591. Lenz’s law results from the law of conservation of___________________?
A. Mass
B. Momentum
C. Energy
D. None of these

592. 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

593. One ton of refrigeration capacity is equivalent to the heat removal rate of____________________?
A. 50 kcal/hr
B. 200 BTU/hr
C. 200 BTU/minute
D. 200 BTU/day

594. Entropy, which is a measure of the disorder of a system, is__________________?
A. Independent of pressure
B. Independent of temperature
C. Zero at absolute zero temperature for a perfect crystalline substance
D. All A, B. & C

595. A refrigerator works on the principle of _____________ law of thermodynamics?
A. Zeroth
B. First
C. Second
D. Third

596. Gibbs free energy (G) is represented by, G = H – TS, whereas Helmholtz free energy, A. is given by, A = E – TS. Which of the following is the Gibbs-Helmholtz equation ?
A. [∂(G/T)/∂T] = – (H/T2)
B. [∂(A/T)/∂T]V = – E/T2
C. Both A. and B.
D. Neither A. nor B.

597. The hydraulic radius for flow in a rectangular duct of cross-sectional dimension H, W is___________________?
A. √(HW/π)
B. HW/2 (H + W)2
C. HW/4 (H + W)2
D. 2HW/(H + W)

598. When the head pumped against is less than the head of the fluid used for pumping, the usual device is a/an______________________?
A. Ejector
B. Blower
C. Injector
D. Airlift

599. Buckingham-π theorem states that in any physical problem including ‘n’ quantities having ‘m’ dimensions, the quantities can be arranged into _____________ independent dimensionless parameters?
A. m
B. n
C. n-m
D. n/m

600. A globe valve is the most suitable for applications, in which____________________?
A. Fluid flow control is required
B. Fluid contains dispersed solid particles
C. Valve is required to be either fully open or fully closed
D. One way flow is required

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