1. . The process of removing heat from objects in a control way in order to cool them is called:
(A) Refrigeration
(B) Air Conditioning
(C) Evaporation
(D) Condensation
2. . One ton is equal to the heat removal at the rate of:
(A) 64.4 K.Cal/min
(B) 56.4 K.Cal/min
(C) 40.4 K.Cal/min
(D) 50.4 K.Cal/min
3. . The refrigerants used in refrigeration should be:
(A) Non-corrosive and non-toxic
(B) All of the above
(C) Free from objectionable odor
(D) Non-inflammable
4. . A chemical mixture of chlorine, fluorine and carbon dioxide is called:
(A) Ammonia
(B) Methychloride
(C) Freon
(D) None of the above
5. . When the liquid refrigerant comes out from the capillary tube to evaporator, its pressure:
(A) None of these
(B) Rises
(C) Do not change
(D) Falls
6. . In the freezer compartment of a refrigerator, the temperature maintained is:
(A) 7°C to -15°C
(B) 0°C to -5°C
(C) 5°C to -7°C
(D) 20°C to -25°C
7. . The refrigerant vaporizes and absorbs latent heat from the surrounding in:
(A) Condenser
(B) Evaporator
(C) Receiver
(D) Compressor
8. . In the refrigerator, the function of thermostat is to maintain the requisite:
(A) Temperature
(B) Pressure
(C) Refrigerant level
(D) None of the above
9. . In room air conditioner, the condensers used are:
(A) Air-cooled
(B) Water-cooled
(C) Oil-cooled
(D) None of the above
10. . In air conditioner, filters are used to:
(A) Cool the air
(B) Clean the ice
(C) Clean the refrigerant
(D) Clean the air
11. . In a domestic refrigerator, the temperature maintained in the food cabinet is:
(A) 5°C to 10°C
(B) 5°C to -10°C
(C) 0°C to 10°C
(D) None of these
12. . Air conditioning is a process of simultaneous controlling of:
(A) Temperature and humidity
(B) Purity and flow of air
(C) Both a & b
(D) Temperature only
13. . When the starting relay in the electric circuit of a refrigerator fails to close:
(A) Motor will draw more current
(B) Motor speed will decrease
(C) Motor will not start
(D) Motor speed will increase
14. . Freon boils at the temperature of:
(A) 15°C when its pressure is 1.54 kg/cm²
(B) 20°C when its pressure is 1.54 kg/cm²
(C) 20°C when its pressure is 2.54 kg/cm²
(D) None of the above
15. . The unit of refrigeration:
(A) Meter
(B) Square Meter
(C) Ton
(D) None of these