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
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

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