.
D) 180 psi.
Verified Answer -C) 40 psi.
A refrigerant engineer verifies that a chilled water pump is cavitating. The
most likely cause of this condition is
A) too long a period between pump servicing.
