**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

**NOTEIF YOU THINK ANY OF THE MCQ ABOVE IS WRONG.PLEASE COMMENT WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION IN COMMENT BOX.THANK YOU**