An important characteristic of absorption system of refrigeration is__________________?

Related Mcqs:

1. 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

2. Ammonia-absorption refrigeration cycle requires__________________?

   A. very little work input
   B. maximum work input
   C. nearly same work input as for vapour compression cycle
   D. zero work input
   E. none of the above

3. Vapor compression refrigeration is some what like ____________________?

   A. Carnot cycle
   B. Rankine cycle
   C. reversed Camot cycle
   D. reversed Rankine cycle
   E. none of the above

4. Refrigeration in aeroplanes usually employs the following refrigerant___________________?

   A. Co2
   B. Freon-11
   C. Freon-22
   D. Air
   E. none of the above

5. A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of- 23°C. The Cannot coefficient of performance of cycle will be_________________?

   A. 0.2
   B. 1.2
   C. 5
   D. 6
   E. 10

6. In a refrigeration cycle, the flow of refrigerant is controlled by___________________?

   A. compressor
   B. condenser
   C. evaporator
   D. expansion valve
   E. all of the above

7. The leaks in a refrigeration system using Freon are detected by____________________?

   A. halide torch which on detection produces greenish flame lighting
   B. sulphur sticks which on detection gives white smoke
   C. using reagents
   D. smelling
   E. sensing reduction in pressure

8. Reducing suction pressure in refrigeration cycle_________________?

   A. lowers evaporation temperature
   B. increases power required per ton of refrigeration
   C. lowers compressor capacity because vapour is lighter
   D. reduces weight displaced by piston
   E. all of the above

9. The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is_________________?

   A. same
   B. more
   C. less
   D. more or less depending on ambient conditions
   E. unpredictable

10. For proper refrigeration in a cabinet, if the temperature and vapour pressure difference between cabinet and atmosphere is high, then_________________?

    A. bigger cabinet should be used
    B. smaller cabinet should be used
    C. perfectly tight vapour seal should be used
    D. refrigerant with lower evaporation temperature should be used
    E. refrigerant with high boiling point must be used