1|Page
DC Master Air Conditioning & Refrigeration
Mechanical Unlimited (311) Verified Exam Actual Test
Questions and Correct Answers With Rationales
LATEST THIS YEAR|| NEWEST EXAM!!!
What is the definition of specific heat - Answer-The
measurement in BTU energy it would take to change the
temperature 1° cooler or hotter
Refrigerant is circulated through a mechanical refrigeration
system by action of what component - Answer-The
compressor
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
,2|Page
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
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
, 3|Page
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
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
DC Master Air Conditioning & Refrigeration
Mechanical Unlimited (311) Verified Exam Actual Test
Questions and Correct Answers With Rationales
LATEST THIS YEAR|| NEWEST EXAM!!!
What is the definition of specific heat - Answer-The
measurement in BTU energy it would take to change the
temperature 1° cooler or hotter
Refrigerant is circulated through a mechanical refrigeration
system by action of what component - Answer-The
compressor
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
,2|Page
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
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
, 3|Page
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
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
