Practice Test: Question Set - 02
1. The COP of a vapour compression plant in comparison to vapour absorption plant is
- (A) More
- (B) Less
- (C) Same
- (D) More/less depending
on size of plant
2. The fluids used in Electrolux refrigerator are
- (A) Water
and hydrogen
- (B) Ammonia
and hydrogen
- (C) Ammonia,
water and hydrogen
- (D) None
of these
3. Domestic refrigerator working on vapour compression cycle uses the following type of expansion device
- (A) Electrically operated
throttling valve
- (B) Manually operated
valve
- (C) Thermostatic valve
- (D) Capillary tube
4. The condition of refrigerant after passing through the expansion or throttle valve, in a vapour compression system is
- (A) High
pressure saturated liquid
- (B) Wet
vapour
- (C) Very
wet vapour
- (D) Dry vapour
5. An important characteristic of absorption system of refrigeration is
- (A) Noisy operation
- (B) Quiet operation
- (C) Cooling below 0°C
- (D) Very little power
consumption
6. The centrifugal compressors are generally used for refrigerants that require
- (A) Small
displacements and low condensing pressures
- (B) Large
displacements and high condensing pressures
- (C) Small
displacements and high condensing pressures
- (D) Large
displacements and low condensing pressures
7. Rick up the incorrect statement
- (A) Lithium bromide used
in vapour absorption cycle is non volatile
- (B) Lithium bromide plant can't operate below
0°C
- (C) A separator is used
in lithium bromide plant to remove the unwanted water vapour by condensing
- (D) Concentration of solution coming out of
lithium bromide generator is more in comparison to that entering the generator
8. During dehumidification process, the relative humidity
- (A) Remains
constant
- (B) Increases
- (C) Decreases
- (D) None of
these
9. The refrigerant widely used in domestic refrigerators is
- (A) Ammonia
- (B) Carbon
dioxide
- (C) Sulphur
dioxide
- (D) R-12
10. The moisture in a refrigerant is removed by
- (A) Evaporator
- (B) Safety relief valve
- (C) Dehumidifier
- (D) Driers
11. During sensible cooling of air ________ decreases.
- (A) Wet
bulb temperature
- (B) Relative
humidity
- (C) Dry
bulb temperature
- (D) Specific
humidity
12. At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant
- (A) Decreases
- (B) Increases
- (C) Remain same
- (D) Depends on other
factors
13. The wet bulb depression is zero when relative humidity is
- (A) Zero
- (B) 0.5
- (C) 0.75
- (D) 1.0
14. The C.O.P of a refrigeration cycle with increase in evaporator temperature, keeping condenser temperature constant, will
- (A) Increase
- (B) Decrease
- (C) Remain unaffected
- (D) May increase or decrease depending on the
type of refrigerant used
15. During humidification process, dry bulb temperature
- (A) Remains
constant
- (B) Increases
- (C) Decreases
- (D) None
of these
Next Tests: