681. The dimension of surface tension is________________?
A. ML-2
B. MT-2
C. MLT-2
D. ML-2T

682. Water flow rate in a pipe of 3.5 metres diameter can be most economically and conveniently measured by a/an ________________?
A. Pitot tube
B. Venturimeter
C. Orificemeter
D. Rotameter

683. Maintenance cost of a ______________ pump for a particular duty is the least?
A. Centrifugal
B. Reciprocating
C. Volute
D. Gear

684. Cavitation in a pump creates so many undesirable effects. Out of the following, which is not an undesirable effect created by cavitation ?
A. Decrease in effect
B. Increase in thrust
C. Develops noise
D. Develops high pressure

685. Cd is always ______________ Cc?
A. Greater than
B. Less than
C. Equal to
D. Either more or less than

686. Which of the following options will facilitate the achievement of a very high head (say 30 metres) in case of a centrifugal pump ?
A. Increasing the impeller speed and the volute area
B. Increasing the number of vanes in the impeller
C. Mounting of two or more impellers in series on a single shaft
D. Either of A., B. or C.

687. Working of a _______________ pump characterises mixed flow?
A. Turbine
B. Piston
C. Diaphragm
D. None of these

688. Drag co-efficient in hindered settling is _____________ that in free settling?
A. Less than
B. Equal to
C. Not necessarily greater than
D. Always greater than

689. In case of Venturimeter, friction losses are about _____________ percent of maximum velocity head?
A. 2
B. 8
C. 12
D. 20

690. Friction produced by the formation of wakes is called the ______________ friction?
A. Disk
B. Skin
C. Form
D. None of these

NOTE
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