Book 2: 4-17 - "Compression Refrigeration Systems:" Flashcards
In the compression refrigeration system to condense the low-pressure, low-temperature vapour back to a liquid the _____ absorbed in the evaporator must be removed.
Select one:
A. Latent heat
B. Latent temperature
C. Sensible heat
D. Enthalpy
E. Sensible temperature
A. Latent heat
As a general rule, in the compression refrigeration system the condensing temperature of the vapour will be approximately _______ higher than the temperature of the water when a water-cooled condenser is used.
Select one:
A. 15°C (59°F)
B. 11°C (20°F)
C. 5°C (41°F) to 10°C (50°F)
D. 20°C (68F) to 25°C (77°F)
E. 0°C (32°F) to 5°C (41°F)
B. 11°C (20°F)
The high-pressure side of the compression refrigeration system consists of all except the:
Select one:
A. Upstream side of the regulating valve
B. Condenser
C. Compressor discharge
D. Receiver
E. Evaporator
E. Evaporator
In the compression refrigeration system the low-pressure, low-temperature liquid/vapour mixture flows through the _____, absorbing heat from the surrounding medium.
Select one:
A. Regenerator
B. Compressor
C. Absorber
D. Evaporator
E. Condenser
D. Evaporator
In air conditioning systems the air is not cooled any lower than:
Select one:
A. 13°C (55°F)
B. 10°C (50°F)
C. 25°C (77°F)
D. 15°C (59°F)
E. 18°C (64°F)
A. 13°C (55°F)
In the compression refrigeration system the work done on the vapour during compression will cause an increase in the temperature of the vapour to a value that is higher than the saturation temperature corresponding to the vapours pressure. The condition of the vapour is said to be:
Select one:
A. Sub cooled
B. Superheated
C. Super cooled
D. Super saturated
E. Super tempered
B. Superheated
Which of the following is not a principle component of a simple closed-cycle compression refrigeration system ?
Select one:
A. Liquid refrigerant control or regulating valve
B. Condenser
C. Liquid receiver
D. Regenerator
E. Evaporator
D. Regenerator
The indirect compression refrigeration system is one in which a liquid, such as brine or water, is cooled by the:
Select one:
A. Regenerator
B. Condenser
C. Refrigerant
D. Evaporator
E. Absorber
C. Refrigerant
In the compression refrigeration system the high-pressure, superheated vapour is discharged into the condenser where it gives up, first, the:
Select one:
A. Sensible heat
B. Enthalpy
C. Sensible temperature
D. Latent temperature
E. Latent heat
A. Sensible heat
One of the classes of closed cycle mechanical refrigeration systems is the:
Select one:
A. Expansion system
B. Absorption system
C. Condensation system
D. Evaporation system
E. Regeneration system
B. Absorption system
What brine temperature is used when cooling an ice surface?
Select one:
A. -5°C (23°F)
B. -25°C (-13°F)
C. -50°C (-58°F)
D. -18°C (0°F)
E. -11°C (12°F)
E. -11°C (12°F)
The low-pressure side of the compression refrigeration system includes all except the:
Select one:
A. All interconnected tubing and piping
B. Suction of the compressor
C. Condenser
D. Downstream of the regulating valve
E. Evaporator
C. Condenser
In the compression refrigeration system a controlled amount of _____ refrigerant passes through the regulating valve into the evaporator.
Select one:
A. High-pressure, high-temperature vapour
B. High-pressure, low-temperature vapour
C. High-pressure, low-temperature liquid
D. Low-pressure, high-temperature liquid
E. High-pressure, high-temperature liquid
E. High-pressure, high-temperature liquid
One of the classes of closed cycle mechanical refrigeration systems is the:
Select one:
A. Condensation system
B. Regeneration system
C. Evaporation system
D. Expansion system
E. Compression system
E. Compression system
What is the term used to describe the device used on a centrifugal chiller to improve efficiency and provide an intercooling effect?
Select one:
A. Compressor
B. Expansion valve
C. Evaporator
D. Condenser
E. Economizer
E. Economizer
A simple closed-cycle compression refrigeration system does NOT contain which of the following principal components?
Select one:
A. Evaporator
B. Liquid receiver
C. Condenser
D. Absorber
E. Compressor
D. Absorber
In air conditioning systems the air is cooled by chilled water that is normally kept at or above:
Select one:
A. 5°C (41°F)
B. 0°C (32°F)
C. 10°C (50°F)
D. 15°C (59°F)
E. 13°C (55°F)
A. 5°C (41°F)
In the compression refrigeration system the low pressure in the evaporator causes part of the entering liquid to flash into vapour, using the excess _____ in the liquid as latent heat of vaporization so that the remaining liquid cools down to its boiling point for that pressure.
Select one:
A. Sensible heat
B. Sensible temperature
C. Latent temperature
D. Latent heat
E. Enthalpy
A. Sensible heat
In the closed cycle compression refrigeration system the compressor not only removes the vapour from the evaporator, but also keeps the pressure in the evaporator at a constant value, which gives the desired ________ temperature of the liquid refrigerant.
Select one:
A. Vaporization
B. Condensation
C. Expansion
D. Cooling
E. Regeneration
A. Vaporization
In the compression refrigeration system the pressure in the evaporator is kept low by the:
Select one:
A. Regenerator
B. Evaporator
C. Condenser
D. Compressor
E. Absorber
D. Compressor
