NJ BLUE SEAL REFRIGERATION Exam 2
Questions And Verified Answers Detailed Answers
What would happen if you had a sudden drop in the
temperature in the cooling tower of a lithium bromide
absorption system?
Crystallization in the system
What is the function of a heat exchanger in an absorption
system?
Allows the weak liquor to heat the strong liquor
Define the term "refrigerant reclaiming"
Selling reprocessed refrigerant as "reclaimed refrigerant" ;
Reprocessing the refrigerant into a new product that can be
reused ; Chemically analyzing and distilling the refrigerant ; All of
the above
Which phrase best describes the term "free air"?
Air at atmospheric conditions
How is the setting on a thermostatic expansion valve rated?
Degrees of superheat
Which statement describes the operation of a single acting
compressor?
The refrigeration gas is compressed on only one side of the piston
Which of the following would cause a noisy compressor?
Lack of oil ; Dry damaged seal ; Loose drive coupling ; All of the
above
When the evaporator load increases, what happens to the
suction pressure of the system?
Flow remains constant with a corresponding pressure increase
,Thermostatic expansion valves are rated in what units of
measurement?
Tons of refrigeration
If a cooling tower has a pH of 7.8 it is considered
Slightly alkaline
Where would you find flash gas in an efficiently operating
system?
The evaporator
The capacity of an evaporative condenser is determined by
The amount of heat the entering air can absorb ; The amount of
air flowing over the coil ; The area of the refrigerant coil surface ;
All of the above
The ratio between the actual pressures of the vapor to its
saturation pressure in the atmosphere is known as
Relative Humidity
A cooling tower is circulating 2,850 GPM of water: What is
the cooling capacity in tons?
950 tons
What conditions can cause high discharge pressure in a
system?
Refrigerant overcharge ; An undersized condenser ; Insufficient
cooling water to the condenser ; All of the above
What would frost on the suction line of a system using a high
side float indicate?
Overcharged system
In an absorption system, what would cause the strength of
the strong liquor to decrease?
Decrease in the load on the evaporator
What type of heat exchange occurs at the exterior sides of a
cooling tower?
Convection
, Which of the following statements is true regarding the
compression ratio of a reciprocating compressor?
Ratio varies according to the conditions under which it operates
If the high side float were to fill with liquid and sink, what
would be the result?
The evaporator would starve for refrigerant
In a refrigeration system, what part is considered the low
side?
Between the compressor and evaporator
What function does the evaporator perform in a refrigeration
system?
None of the above
Why is a horizontal shell and tube condenser more efficient
than a vertical shell and tube condenser?
Has more than one pass
On a two-stage system, where should the booster
compressor be located?
Between the evaporator and intercooler
What is the maximum amount of refrigerant allowed in a 120
lb. cylinder?
96 lbs.
One ton of refrigeration equals
The removal of 12,000 btu/hr
Which statement best defines the operation of a
synchronous motor?
Starts on AC, operates on AC/DC
Which statement best defines the operation of the valves of a
refrigeration compressor?
They are opened and closed by pressure difference
Where is oiling required on a centrifugal refrigeration
system?
Questions And Verified Answers Detailed Answers
What would happen if you had a sudden drop in the
temperature in the cooling tower of a lithium bromide
absorption system?
Crystallization in the system
What is the function of a heat exchanger in an absorption
system?
Allows the weak liquor to heat the strong liquor
Define the term "refrigerant reclaiming"
Selling reprocessed refrigerant as "reclaimed refrigerant" ;
Reprocessing the refrigerant into a new product that can be
reused ; Chemically analyzing and distilling the refrigerant ; All of
the above
Which phrase best describes the term "free air"?
Air at atmospheric conditions
How is the setting on a thermostatic expansion valve rated?
Degrees of superheat
Which statement describes the operation of a single acting
compressor?
The refrigeration gas is compressed on only one side of the piston
Which of the following would cause a noisy compressor?
Lack of oil ; Dry damaged seal ; Loose drive coupling ; All of the
above
When the evaporator load increases, what happens to the
suction pressure of the system?
Flow remains constant with a corresponding pressure increase
,Thermostatic expansion valves are rated in what units of
measurement?
Tons of refrigeration
If a cooling tower has a pH of 7.8 it is considered
Slightly alkaline
Where would you find flash gas in an efficiently operating
system?
The evaporator
The capacity of an evaporative condenser is determined by
The amount of heat the entering air can absorb ; The amount of
air flowing over the coil ; The area of the refrigerant coil surface ;
All of the above
The ratio between the actual pressures of the vapor to its
saturation pressure in the atmosphere is known as
Relative Humidity
A cooling tower is circulating 2,850 GPM of water: What is
the cooling capacity in tons?
950 tons
What conditions can cause high discharge pressure in a
system?
Refrigerant overcharge ; An undersized condenser ; Insufficient
cooling water to the condenser ; All of the above
What would frost on the suction line of a system using a high
side float indicate?
Overcharged system
In an absorption system, what would cause the strength of
the strong liquor to decrease?
Decrease in the load on the evaporator
What type of heat exchange occurs at the exterior sides of a
cooling tower?
Convection
, Which of the following statements is true regarding the
compression ratio of a reciprocating compressor?
Ratio varies according to the conditions under which it operates
If the high side float were to fill with liquid and sink, what
would be the result?
The evaporator would starve for refrigerant
In a refrigeration system, what part is considered the low
side?
Between the compressor and evaporator
What function does the evaporator perform in a refrigeration
system?
None of the above
Why is a horizontal shell and tube condenser more efficient
than a vertical shell and tube condenser?
Has more than one pass
On a two-stage system, where should the booster
compressor be located?
Between the evaporator and intercooler
What is the maximum amount of refrigerant allowed in a 120
lb. cylinder?
96 lbs.
One ton of refrigeration equals
The removal of 12,000 btu/hr
Which statement best defines the operation of a
synchronous motor?
Starts on AC, operates on AC/DC
Which statement best defines the operation of the valves of a
refrigeration compressor?
They are opened and closed by pressure difference
Where is oiling required on a centrifugal refrigeration
system?
