(4-113-1.9) The two major types of compression refrigeration systems are: - ✔✔ Indirect and Direct
(4-116-1.4) The safety head of a refrigeration
... [Show More] compressor is designed to: - ✔✔ 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. - ✔✔ 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 - ✔✔ 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: - ✔✔ Reciprocating, rotary, and centrifugal
(4-117-2.2) Which of the following statements about double tube refrigeration condensers is true? - ✔✔ 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: - ✔✔ Flammable
4-117-1.7) All refrigeration evaporators: - ✔✔ boil liquid refrigerant at low pressure and low temperature
What is the Permissible Exposure Limit for R-717? - ✔✔ 50 ppm
(4-116-1.3) Which of the following is NOT considered a rotary refrigeration compressor design? - ✔✔ Centrifugal
(4-123-1.3) In an Ammonia Absorption refrigeration system, what is used as the absorbent? - ✔✔ 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 - ✔✔ Vane closed switch
(4-123-2.4) The absorber in the lithium bromide refrigeration system is equipped with a pump - ✔✔ To speed the absorption of water vapour
An example of a high leak probability system is a: - ✔✔ a direct expansion system
(4-118-3.2) The low oil pressure cut-off switches of a mechanical refrigeration system - ✔✔ 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: - ✔✔ 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: - ✔✔ 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? - ✔✔ Valves in pressure piping should be closed
(4-114-1.13) The ideal refrigerant should: - ✔✔ 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: - ✔✔ An oil separator
(4-118-3.1) The CSA B52 code requires that ____________________ shall be provided on all systems operating above atmospheric pressure. - ✔✔ pressure limiting devices [Show Less]