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On a single acting reciprocating compressor, what is the function of a dual control device?
correct answers It allows constant speed control and stops and starts
If a system were using an automatic expansion valve, where would the constant pressure be
maintained at? correct answers The evaporator
What is the main advantage of a cascade refrigeration system? correct answers Capable of
reaching very low temperatures
A false statement about lithium bromide used in absorption systems: correct answers It is non-
corrosive
What is a sling psychrometer used to measure? correct answers Relative humidity
Discribe the discharge gas from the compressor in a wet-compression refrigeration system
correct answers Saturated
If a cooling tower circulated 4,300 GPM of water, what is the cooling capacity in tons? correct
answers 4,300/3 = 1,433 tons
What condition would cause a system to not respond to an expansion valve adjustment? correct
answers Oil in the evaporator
What would have the least effect on the capacity of a water cooled condenser? correct answers
The ambient air temperature
What is the volume occupied by a refrigerant under specified conditions of pressure and
temperature? correct answers Specific volume
,What should cooling tower water pH be maintained at? correct answers 8
The absolute Celsius scale is referred to by which temperature scale? correct answers Kelvin
Which devices control the high side float? correct answers Condenser and receiver
In Fahrenheit, what is the equivalent of -15 degrees Celsius? correct answers 5 degrees F
If you had a flooded evaporator, which type of metering device would you use? correct answers
Low side float
What is the formula used to determine the number of cycles of concentration for a cooling
tower? correct answers Cycles = Tower water chlorides / makeup water chlorides
What determines the low side pressure in a refrigeration system? correct answers The evaporator
flow rate
What seal is not used on a refrigeration system? correct answers Mechanical
What water chemistry test is used to determine cooling tower cycles of concentration? correct
answers Chlorides
What would happen if you had a sudden drop in the temperature in the cooling tower of a lithium
bromide absorption system? correct answers Crystallization in the system
Define the term "Refrigerant reclaiming" correct answers Chemically analyzing and distilling the
refrigerant; Reprocessing the refrigerant into a new product that can be reused; Selling
reprocessed refrigerant as reclaimed refrigerant
, Describe the term "free air" correct answers Air at atmospheric conditions
How is the setting on a thermostic expansion valve rated? correct answers Degrees of superheat
Describe the operation of a single acting compressor correct answers The refrigerant gas is
compressed on only one side of the piston
What would cause a noisy compressor? correct answers Lack of oil; dry or damaged seal; loose
drive coupling
Thermostatic expansion valves are rated in what units of measurement? correct answers Tons of
refrigeration
If a cooling tower has a pH of 7.8, it is: correct answers Slightly alkaline
Where would you find flash gas in an efficiently operating system? correct answers In the
evaporator
A cooling tower is circulating 2,850 GPM of water; what is the cooling capacity in tons? correct
answers 2,850/3 = 950 tons
What conditions can cause high discharge pressure in a system? correct answers Refrigerant
overcharge; an undersized condenser; insufficient cooling water to the condenser
What would frost on the suction line of a system using a high side floate indicate? correct
answers Overcharged system
What type of heat exchange occurs at the exterior sides of a cooling tower? correct answers
Convection
On a single acting reciprocating compressor, what is the function of a dual control device?
correct answers It allows constant speed control and stops and starts
If a system were using an automatic expansion valve, where would the constant pressure be
maintained at? correct answers The evaporator
What is the main advantage of a cascade refrigeration system? correct answers Capable of
reaching very low temperatures
A false statement about lithium bromide used in absorption systems: correct answers It is non-
corrosive
What is a sling psychrometer used to measure? correct answers Relative humidity
Discribe the discharge gas from the compressor in a wet-compression refrigeration system
correct answers Saturated
If a cooling tower circulated 4,300 GPM of water, what is the cooling capacity in tons? correct
answers 4,300/3 = 1,433 tons
What condition would cause a system to not respond to an expansion valve adjustment? correct
answers Oil in the evaporator
What would have the least effect on the capacity of a water cooled condenser? correct answers
The ambient air temperature
What is the volume occupied by a refrigerant under specified conditions of pressure and
temperature? correct answers Specific volume
,What should cooling tower water pH be maintained at? correct answers 8
The absolute Celsius scale is referred to by which temperature scale? correct answers Kelvin
Which devices control the high side float? correct answers Condenser and receiver
In Fahrenheit, what is the equivalent of -15 degrees Celsius? correct answers 5 degrees F
If you had a flooded evaporator, which type of metering device would you use? correct answers
Low side float
What is the formula used to determine the number of cycles of concentration for a cooling
tower? correct answers Cycles = Tower water chlorides / makeup water chlorides
What determines the low side pressure in a refrigeration system? correct answers The evaporator
flow rate
What seal is not used on a refrigeration system? correct answers Mechanical
What water chemistry test is used to determine cooling tower cycles of concentration? correct
answers Chlorides
What would happen if you had a sudden drop in the temperature in the cooling tower of a lithium
bromide absorption system? correct answers Crystallization in the system
Define the term "Refrigerant reclaiming" correct answers Chemically analyzing and distilling the
refrigerant; Reprocessing the refrigerant into a new product that can be reused; Selling
reprocessed refrigerant as reclaimed refrigerant
, Describe the term "free air" correct answers Air at atmospheric conditions
How is the setting on a thermostic expansion valve rated? correct answers Degrees of superheat
Describe the operation of a single acting compressor correct answers The refrigerant gas is
compressed on only one side of the piston
What would cause a noisy compressor? correct answers Lack of oil; dry or damaged seal; loose
drive coupling
Thermostatic expansion valves are rated in what units of measurement? correct answers Tons of
refrigeration
If a cooling tower has a pH of 7.8, it is: correct answers Slightly alkaline
Where would you find flash gas in an efficiently operating system? correct answers In the
evaporator
A cooling tower is circulating 2,850 GPM of water; what is the cooling capacity in tons? correct
answers 2,850/3 = 950 tons
What conditions can cause high discharge pressure in a system? correct answers Refrigerant
overcharge; an undersized condenser; insufficient cooling water to the condenser
What would frost on the suction line of a system using a high side floate indicate? correct
answers Overcharged system
What type of heat exchange occurs at the exterior sides of a cooling tower? correct answers
Convection
