Refrigeration in aeroplanes usually employs the following refrigerant___________________?

Related Mcqs:

1. Absorption system normally uses the following refrigerant___________________?

   A. Freon-11
   B. Freon-22
   C. C02
   D. S02
   E. ammonia

2. One ton of refrigeration is equal to the refrigeration effect corresponding to melting of 1000 kg of ice_________________?

   A. in 1 hour
   B. in 1 minute
   C. in 24 hours
   D. in 12 hours
   E. in 10 hours

3. The vapor compression refrigerator employs the following cycle_________________?

   A. Rankine
   B. Carnot
   C. Reversed Rankine
   D. Brayton
   E. Reversed Carnot

4. Aqua ammonia is used as refrigerant in the following type of refrigeration system_________________?

   A. compression
   B. direct
   C. indirect
   D. absorption
   E. none of the above

5. Most of the domestic refrigerators work on the following refrigeration system _________________?

   A. vapour compression
   B. vapour absorption
   C. carnot cycle
   D. electrolux refrigerator
   E. dual cycle

6. The general rule for rating refrigeration systems (excepting for C02 system) is to approximate following h.p. per ton of refrigeration__________________?

   A. 0.1 to 0.5 h.p. per ton of refrigeration
   B. 0.5 to 0.8 h.p. per ton of refrigeration
   C. 1 to 2 h.p. per ton of refrigeration
   D. 2 to 5 h.p. per ton of refrigeration
   E. 5 to 10 h.p. per ton refrigeration

7. Air refrigeration cycle is used in ____________________?

   A. domestic refrigerators
   B. commercial refrigerators
   C. air conditioning
   D. gas liquefaction
   E. such a cycle does not exist

8. 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
   E. unpredictable

9. One ton of the refrigeration is_________________?

   A. the standard unit used in refrigeration problems
   B. the cooling effect produced by melting 1 ton of ice
   C. the refrigeration effect to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours
   D. the refrigeration effect to produce 1 ton of ice at NTP conditions
   E. the refrigeration effect to produce 1 ton of ice in 1 hour time

10. Highest pressure encountered in a refrigeration system should be________________?

    A. critical pressure of refrigerant
    B. much below critical pressure
    C. much above critical pressure
    D. near critical pressure
    E. there is no such restriction