CIRO Chapter 4 questions with verified
solutions
Given three coils operating at the same conditions, which have the same internal volume and external
surface area, which one would deliver a greater capacity?
A. Direct expansion
B. Flooded
C. Liquid recirculated
D. They are all equal - correct answer ✔✔1
Slopover to the compressor is minimized in the overfeed system because
A. Of the low side float
B. Of the liquid line design
C. Of the low pressure receiver
D. Of the liquid pump - correct answer ✔✔1
Liquid is forced out of the drum of a gas 'double pumper drum' system to the evaporator by means of
A. High pressure vapor
B. Bulb pressure in the power element
C. Evaporator pressure
D. Liquid line pressure - correct answer ✔✔1
In the double pumper drum system when one drum is filling the other drum is
A. Also filling
B. Venting
C. Developing gas pressure
D. Being emptied - correct answer ✔✔1
, The gravity flooded evaporator, in some applications, can have a higher recirculation ratio than overfeed
systems because of
A. The accumulator
B. Pumped flow
C. No expansion valve
D. Thermosiphon action - correct answer ✔✔1
When oil and liquid refrigerants separate, the characteristics are that
A. Oil settles to the bottom with ammonia and rises to the top with halocarbons
B. Oil migrates towards high pressure with ammonia and low pressure with halocarbons
C. Oil migrates towards low pressure with ammonia and high pressure with halocarbons
D. Oil rises toward the top with ammonia and settles to the bottom with halocarbons - correct answer
✔✔1
A 3:1 recirculation ratio means that the wet suction return line contains
A. 3 parts liquid, 1 part vapor
B. 1 part liquid, 3 parts vapor
C. 2 parts liquid, 1 part vapor
D. 4 parts liquid, 1 part vapor - correct answer ✔✔1
In a double pumper drum system what happens when the pumper drum is filled?
A. Liquid stops returning to the low pressure receiver
B. Flow is stopped from the high pressure receiver
C. The compressor shuts down
D. Flow from the low pressure receiver stops - correct answer ✔✔1
What happens to flash gas in a liquid overfeed liquid system
A. It goes directly through the low pressure receiver to the compressor
B. It goes directly to the evaporator
solutions
Given three coils operating at the same conditions, which have the same internal volume and external
surface area, which one would deliver a greater capacity?
A. Direct expansion
B. Flooded
C. Liquid recirculated
D. They are all equal - correct answer ✔✔1
Slopover to the compressor is minimized in the overfeed system because
A. Of the low side float
B. Of the liquid line design
C. Of the low pressure receiver
D. Of the liquid pump - correct answer ✔✔1
Liquid is forced out of the drum of a gas 'double pumper drum' system to the evaporator by means of
A. High pressure vapor
B. Bulb pressure in the power element
C. Evaporator pressure
D. Liquid line pressure - correct answer ✔✔1
In the double pumper drum system when one drum is filling the other drum is
A. Also filling
B. Venting
C. Developing gas pressure
D. Being emptied - correct answer ✔✔1
, The gravity flooded evaporator, in some applications, can have a higher recirculation ratio than overfeed
systems because of
A. The accumulator
B. Pumped flow
C. No expansion valve
D. Thermosiphon action - correct answer ✔✔1
When oil and liquid refrigerants separate, the characteristics are that
A. Oil settles to the bottom with ammonia and rises to the top with halocarbons
B. Oil migrates towards high pressure with ammonia and low pressure with halocarbons
C. Oil migrates towards low pressure with ammonia and high pressure with halocarbons
D. Oil rises toward the top with ammonia and settles to the bottom with halocarbons - correct answer
✔✔1
A 3:1 recirculation ratio means that the wet suction return line contains
A. 3 parts liquid, 1 part vapor
B. 1 part liquid, 3 parts vapor
C. 2 parts liquid, 1 part vapor
D. 4 parts liquid, 1 part vapor - correct answer ✔✔1
In a double pumper drum system what happens when the pumper drum is filled?
A. Liquid stops returning to the low pressure receiver
B. Flow is stopped from the high pressure receiver
C. The compressor shuts down
D. Flow from the low pressure receiver stops - correct answer ✔✔1
What happens to flash gas in a liquid overfeed liquid system
A. It goes directly through the low pressure receiver to the compressor
B. It goes directly to the evaporator
