Pan Global Unit 9 Exam Questions with
Correct Answers
One tone of refrigeration is:
a. 13958 kJ per day
b. 1000 kg of mass
c. 233 kJ per minute
d. 13958 J per hour - Answer-C
Which of the following is NOT an advantage of a factory assembled, packaged
refrigeration unit?
a. Components are designed to match each other
b. The final installation does not need to meet CSA B52 code
c. The unit is equipped with all the required auxiliary equipment
d. The unit is factory tested in operation
Feedback - Answer-B
A compression refrigeration system may be pumped down for which of the following
reasons?
a. To perform maintenance on the condenser.
b. To perform maintenance on the high-pressure side of the system.
c. To perform maintenance at the discharge of the compressor.
d. To perform maintenance on the low-pressure side of the system. - Answer-D
Oil buildup in a refrigeration system will result in:
a. Increased condenser efficiency
b. Reduced compressor power consumption
c. Reduced refrigeration system efficiency
d. Increased heat transfer - Answer-C
Which of the following steps is NOT part of a start-up of a reciprocating or rotary
compressor refrigerating system?
a. Check for proper oil level in the compressor
b. Open shutoff valves in the cooling water supply and return lines of water-cooled
condensers
c. Valves in pressure piping should be closed
d. Check the setting of high and low pressure cut-off switches - Answer-C
,A compression refrigeration system can be divided into two sections: a high pressure
section containing the head pressure and a low pressure section carrying the _____
pressure:
a. Discharge
b. Saturation
c. Absolute
d. Suction - Answer-D
The ideal refrigerant should:
a. Have a high boiling point at atmospheric pressure.
b. Have high condensing pressure
c. Have a low ozone depleting potential and a low global warming potential
d. Have a low latent heat capacity - Answer-C
A direct expansion type evaporator that has more than one refrigerant circuit requires
__________ to provide even refrigerant flow in each circuit.
a. An expansion valve
b. A distributor
c. A purge valve
d. A backpressure regulator - Answer-B
The specific gravity of a brine sample provides an indication of the:
a. Concentration of inhibitor
b. Acidity or alkalinity
c. Freezing temperature
d. Concentration of ammonia - Answer-C
A sulfur candle is used to test for
a. R-744 leaks
b. R-717 leaks
c. R-290 leaks
d. CFC leaks - Answer-B
n a lithium bromide refrigeration system, which of the following is the refrigerant?
a. Lithium bromide
b. Lithium solution
c. Water
d. Aqueous bromine - Answer-C
, The rate at which a refrigeration system removes heat from the refrigerated medium is
defined as:
a. the Coefficient of Performance
b. the Net Cooling Effect
c. the refrigeration capacity.
d. the Compression Ratio - Answer-C
What must be located outside a Class T machinery room?
a. Spare flashlights
b. Machinery shut off switch
c. Disposable coveralls
d. Light switches - Answer-B
Ammonia, as well as being toxic, is also:
a. Miscible with oil
b. Odourless
c. Flammable
d. A low pressure refrigerant - Answer-C
The safety head of a refrigeration compressor is designed to:
a. Unload cylinders if over-loaded
b. Relieve pressure due to liquid in the cylinder
c. Prevent damage due to freeze-up
d. Take the place of a safety relief valve - Answer-B
A safety control designed to protect the chiller from freezing is the:
a. Vane closed switch
b. Low oil pressure shut down switch
c. Motor demand limiter
d. Chilled water flow switch - Answer-D
Ammonia systems are seldom used for air conditioning purposes in large building
mainly because ammonia:
a. Systems require more power than most building systems can provide.
b. Is too toxic.
c. Does not provide sufficient cooling capacity for large installations.
d. Systems require too much maintenance.
Feedback - Answer-B
Correct Answers
One tone of refrigeration is:
a. 13958 kJ per day
b. 1000 kg of mass
c. 233 kJ per minute
d. 13958 J per hour - Answer-C
Which of the following is NOT an advantage of a factory assembled, packaged
refrigeration unit?
a. Components are designed to match each other
b. The final installation does not need to meet CSA B52 code
c. The unit is equipped with all the required auxiliary equipment
d. The unit is factory tested in operation
Feedback - Answer-B
A compression refrigeration system may be pumped down for which of the following
reasons?
a. To perform maintenance on the condenser.
b. To perform maintenance on the high-pressure side of the system.
c. To perform maintenance at the discharge of the compressor.
d. To perform maintenance on the low-pressure side of the system. - Answer-D
Oil buildup in a refrigeration system will result in:
a. Increased condenser efficiency
b. Reduced compressor power consumption
c. Reduced refrigeration system efficiency
d. Increased heat transfer - Answer-C
Which of the following steps is NOT part of a start-up of a reciprocating or rotary
compressor refrigerating system?
a. Check for proper oil level in the compressor
b. Open shutoff valves in the cooling water supply and return lines of water-cooled
condensers
c. Valves in pressure piping should be closed
d. Check the setting of high and low pressure cut-off switches - Answer-C
,A compression refrigeration system can be divided into two sections: a high pressure
section containing the head pressure and a low pressure section carrying the _____
pressure:
a. Discharge
b. Saturation
c. Absolute
d. Suction - Answer-D
The ideal refrigerant should:
a. Have a high boiling point at atmospheric pressure.
b. Have high condensing pressure
c. Have a low ozone depleting potential and a low global warming potential
d. Have a low latent heat capacity - Answer-C
A direct expansion type evaporator that has more than one refrigerant circuit requires
__________ to provide even refrigerant flow in each circuit.
a. An expansion valve
b. A distributor
c. A purge valve
d. A backpressure regulator - Answer-B
The specific gravity of a brine sample provides an indication of the:
a. Concentration of inhibitor
b. Acidity or alkalinity
c. Freezing temperature
d. Concentration of ammonia - Answer-C
A sulfur candle is used to test for
a. R-744 leaks
b. R-717 leaks
c. R-290 leaks
d. CFC leaks - Answer-B
n a lithium bromide refrigeration system, which of the following is the refrigerant?
a. Lithium bromide
b. Lithium solution
c. Water
d. Aqueous bromine - Answer-C
, The rate at which a refrigeration system removes heat from the refrigerated medium is
defined as:
a. the Coefficient of Performance
b. the Net Cooling Effect
c. the refrigeration capacity.
d. the Compression Ratio - Answer-C
What must be located outside a Class T machinery room?
a. Spare flashlights
b. Machinery shut off switch
c. Disposable coveralls
d. Light switches - Answer-B
Ammonia, as well as being toxic, is also:
a. Miscible with oil
b. Odourless
c. Flammable
d. A low pressure refrigerant - Answer-C
The safety head of a refrigeration compressor is designed to:
a. Unload cylinders if over-loaded
b. Relieve pressure due to liquid in the cylinder
c. Prevent damage due to freeze-up
d. Take the place of a safety relief valve - Answer-B
A safety control designed to protect the chiller from freezing is the:
a. Vane closed switch
b. Low oil pressure shut down switch
c. Motor demand limiter
d. Chilled water flow switch - Answer-D
Ammonia systems are seldom used for air conditioning purposes in large building
mainly because ammonia:
a. Systems require more power than most building systems can provide.
b. Is too toxic.
c. Does not provide sufficient cooling capacity for large installations.
d. Systems require too much maintenance.
Feedback - Answer-B
