302. If the pressure at the inlet of a pipe is 90 kg/cm h and the pressure drop over the pipe line is 10 kg/cm2, the efficiency of transmission is

A.0.666

B.0.777

C.0.555

D.0.888

303. The total frictional resistance to fluid flow is independent of

A.Density of fluid

B.Velocity

C.Pressure

D.Surface roughness

304. The velocity of fluid particle at the centre of pipe section is

A.Zero

B.Minimum

C.Maximum

D.Average of full section

305. Uniform flow occurs when

A.At every point the velocity vector is identical, in magnitude and direction, for any given instant

B.The flow is steady

C.Discharge through a pipe is constant

D.Conditions do not change with time at any point

306. Which of the following represents steady uniform flow

A.Flow through an expanding tube at an increasing rate

B.Flow through an expanding tube at constant rate

C.Flow through a long pipe at decreasing rate

D.Flow through a long pipe at constant rate

307. In the case of turbulent flow

A.It occurs in open channel

B.Shear stresses are more compared to laminar flow.

C.Velocity at boundary is zero

D.It is not possible to measure flow

308. For a siphon to work satisfactorily, the minimum pressure in the pipe as compared to vapour pressure of liquid should be

A.More

B.Less

C.Equal

D.Could be anything

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