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TSSA 4th Part B - Unit 9 Exam Latest Update
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TSSA 4th Part B - Unit 9 ExamLatest Update
(4-113-1.9) The two major types of compression refrigeration systems are: - Answer
Indirect and Direct
(4-116-1.4) The safety head of a refrigeration compressor is designed to: - Answer
Relieve pressure due to liquid in the cylinder
(4-120-1.2) A pressure relief device on a refrigeration system shall have sufficient
capacity to prevent the pressure in the pressure vessel from rising more than _____
above the setting of the pressure relief device. - Answer 0.1
(4-117-2.1) The amount of water used in an evaporative condenser is only a small
percentage of that used in a water-cooled condenser of the same capacity, because -
Answer The cooling water evaporates, removing far more heat per kilogram of system
coolant.
(4-116-int.2) The three main classifications of refrigeration compressors are: - Answer
Reciprocating, rotary, and centrifugal
(4-117-2.2) Which of the following statements about double tube refrigeration
condensers is true? - Answer Water flows in the inner tube in the opposite direction of
the flow of refrigerant.
(4-114-1.6) Ammonia, as well as being toxic, is also: - Answer Flammable
4-117-1.7) All refrigeration evaporators: - Answer boil liquid refrigerant at low pressure
and low temperature
What is the Permissible Exposure Limit for R-717? - Answer 50 ppm
(4-116-1.3) Which of the following is NOT considered a rotary refrigeration compressor
design? - Answer Centrifugal
(4-123-1.3) In an Ammonia Absorption refrigeration system, what is used as the
absorbent? - Answer Water
(4-122-2.1) The safety control of a centrifugal compressor, that ensures the compressor
only starts under a no-load condition, is called the - Answer Vane closed switch
(4-123-2.4) The absorber in the lithium bromide refrigeration system is equipped with a
pump - Answer To speed the absorption of water vapour
An example of a high leak probability system is a: - Answer a direct expansion system
(4-118-3.2) The low oil pressure cut-off switches of a mechanical refrigeration system -
, Answer shut down the compressor when the oil pressure drops below the minimum
required value
(4-117-2.4) The refrigeration condenser design that requires chemical cleaning,
because it cannot be mechanically cleaned, is the: - Answer Shell and coil condenser
(4-122-2.3) If the chilled water temperature drops approximately 2.5-3°C below the
chilled water temperature set point, the chilled water low temperature cut out will: -
Answer Shut down the compressor
(4-122-1.1) Which of the following steps is NOT part of a start-up of a reciprocating or
rotary compressor refrigerating system? - Answer Valves in pressure piping should be
closed
(4-114-1.13) The ideal refrigerant should: - Answer Have a low ozone depleting potential
and a low global warming potential
(4-120-1.7) The accessory that maintains efficient heat transfer by collecting oil before it
coats the tubes of the condenser is called: - Answer An oil separator
(4-118-3.1) The CSA B52 code requires that ____________________ shall be provided on all
systems operating above atmospheric pressure. - Answer pressure limiting devices
(4-117-1.8) Of the following refrigeration system evaporators, the ___________
evaporators require the largest refrigerant charge. - Answer Flooded
(4-114-1.3) R-744 is non-toxic and non-flammable. Which safety group does it belong to?
- Answer Group A1
(4-123-1.2) Which of the following is not found on the low side of an ammonia absorption
refrigeration system? - Answer Generator
(4-113-1.2) Heat that causes an increase in temperature, is called _____ heat: - Answer
Sensible
(4-114-2.1) Which of the following is NOT a physical property of refrigerants? - Answer
Corrosiveness
(4-119-1.1) The most widely used refrigerant metering device, which consists of a
pressure-sensitive bellows or diaphragm connected to a temperature sensing bulb, is
the - Answer thermostatic expansion valve
(4-123-1.4) In an ammonia absorption refrigeration system, the _____ ammonia is
absorbed by the _____ aqua. - Answer Vapourized, weak
(4-123-2.2) In the lithium bromide refrigeration system, what is the function of the
concentrator (generator)? - Answer To increase the absorbency potential of used
absorbent
(4-113-1.6) In a closed vessel, the boiling point of a liquid can be raised by: - Answer
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