A. Water
B. Ammonia
C. Freon
D. Brine
Related Mcqs:
- The co-efficient of performance (COP) of a refrigerating system, which is its index of performance, is defined as the ratio of useful refrigeration to the net work. The units of _____________ and COP are the same?
A. Kinematic viscosity
B. Work
C. Temperature
D. None of these - Refrigerants commonly used for domestic refrigerators are_________________?
A. Ethyl chloride or methyl chloride
B. Freon-12
C. Propane
D. NH3 or CO2 - Noise level inside a jet airliner in normal flight is about ______________ decibels?
A. 80
B. 100
C. 125
D. 150 - 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 - For an incompressible fluid, the _______________ is a function of both pressure as well as temperature?
A. Internal energy
B. Enthalpy
C. Entropy
D. All (A), B. & (C) - In an ideal refrigeration cycle, the change in internal energy of the fluid is_____________?
A. +ve
B. -ve
C. 0
D. Either of the above three; depends on the nature of refrigerant - The internal energy of an incompressible fluid depends upon its_________________?
A. Pressure
B. Temperature
C. Both A. & B
D. Neither A. nor B - Gibbs free energy of a pure fluid approaches _____________ as the pressure tends to zero at constant temperature?
A. Infinity
B. Minus infinity
C. Zero
D. None of these - In a turbine, the fluid expands almost_________________?
A. Isothermally
B. Isobarically
C. Adiabatically
D. None of these - In fluid flow, and heat and mass transfer, one encounters (i) kinematic velocity (μ), (ii) molecular diffusivity (ζ) and thermal diffusivity (α). The units of these quantities are ?
A. μ , α and θ all have units of m/s
B. μ , α and θ all have units of m2/s
C. α and θ have units of m2/s, while μ has unit of m/s
D. α and θ have units of m/s, while μ has unit of m2/s
