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DC Master Air Conditioning and Refrigeration
Mechanical Unlimited (311) Exam Actual
Test||VERIFIED EXAM!!!|| Questions and Correct
Answers With Rationales LATEST THIS
YEAR.pdf||NEWEST EXAM!!!
In terms of the running of a refrigeration compressor what
is the meaning of short cycling - Answer-The frequent start
and stop of the compressor
What is the name for when liquid reaches the compressor
- Answer-Flood back or slugging back
Sub cooling is a method of reducing the temperature of
the liquid refrigerant below what temperature or point -
Answer-Refrigerant is lower than it's condensing
saturation condition relative to its existing pressure.
Entirely liquid state
A liquid to suction line heat into change it in a refrigeration
system using a reciprocating compressor so what purpose
- Answer-Remove heat from the liquid line further
subcooled the liquid increases evaporator efficiency
,2|Page
adding heat to the suction line helps guard against liquid
floodback
What component in the refrigeration cycle does absorbs
the latent heat of vaporization - Answer-Evaporator
What state of refrigeration enters the compressor -
Answer-Low pressure low temperature superheated vapor
In which refrigeration system component does
superheating of the refrigerant take place - Answer-The
evaporator
In the order of the direction of flow the low pressure side a
refrigeration system is considered to exist between which
two components - Answer-TXV outlet to beginning of
compressor
What will happen to the compressor suction pressure as
the heat load increases in the refrigeration cycle - Answer-
Suction pressure will increase with temperature increase
LLBSVopens to send more refrigerant
, 3|Page
One refrigeration ton is equal to how many BTUs per day -
Answer-288,000
1 ref ton is equaled to how many BTUs per hour - Answer-
288,000/24= 12,000 BTUs Per Hour
What is the primary purpose of thermostatic expansion
valve in a typical multi box shipboard refrigeration system -
Answer-Control the flow of refrigerant into the evaporator
and maintain continuous outlet superheat
What is the definition of direct system - Answer-
Refrigerant absorbs heat of space
What is the definition of indirect system - Answer-Primary
refrigerant cools secondary refrigerant and secondary
refrigerant cools space
When should the oil level of the compressor be checked -
Answer-15 minutes after start up 15 minutes after shut
down several minutes after I shut down when unit has
been running for long periods of time
DC Master Air Conditioning and Refrigeration
Mechanical Unlimited (311) Exam Actual
Test||VERIFIED EXAM!!!|| Questions and Correct
Answers With Rationales LATEST THIS
YEAR.pdf||NEWEST EXAM!!!
In terms of the running of a refrigeration compressor what
is the meaning of short cycling - Answer-The frequent start
and stop of the compressor
What is the name for when liquid reaches the compressor
- Answer-Flood back or slugging back
Sub cooling is a method of reducing the temperature of
the liquid refrigerant below what temperature or point -
Answer-Refrigerant is lower than it's condensing
saturation condition relative to its existing pressure.
Entirely liquid state
A liquid to suction line heat into change it in a refrigeration
system using a reciprocating compressor so what purpose
- Answer-Remove heat from the liquid line further
subcooled the liquid increases evaporator efficiency
,2|Page
adding heat to the suction line helps guard against liquid
floodback
What component in the refrigeration cycle does absorbs
the latent heat of vaporization - Answer-Evaporator
What state of refrigeration enters the compressor -
Answer-Low pressure low temperature superheated vapor
In which refrigeration system component does
superheating of the refrigerant take place - Answer-The
evaporator
In the order of the direction of flow the low pressure side a
refrigeration system is considered to exist between which
two components - Answer-TXV outlet to beginning of
compressor
What will happen to the compressor suction pressure as
the heat load increases in the refrigeration cycle - Answer-
Suction pressure will increase with temperature increase
LLBSVopens to send more refrigerant
, 3|Page
One refrigeration ton is equal to how many BTUs per day -
Answer-288,000
1 ref ton is equaled to how many BTUs per hour - Answer-
288,000/24= 12,000 BTUs Per Hour
What is the primary purpose of thermostatic expansion
valve in a typical multi box shipboard refrigeration system -
Answer-Control the flow of refrigerant into the evaporator
and maintain continuous outlet superheat
What is the definition of direct system - Answer-
Refrigerant absorbs heat of space
What is the definition of indirect system - Answer-Primary
refrigerant cools secondary refrigerant and secondary
refrigerant cools space
When should the oil level of the compressor be checked -
Answer-15 minutes after start up 15 minutes after shut
down several minutes after I shut down when unit has
been running for long periods of time
