Which of the following is a widely used refrigerant in vapour compression refrigeration system (using large centrifugal compressor) ?

Related Mcqs:

1. Which of the following units is not present in both the vapor compression refrigeration system and absorption refrigeration system ?

   A. Expansion valve B. Condenser C. Refrigerator D. Compressor...

2. In vapour compression refrigeration system, if the evaporator temperature and the condenser temperatures are -13°C and 37°C respectively, the Carnot COP will be________________?

   A. 5.2 B. 6.2 C. 0.168 D. Data insufficient, can’t be found out...

3. In case of vapour compression refrigeration system, elevating the evaporator temperature (keeping the condenser temperature constant) results in_____________?

   A. Enhanced COP B. Decreased COP C. No change in the value of COP D. Increased or decreased COP; depending upon the type of refrigerant...

4. The effect of changing the evaporator temperature on COP as compared to that of changing the condenser temperature (in vapour compression refrigeration system) is__________________?

   A. Less pronounced B. More pronounced C. Equal D. Data insufficient, can’t be predicted...

5. Lowering of condenser temperature (keeping the evaporator temperature constant) in case of vapour compression refrigeration system results in__________________?

   A. Increased COP B. Same COP C. Decreased COP D. Increased or decreased COP; depending upon the type of refrigerant...

6. A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect ?

   A. Vapor compression cycle using expansion valve B. Air refrigeration cycle C. Vapor compression cycle using expansion engine D. Carnot refrigeration cycle...

7. Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is_____________________?

   A. Positive B. Negative C. Zero D. Infinity...

8. What is the value of maximum COP in case of absorption refrigeration, if refrigeration provided is at temperature, TR (where, T1 and T2 are source & surrounding temperatures respectively.) ?

   A. TR/(T2 – TR) × (T1 – T2)/T1 B. TR/(T2 – TR) × T1/(T1 – T2) C. TR/(T1 – TR) × (T1 – T2)/T1 D. None of these...

9. Air enters an adiabatic compressor at 300K. The exit temperature for a compression ratio of 3, assuming air to be an ideal gas (Y = Cp/Cv = 7/5) and the process to be reversible, is___________________?

   A. 300 × (32/7) B. 300 × (33/5) C. 300 × (333/7) D. 300 × (35/7)...

10. Vapour which is at a pressure smaller than the saturation pressure for the temperature involved is called a _____________ vapour?

    A. Superheated B. Desuperheated C. Non-condensable D. None of these...