Refrigeration licensing Exam updated
questions and CORRECT answers
The chemical number for ammonia is?
A. R-500
B. R-700
C. R-410A
D. R-717 - CORRECT ANSWER D. R 717
Ammonia should be vented
A. Directly outside
B. To the nearest drain
C. Through a water tank
D. None of the above - CORRECT ANSWER A. Directly outside
The centrifugal compresssor reliefs should be
A. Thermostat
B. Pressure
C. Rupture disk
D. None of the above - CORRECT ANSWER C. Rupture disk
What system has the greatest capacity and efficiency
A. Shell and tube condenser
B. Air condenser
C. Water cooled condenser
,D. None of the above - CORRECT ANSWER C. Water cooled condenser
What should be installed for a condenser unit above the evaporator
A. Relief devices
B. Suction oil trap
C. Steam trap
D. Receiver - CORRECT ANSWER B. Suction oil trap
In highest altitudes the boiling point of any refrigerant is
A. Higher
B. Lower
C. Equal
D. None of the above - CORRECT ANSWER B. Lower
An oil pressure switch shall have
A. An automatic reset
B. A manual reset
C. No reset
D. None of the above - CORRECT ANSWER B. A manual reset
R-123 and R-22 are what type of refrigerants
A. CFC
B. HCFC
C. HFC
D. HFO - CORRECT ANSWER B. HCFC-hydrofluorocarbon
,Adjusting the spring valve on a TXV will
A. Nothing
B. Lower the spring range
C. Change the superheat
D. Change the temperature - CORRECT ANSWER C. Change the superheat
A psychrometer is used for
A. Temperature
B. Pressure
C. Relative Humidity
D. Non of the above - CORRECT ANSWER C. Relive humidity
What can be installed when a condensing system needs to run all year
A. Freeze stat
B. Drive
C. Low ambient control
D. Aquastat - CORRECT ANSWER A. Freeze stat
How are gaseous pressures measured
A. Pressure gauge
B. Mamometer
C. Flow hood
D. Psychometer - CORRECT ANSWER B. Manometer
, Converting liquid to a vapor is called
A. Superheat
B. Subcooling
C. Vaporization
D. None of the above - CORRECT ANSWER C. Vaporization
The density fo gas is measured in
A. Foot lbs
B. Lbs per square foot
C. Area volume
D. Cfm - CORRECT ANSWER C. Area volume
What are the two types of evaporators
A. Flat
B. Flooded and direct expansion
C. Expansion and limited
D. None of the above - CORRECT ANSWER B. Direct expansion, flooded
Where should an oil seperator be located
A. The discharge line
B. The evaporator
C. Base of the unit
D. None of the above - CORRECT ANSWER A. The discharge line
The formula for power in a resistance circuit is
questions and CORRECT answers
The chemical number for ammonia is?
A. R-500
B. R-700
C. R-410A
D. R-717 - CORRECT ANSWER D. R 717
Ammonia should be vented
A. Directly outside
B. To the nearest drain
C. Through a water tank
D. None of the above - CORRECT ANSWER A. Directly outside
The centrifugal compresssor reliefs should be
A. Thermostat
B. Pressure
C. Rupture disk
D. None of the above - CORRECT ANSWER C. Rupture disk
What system has the greatest capacity and efficiency
A. Shell and tube condenser
B. Air condenser
C. Water cooled condenser
,D. None of the above - CORRECT ANSWER C. Water cooled condenser
What should be installed for a condenser unit above the evaporator
A. Relief devices
B. Suction oil trap
C. Steam trap
D. Receiver - CORRECT ANSWER B. Suction oil trap
In highest altitudes the boiling point of any refrigerant is
A. Higher
B. Lower
C. Equal
D. None of the above - CORRECT ANSWER B. Lower
An oil pressure switch shall have
A. An automatic reset
B. A manual reset
C. No reset
D. None of the above - CORRECT ANSWER B. A manual reset
R-123 and R-22 are what type of refrigerants
A. CFC
B. HCFC
C. HFC
D. HFO - CORRECT ANSWER B. HCFC-hydrofluorocarbon
,Adjusting the spring valve on a TXV will
A. Nothing
B. Lower the spring range
C. Change the superheat
D. Change the temperature - CORRECT ANSWER C. Change the superheat
A psychrometer is used for
A. Temperature
B. Pressure
C. Relative Humidity
D. Non of the above - CORRECT ANSWER C. Relive humidity
What can be installed when a condensing system needs to run all year
A. Freeze stat
B. Drive
C. Low ambient control
D. Aquastat - CORRECT ANSWER A. Freeze stat
How are gaseous pressures measured
A. Pressure gauge
B. Mamometer
C. Flow hood
D. Psychometer - CORRECT ANSWER B. Manometer
, Converting liquid to a vapor is called
A. Superheat
B. Subcooling
C. Vaporization
D. None of the above - CORRECT ANSWER C. Vaporization
The density fo gas is measured in
A. Foot lbs
B. Lbs per square foot
C. Area volume
D. Cfm - CORRECT ANSWER C. Area volume
What are the two types of evaporators
A. Flat
B. Flooded and direct expansion
C. Expansion and limited
D. None of the above - CORRECT ANSWER B. Direct expansion, flooded
Where should an oil seperator be located
A. The discharge line
B. The evaporator
C. Base of the unit
D. None of the above - CORRECT ANSWER A. The discharge line
The formula for power in a resistance circuit is
