Practice Test: Question Set - 07
1. Freon group of refrigerants are
- (A) Inflammable
- (B) Toxic
- (C) Non-inflammable and
toxic
- (D) Nontoxic and
non-inflammable
2. The boiling point of ammonia is
- (A) -10.5°C
- (B) -30°C
- (C) -33.3°C
- (D) -77.7°C
3. For obtaining high COP, the pressure range of compressor should be
- (A) High
- (B) Low
- (C) Optimum
- (D) Any value
4. A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be
- (A) 1.33
- (B) 2.33
- (C) 3.33
- (D) 4.33
5. Cooling water is required for following equipment in ammonia absorption plant
- (A) Condenser
- (B) Evaporator
- (C) Absorber
- (D) Condenser, absorber and separator (rectifier)
6. The freezing point of sulphur dioxide is
- (A) -56.6°C
- (B) -75.2°C
- (C) -77.7°C
- (D) -135.8°C
7. Mass flow ratio of NH₃ in comparison to Freon-12 for same refrigeration load and same temperature limits is of the order of
- (A) 1: 1
- (B) 1: 9
- (C) 9: 1
- (D) 1: 3
8. In a refrigeration system, the expansion device is connected between the
- (A) Compressor
and condenser
- (B) Condenser
and receiver
- (C) Receiver
and evaporator
- (D) Evaporator
and compressor
9. The vapour compression refrigerator employs the following cycle
- (A) Rankine
- (B) Carnot
- (C) Reversed Rankine
- (D) Reversed Carnot
10. In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature of 40° C and an evaporator temperature of 5° C, the heat rejection factor is about
- (A) 1
- (B) 1.25
- (C) 2.15
- (D) 5.12
11. Rating of a domestic refrigerator is of the order of
- (A) 0.1 ton
- (B) 5 tons
- (C) 10 tons
- (D) 40 tons
12. A human body feels comfortable when the heat produced by the metabolism of human body is equal to the
- (A) Heat
dissipated to the surroundings
- (B) Heat
stored in the human body
- (C) Sum of (A)
and (B)
- (D) Difference
of (A) and (B)
13. The bank of tubes at the back of domestic refrigerator is
- (A) Condenser tubes
- (B) Evaporator tubes
- (C) Refrigerant cooling tubes
- (D) Capillary tubes
14. In a lithium bromide absorption refrigeration system
- (A) Lithium
bromide is used as a refrigerant and water as an absorbent
- (B) Water
is used as a refrigerant and lithium bromide as an absorbent
- (C) Ammonia
is used as a refrigerant and lithium bromide as an absorbent
- (D) None
of the above
15. The condition of refrigerant after passing through the condenser in a vapour compression system is
- (A) Saturated
liquid
- (B) Wet vapour
- (C) Dry
saturated vapour
- (D) Superheated
vapour
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