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21 . Molten soap mass is transported by a __________ pump.
A. diaphragm B. reciprocating
C. gear D. centrifugal

22 . Which of the following denotes the effect of compressibility in fluid flow ?
A. Weber number
B. Mach number
C. Euler number
D. Reynolds number

23 . Nominal size of the discharge pipe of a pump is usually __________ the nominal size of the inlet pipe.
A. smaller than
B. larger than
C. same as
D. twice

24 . The terminal velocity of a small sphere settling in a viscous fluid varies as the
A. first power of its dimeter.
B. inverse of the fluid viscosity.
C. inverse square of the diameter.
D. square of the difference in specific weights of solid & fluid.

25 . If the discharge of a centrifugal pump is throttled, then its suction lift
A. increases
B. decreases
C. remains unchanged
D. data insufficient to predict