Which of the following is not a common refrigerant ?

Related Mcqs:

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

   A. Freon
   B. Liquid sulphur dioxide
   C. Methyl chloride
   D. Ammonia

2. Which of the following is an undesirable characteristic of a refrigerant ?

   A. It should be non-explosive
   B. It should have a sub-atmospheric vapor pressure at the temperature in refrigerator coils
   C. Its vapor pressure at the condenser temperature should be very high
   D. None of these

3. An ideal liquid refrigerant should______________________?

   A. Not have a sub-atmospheric vapour pressure at the temperature in the refrigerator coils
   B. Not have unduly high vapour pressure at the condenser temperature
   C. Both A. and B
   D. Have low specific heat

4. Pick out the undesirable property for a good refrigerant ?

   A. High thermal conductivity
   B. Low freezing point
   C. Large latent heat of vaporisation
   D. High viscosity

5. High _____________ is an undesirable property for a good refrigerant?

   A. Specific heat
   B. Latent heat of vaporisation
   C. Viscosity
   D. Specific vapor volume

6. Which is not a refrigerant ?

   A. SO2
   B. NH3
   C. CCl2F2
   D. C2H4Cl2

7. In case of a reversible process (following pvn = constant), work obtained for trebling the volume (v1 = 1 m3 and v23 m3) is maximum, when the value of ‘n’ is_________________?

   A. 0
   B. 1
   C. y = 1.44
   D. 1.66

8. 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

9. Which of the following is not a unit of the equilibrium constant Kp? (where, Δx = number of moles of products number of moles of reactants) ?

   A. (atm)Δx, when Δx is negative
   B. (atm)Δx, when Δx is positive
   C. Dimensionless, when Δx = 0
   D. (atm)Δx2, when Δx > 0

10. Which of the following is a thermodynamic property of a system ?

    A. Concentration
    B. Mass
    C. Temperature
    D. Entropy