A. decreases
B. increases
C. remains same
D. depends on other factors
E. none of the above
Related Mcqs:
- Which of the following is not a desirable property of a refrigerant_________________?
A. high triiscibility with oil
B. low boiling point
C. good electrical conductor
D. large latent heat
E. non-inflammable - The condensing pressure due to the presence of non-condensable gases, as compared to that actually required for condensing temperatures without non-condensable gases ____________________ ?
A. will be higher
B. will be lower
C. will remain unaffected
D. may be higher or lower depending upon the nature of non-condensable gases
E. unpredictable - In a refrigeration system, heat absorbed in comparison to heat rejected is_________________?
A. more
B. less
C. same
D. more for small capacity and less for high capacity
E. less for small capacity and more for high capacity - The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy-diagram represents_____________________?
A. condensation of the refrigerant vapour
B. evaporation of the refrigerant liquid
C. compression of the refrigerant vapour
D. metering of the refrigerant liquid
E. none of the above - 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 - The evolution of heat of solution takes place in ammonia absorption plant when _____________________?
A. ammonia vapour goes into solution
B. ammonia vapour is driven out of solution
C. lithium bromide mixes with ammonia
D. weak solution mixes with strong solution
E. lithium bromide is driven out of solution - Pick up the correct statement about giving up of heat from one medium to other in ammonia absorption system ?
A. strong solution to weak solution
B. weak solution to strong solution
C. strong solution to ammonia vapour
D. ammonia vapour to weak solution
E. ammonia vapour to strong solution - In S.J. unit, one ton of refrigeration is equal to___________________?
A. 210 kJ/min
B. 21 kJ/min
C. 420 kJ/min
D. 840 kJ/min
E. 105 kJ/min - In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be_________________?
A. high, of the order of 25°
B. as low as possible (3 to 11°C)
C. zero
D. any value
E. none of the above - Under-cooling in a refrigeration cycle_________________?
A. increases COP
B. decreases COF
C. COP remains unaltered
D. other factors decide COP
E. unperdictable
