Critical temperature is’ the temperature above which _____________________?

Related Mcqs:

1. A standard ice point temperature corresponds to the temperature of ___________________?

   A. water at 0°C
   B. ice at – 4°C
   C. solid and dry ice
   D. mixture of ice, water and vapour under equilibrium conditions under NTP conditions
   E. mixture of ice and water Under equilibrium conditions

2. 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

3. 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

4. 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

5. The change in evaporator temperature in a refrigeration cycle, as compared to change in condenser temperature, influences the value of C.O.P_____________________?

   A. more
   B. less
   C. equally.
   D. unpredictable
   E. none of the above

6. The C.O.P. of a refrigeration cycle with lowering of condenser temperature, keeping the evaporator temperature constant, will__________________?

   A. increase
   B. decrease
   C. may increase or decrease depending on the type of refrigerant used
   D. remain unaffected
   E. unpredictable

7. If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. of compressor required will be________________?

   A. same
   B. more
   C. less
   D. more/less depending on rating
   E. unpredictable

8. Critical pressure of a liquid is the pressure_________________?

   A. above which liquid will remain liquid
   B. above which liquid becomes gas
   C. above which liquid becomes vapour
   D. above which liquid becomes solid
   E. at which all the three phases exist together

9. A refrigerant should have _____________________?

   Pick up the wrong statement ?
   A. Tow specific heat of liquid
   B. high boiling point
   C. high latent heat of vaporisation
   D. higher critical temperature
   E. low specific volume of vapour

10. In vapour compression cycle the condition of refrigerant is superheated vapour _____________________?

    A. after passing through the condenser
    B. before passing through the condenser
    C. after passing through the expansion or throttle valve
    D. before [entering the expansion valve
    E. before entering the compressor