**801. A Rotameter works on the principle of _______________ pressure drop?**

A. Constant**B. Variable**

C. Both A. & B.

D. Neither A. nor B.

**802. Where does the maximum stress occur in case of laminar flow of incompressible fluid in a closed conduit of diameter ‘d’ ?****A. At the centre**

B. At d/4 from the wall

C. At the wall

D. At d/8 from the wall

**803. Upto what value of ‘Mach number’, a fluid may be considered as incompressible ?**

A. 0.03

B. 0.3**C. 3**

D. 10

**804. The variable required to be known in correlations used for estimating the horse power of a centrifugal gas compressor and hence its cost is P. Inlet pressure Q. Compressor rpm R. Delivery pressure S. Volumetric flow rate at inlet ?**

A. P, Q and R**B. P and R**

C. R and S

D. P, Rand S

**805. Priming is needed in a ______________ pump?**

A. Reciprocating

B. Gear**C. Centrifugal**

D. Diaphragm

**806. Higher specific speed (200-500) of a centrifugal pump indicates that the pump is of ______________ flow type?****A. Axial**

B. Radial

C. Mixed

D. None of these

**807. Which of the following properties of a fluid is responsible for offering resistance to shear ?**

A. Surface tension**B. Viscosity**

C. Specific gravity

D. All A., B., and C.

**808. In centrifugal pump operation, the cavitation can be eliminated by maintaining suction pressure ______________ the vapor pressure of the liquid at the suction temperature?**

A. Lower than**B. Higher than**

C. Equal to

D. None of these

**809. The pressure head on sudden contraction in a horizontal pipe is converted into the _____________ head?**

A. Elevation**B. Velocity**

C. Both A. & B.

D. Neither A. nor B.

**810. The ratio of inertial forces to elastic forces is called the __________ number?**

A. Reynolds

B. Mach

C. Euler

D. Weber

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