TSSA 4TH CLASS B LATEST
EXAM
Unit 1 Lubrication and bearings
Ammonia, as well as being toxic, is also:
Select one:
a. A low pressure refrigerant
b. Flammable
c. Miscible with oil
d. Odourless - ANSWERS-b. Flammable
In the lithium bromide refrigeration system, what is the function of the
concentrator (generator)?
Select one:
a. To cool the concentrated absorbent
b. To speed up the evaporation of the refrigerant
c. To increase the absorbency potential of used absorbent
d. To exchange heat between the high temperature refrigerant vapour
and the atmosphere - ANSWERS-c. To increase the absorbency
potential of used absorbent
END OF
PAGE
1
, TSSA 4TH CLASS B LATEST
EXAM
When a chiller has stopped due to low water temperature, and the chilled
water temperature subsequently rises approximately 5 to 6°C above the
chilled water temperature set point, the:
Select one:
a. Condenser pump will restart
b. Compressor will unload
c. Cooling tower fan will restart
d. Compressor will restart - ANSWERS-d. Compressor will restart
Which of the following statements about refrigeration pressure gauges is
TRUE?
Select one:
a. Permanently installed pressure gauges shall be constructed for at least
1.5 times the high side design pressure.
b. Only one pressure gauge is normally installed on a system.
c. The CSA B52 Code requires permanently installed pressure gauges on
all refrigeration systems.
d. Refrigeration pressure gauges can indicate saturation temperatures in
a system. - ANSWERS-d. Refrigeration pressure gauges can indicate
saturation temperatures in a system.
END OF
PAGE
2
, TSSA 4TH CLASS B LATEST
EXAM
Which of the following is not a component of the low pressure side of a
compression refrigeration system?
Select one:
a. The suction line
b. The downstream side of the expansion valve
c. The evaporator
d. Compressor discharge piping - ANSWERS-d. Compressor discharge
piping
The safety head of a refrigeration compressor is designed to:
Select one:
a. Take the place of a safety relief valve
b. Prevent damage due to freeze-up
c. Relieve pressure due to liquid in the cylinder
d. Unload cylinders ifover-loaded - ANSWERS-c. Relieve pressure due
to liquid in the cylinder
When a liquid evaporates, it
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PAGE
3
, TSSA 4TH CLASS B LATEST
EXAM
Select one:
a. Loses latent heat
b. Loses sensible heat
c. Gains latent heat
d. Gains sensible heat - ANSWERS-c. Gains latent heat
One tonne of refrigeration is:
Select one:
a. 13958 J per hour
b. 233 kJ per minute
c. 1000 kg of mass
d. 13958 kJ per day - ANSWERS-b. 233 kJ per minute
R-134a
Select one:
a. is explosive when mixed with air
b. is an ozone-depleting substance
c. is non-toxic
END OF
PAGE
4
EXAM
Unit 1 Lubrication and bearings
Ammonia, as well as being toxic, is also:
Select one:
a. A low pressure refrigerant
b. Flammable
c. Miscible with oil
d. Odourless - ANSWERS-b. Flammable
In the lithium bromide refrigeration system, what is the function of the
concentrator (generator)?
Select one:
a. To cool the concentrated absorbent
b. To speed up the evaporation of the refrigerant
c. To increase the absorbency potential of used absorbent
d. To exchange heat between the high temperature refrigerant vapour
and the atmosphere - ANSWERS-c. To increase the absorbency
potential of used absorbent
END OF
PAGE
1
, TSSA 4TH CLASS B LATEST
EXAM
When a chiller has stopped due to low water temperature, and the chilled
water temperature subsequently rises approximately 5 to 6°C above the
chilled water temperature set point, the:
Select one:
a. Condenser pump will restart
b. Compressor will unload
c. Cooling tower fan will restart
d. Compressor will restart - ANSWERS-d. Compressor will restart
Which of the following statements about refrigeration pressure gauges is
TRUE?
Select one:
a. Permanently installed pressure gauges shall be constructed for at least
1.5 times the high side design pressure.
b. Only one pressure gauge is normally installed on a system.
c. The CSA B52 Code requires permanently installed pressure gauges on
all refrigeration systems.
d. Refrigeration pressure gauges can indicate saturation temperatures in
a system. - ANSWERS-d. Refrigeration pressure gauges can indicate
saturation temperatures in a system.
END OF
PAGE
2
, TSSA 4TH CLASS B LATEST
EXAM
Which of the following is not a component of the low pressure side of a
compression refrigeration system?
Select one:
a. The suction line
b. The downstream side of the expansion valve
c. The evaporator
d. Compressor discharge piping - ANSWERS-d. Compressor discharge
piping
The safety head of a refrigeration compressor is designed to:
Select one:
a. Take the place of a safety relief valve
b. Prevent damage due to freeze-up
c. Relieve pressure due to liquid in the cylinder
d. Unload cylinders ifover-loaded - ANSWERS-c. Relieve pressure due
to liquid in the cylinder
When a liquid evaporates, it
END OF
PAGE
3
, TSSA 4TH CLASS B LATEST
EXAM
Select one:
a. Loses latent heat
b. Loses sensible heat
c. Gains latent heat
d. Gains sensible heat - ANSWERS-c. Gains latent heat
One tonne of refrigeration is:
Select one:
a. 13958 J per hour
b. 233 kJ per minute
c. 1000 kg of mass
d. 13958 kJ per day - ANSWERS-b. 233 kJ per minute
R-134a
Select one:
a. is explosive when mixed with air
b. is an ozone-depleting substance
c. is non-toxic
END OF
PAGE
4
