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11 . The normal stress is the same in all directions at a point in a fluid, when the fluid is
A. non-viscous.
B. incompressible
C. both (a) and (b).
D. having no motion of one fluid layer relative to the other.

12 . Head developed by a centrifugal pump depends on its
A. speed
B. impeller diameter
C. both (a) and (b)
D. neither (a) nor (b)

13 . Hydraulic mean depth (Dm) for a circular pipe of diameter 'D' flowing full is 0.25 D. For a circular channel, at Dm = 0.3 D, gives the condition for the maximum
A. flow rate
B. mean velocity
C. both 'a' & 'b'
D. neither 'a' nor 'b'

14 . The head loss in turbulent flow in a pipe varies
A. as velocity
B. as (velocity)2
C. inversely as the square of diameter
D. inversely as the velocity

15 . Most commonly used joint in the underground pipe lines is the
A. sleevejoint
B. coupling
C. flange
D. expansion joint