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Refrigeration and Air-Conditioning question paper

1.The condensing pressure due to the presence of non condemnable gases, as compared to that actually required for condensing temperatures without non condemnable gases,
will be higher
will be lower
will remain unaffected
may be higher or lower depending upon the nature of non condemnable gases
unpredictable.

2.The moisture in a refrigerant is removed by
evaporator
safety relief valve
dehumidifier
driers
expansion valve

3.Ammonia-absorption refrigeration cycle requires
very little work input
maximum work input
nearly same work input as for vapour compression cycle
zero work input
none of the above.

4.In vapour compression cycle, the condition of refrigerant is high pressure saturated liquid
after passing through the condenser
before passing through the condenser
after passing through the expansion or throttle valve
before entering the expansion valve
before entering the compressor.

5.In vapour compression cycle, the condition of refrigerant is very wet vapour
after passing through the condenser
before passing through the condenser
after passing through the expansion or throttle valve
before entering the expansion valve
before entering the compressor.

6.Critical temperature is' the temperature above which
a gas will never liquefy
a gas will immediately liquefy
water will evaporate
water will never evaporate
none of the above.

7.Clapeyron equation is a relation between
temperature, pressure and enthalpy
specific volume and enthalpy
temperature and enthalpy
temperature, pressure, and specific volume
temperature, pressure, specific value and enthalpy.

8.A standard ice point temperature corresponds to the temperature of
water at 0�C
ice at - 4�C
solid and dry ice
mixture of ice, water and vapour under equilibrium conditions under NTP conditions
mixture of ice and water Under equilibrium conditions.

9.In S.J. unit, one ton of refrigeration is equal to
210 kJ/min
21 kJ/min
420 kJ/min
840 kJ/min
105 kJ/min.

10.One ton of refrigeration is equal to the refrigeration effect corresponding to melting of 1000 kg of ice
in 1 hour
in 1 minute
in 24 hours
in 12 hours
in 10 hours.

11.In vapour compression cycle the condition of refrigerant is superheated vapour
after passing through the condenser
before passing through the condenser
after passing through the expansion or throttle valve
before [entering the expansion valve
before entering the compressor.

12.The boiling point of ammonia is
-100�C
-50�C
- 33.3�C
0�C
33.3�C.

13.Clapeyron equation is applicable for registration at
saturation point of vapour
saturation point of liquid
sublimation temperature
triple point
critical point.

14.In vapour compression cycle the condition off refrigerant is dry saturated vapour
after passing through the condenser
before passing through the condenser
after passing through the expansion or throttle valve
before entering the expansion valve
before entering the compressor..

15.The vapour compression refrigerator employs the following cycle
Rankine
Carnot
Reversed Rankine
Brayton
Reversed Carnot.