A. Low
B. High
C. Minimum
D. Maximum
Ans -: B
Q.2 The maximum temperature of a refrigerant at which it can be condensed into liquid known as ____ .
A. Boiling temperature
B. Desirable temperature
C. Critical temperature
D. Refrigeration temperature
Ans -: C
Q.3 Refrigeration compressor designed to oprate with R22 refrigerant and can't be oprated with R12 , because Condensing pressure of R22 at any given temperature is ________ than that of R12.
A. Higher
B. Lower
C. Equal
D. None of these
Ans-: A
Q.4 What is the name of combined process of cooling and humidifying ?
A. Vaporisation
B. Condensation
C. Evaporative cooling
D. None of these
Ans -:C
Q.5 What is the value of sensible heat factor for humidification or dehumidification process ?
A. 1.5
B. 2
C. 1.5
D. Zero
Ans -: D
Q.6 In gas refrigeration cycle, ______ cycle is used .
A. Compression cycle
B. Bell-coleman / Brayton cycle
C. Expansion cycle
D. Evaporation cycle
Ans -: B
Q.7 Which refrigeration cycle is used in aircraft?
A. Water refrigeration cycle
B. Air refrigeration cycle
C. A + B
D. None of these
Ans -: B
Q.8 How can we detect leakage of Freon in a refrigeration system?
A. Using freon detector
B. Using a halide torch
C. Using Freon meter
D. All of the above
Ans -: B
Q.9 One tone of refrigeration is equal to ___ .
A. 3.5 kW
B. 4.5 kW
C. 1.15 kW
D. 5.2 kW
Ans -: A
Q.10 In a refrigerant moisture is removed by which device?
A. Dehumidifier
B. Evaporator
C. Heat exchanger
D. Driers
Ans -: D
Q.11 In domestic refrigerator back side tubes are used , are known as _____ .
A. Capillary tube
B. Evaporating tube
C. Condenser tube
D. None of these
Ans -: C
Q.12 The coefficient of performance of a domestic refrigerator is ____.
A. More than 1
B. Less than 1
C. 100 %
D. Zero
Ans-: A
Q.13 In which type of refrigeration system only have droplets of liquid in the evaporator?
A. Flooded type
B. Dry type
C. Low side float system
D. Capillary tube type
Ans -: B
Q.14 The rate at which refrigeration is produced and is expressed in tons of refrigeration known as _____ .
A. Power of refrigerator
B. Capacity of refrigerator
C. C.O.P. of refrigerator
D. None of these
Ans -: B
Q.15 At -15° C carbon dioxide ( CO2 ) has low specific volume in order of _____ .
A. 0.52 m^2/ kg
B. 0.016 m^3/ kg
C. 0.025 m^3 / kg
D. 1.57 m^2 / kg
Ans -: B
Q.16 As compared to ammonia, freon-12 has _____ specific volume.
A. Large
B. Same
C. Small
D. Very high
Ans -: C
Q.17 Absorption system normally uses which refrigerant?
A. CO2
B. SO2
C. Ammonia
D. CFC
Ans -: C
Q.18 In ammonia absorption plant, cooling water is required for which equipment?
A. Absorber
B. Condenser
C. Separator
D. All of the above
Ans -: D
Q.19 Generally oil separator is installed between _____ in refrigeration system.
A. Compressor and condenser
B. Evaporator and flow control device
C. Compressor and Evaporator
D. None of these
Ans -: A
Q.20 What is the use of brine agitator in ice plant ?
A. Increase COP
B. Increasing refrigeration effect
C. Obtain uniform temperature of brine
D. All of the above
Ans -: C
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