- | Page
RETA CARO TEST | QUESTIONS WITH
100% CORRECT ANSWERS | VERIFIED
Question : Which natural refrigerant is considered to be non-
flammable
Correct answer: Carbon Dioxide
Question : 32 psia equals
Correct answer: 17.3 psig
Question : 0 ° F is equal to
Correct answer: -18 ° C
Question : What are the four necessary components of a
mechanical refrigeration system ?
Correct answer: expansion device , evaporator , compressor ,
condenser
Question : What are the replacement blended refrigerants
called ?
- | Page
Correct answer: An azeotrope or zeotrope
Question : What is one positive characteristic of halocarbon
refrigerants ?
Correct answer: They are usually not flammable
Question : O psig is equal to
Correct answer: 14.7 psia
Question : Which category of compressor " traps " a volume
of refrigerant vapor prior to compression ?
Correct answer: Positive displacement
Question : Which of the following expansion devices would
not normally be used as a part of a small refrigeration system ?
Correct answer: Hand expansion valve
Question : Which of the following secondary cooling devices
operates as a thermal storage device ?
- | Page
Correct answer: Ice builder
Question : How many stages or steps are used in most screw
compressor oil separators ?
Correct answer: 4
Question : Which of the following is a danger of slugging in a
compressor ?
Correct answer: Mechanical damage to the compressor and
refrigerant loss
Question : What are the three types of positive displacement
compressors used in industrial refrigeration systems ?
Correct answer: Reciprocating , rotary vane , rotary screw
Question : Which refrigerant was the first to be phased out by
Montreal Protocol ?
Correct answer: CFC 12
- | Page
Question : At a constant pressure , the latent heat of
condensation of a substance is the same as the
Correct answer: latent heat of vaporization of the substance
Question : Which of the following are used in heat
calculations ?
Correct answer: Mass , latent heat , temperature , specific heat
Question : Which of the following is used to measure the
quantity of heat energy ?
Correct answer: British Thermal Units ( BTUs ) or calories
Question : Which of the following is NOT an issue when oil
goes out into the system beyond the compressors , and past the oil separator ?
Correct answer: Improved actuation of the automatic valves
Question : Which of the answers below is an example of heat
transfer by conduction ?