Q: For most economical rectangular section of a channel, the depth is kep

(a) :  one-fourth of the width
(b) :  three times the hydraulic radius
(c) :  half the width
(d) :  hydraulic mean depth
(e) :  None of these
Answer:  half the width

Q: If the Mach number for a fluid flow is less than 1, the flow is

(a) :  sonic
(b) :  supersonic
(c) :  sub-sonic
(d) :  all of these
(e) :  None of these
Answer:  sub-sonic

Q: Bernoulli's equation assumes that

(a) :  fluid is non-viscous
(b) :  fluid is homogeneous
(c) :  flow is steady
(d) :  ow is along the stream line
(e) :  all the above.
Answer:  all the above.

Q: In C.G.S. system the units of kinematic viscosity, is

(a) :  stoke
(b) :  poise
(c) :  dyne
(d) :  Newton
(e) :  None of these
Answer:  stoke

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