Practice Test: Question Set - 19
1. In aqua ammonia absorption refrigeration system, incomplete rectification leads to accumulation of water in
- (A) Condenser
- (B) Evaporator
- (C) Absorber
- (D) None
of these
2. Most air cooled condensers are designed to operate with a temperature difference of
- (A) 5°C
- (B) 8°C
- (C) 14°C
- (D) 22°C
3. In a reversed Brayton cycle, the heat is absorbed by the air during
- (A) Isentropic
compression process
- (B) Constant
pressure cooling process
- (C) Isentropic
expansion process
- (D) Constant
pressure expansion process
4. Wet bulb temperature is the temperature of air recorded by a thermometer, when
- (A) It
is not affected by the moisture present in the air
- (B) Its bulb is
surrounded by a wet cloth exposed to the air
- (C) The
moisture present in it begins to condense
- (D) None
of the above
5. The difference between dry bulb temperature and dew point temperature, is called
- (A) Dry
bulb depression
- (B) Wet
bulb depression
- (C) Dew
point depression
- (D) Degree
of saturation
6. In mechanical refrigeration system, the refrigerant has the maximum temperature
- (A) In
evaporator
- (B) Before
expansion valve
- (C) Between
compressor and condenser
- (D) Between
condenser and evaporator
7. The central air conditioning system has ___________ overall efficiency as compared to individual systems.
- (A) Same
- (B) Lower
- (C) Higher
- (D) None
of these
8. Moisture should be removed from refrigerants to avoid
- (A) Freezing
at the expansion valve
- (B) Restriction
to refrigerant flow
- (C) Corrosion
of steel plates
- (D) All
of these
9. The specific humidity during humidification process
- (A) Remains
constant
- (B) Increases
- (C) Decreases
- (D) None
of these
10. During a refrigeration cycle, heat is rejected by the refrigerant in a
- (A) Compressor
- (B) Condenser
- (C) Evaporator
- (D) Expansion
valve
11. In a vapour compression system, the condition of refrigerant is dry saturated vapour
- (A) Before
entering the compressor
- (B) After
leaving the compressor
- (C) Before
entering the condenser
- (D) After
leaving the condenser
12. During sensible cooling of air, specific humidity
- (A) Remains
constant
- (B) Increases
- (C) Decreases
- (D) None
of these
13. In a psychrometric chart, specific humidity (moisture content) lines are
- (A) Vertical
and uniformly spaced
- (B) Horizontal
and uniformly spaced
- (C) Horizontal
and non-uniformly spaced
- (D) Curved lines
14. The horizontal and non-uniformly spaced lines on a psychrometric chart indicates
- (A) Dry
bulb temperature
- (B) Wet
bulb temperature
- (C) Dew
point temperature
- (D) Specific
humidity
15. In a vapour compression refrigeration system, a throttle valve is used in place of an expander because
- (A) It
considerably reduces mass of the system
- (B) It
improves the C.O.P., as the condenser is small
- (C) The
positive work in isentropic expansion of liquid is very small
- (D) It
leads to significant cost reduction
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