For obtaining high COP, the pressure range of compressor should be_______________?

Related Mcqs:

1. For better COP of refrigerator, the pressure range corresponding to temperature in evaporator and condenser must be____________________?

   A. small
   B. high
   C. euqal
   D. anything
   E. under some conditions small and under some conditions high

2. Allowable pressure on high-pressure side or ammonia absorption system is of the order of_________________?

   A. atmospheric pressure
   B. slightly above atmospheric pressure
   C. 2-4 bars
   D. 5-6 bars
   E. 7-10 bars

3. The COP of a domestic refrigerator___________________?

   A. is less than 1
   B. is more than 1
   C. is equal to 1
   D. depends upon the make
   E. depends upon the weather conditions

4. The value of COP in vapour compression cycle is usually__________________?

   A. always less than unity
   B. always more than unity
   C. equal to unity
   D. any one of the above
   E. none of the above

5. Efficiency of a Carnot engine is given as 80%. If the- cycle direction be reversed, what will be the value of COP of reversed Carnot cycle_________________?

   A. 1.25
   B. 0.8
   C. 0.5
   D. 0.25
   E. none of the above

6. If a heat pump cycle operates between the condenser temperature of +27°C and evaporator temperature of – 23°C, then the Carnot COP will be_________________?

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

7. The COP of a vapor compression plant in comparison to vapor absorption plant is ________________?

   A. more
   B. less
   C. same
   D. more/less depending on size of plant
   E. unpredictable

8. The domestic refrigerator uses following type of compressor ____________________?

   A. centrifugal
   B. axial
   C. miniature sealed unit
   D. piston type reciprocating
   E. none of the above

9. In a flooded evaporator refrigerator, an accumulator at suction of compressor is used to___________________?

   A. collect liquid refrigerant and prevent it from going to compressor
   B. detect liquid in vapour
   C. superheat the vapour
   D. collect vapours
   E. increase refrigeration effect

10. The suction pipe diameter of refrigerating unit compressor in comparison to delivery side is_________________?

    A. bigger
    B. smaller
    C. equal
    D. smaller/bigger depending on capacity
    E. unpredictable