500 Best Hydraulics MCQ

Q97). Most economical section of a triangular channel, is

a).equilateral triangle
b).right angled triangle
c).isosceles triangle with 45° vertex angle
d).right angled triangle with equal sides.

Correct Answer:
right angled triangle with equal sides.
Explanation:



Q98). In an open tube, free surface of mercury remains

a).horizontal
b).curved upwards
c).curved downwards
d).none of these.

Correct Answer:
curved downwards
Explanation:



Q99). The value of momentum correction factor (β) for a laminar flow through a circular pipe, is

a). 1/2
b). 2/3
c). 3/4
d). 4/3

Correct Answer:
4/3
Explanation:



Q100). Manometers are used to measure

a).pressure in water channels, pipes etc.
b).difference in pressure at two points
c).atmospheric pressure
d).very low pressure.

Correct Answer:
pressure in water channels, pipes etc.
Explanation:



Q101). For maximum horse power of a nozzle, the head supplied must be equal to

a).head loss in the pipe due to friction
b).twice the head loss in the pipe due to friction
c).thrice the head loss in the pipe due to friction
d).four times the head loss in the pipe due to friction.

Correct Answer:
thrice the head loss in the pipe due to friction
Explanation:



Q102). The ratio of frictional factor and coefficient of friction used in general equation for a head loss in a pipe, is

a).1
b).2
c).3
d).4

Correct Answer:
4
Explanation:



Q103). Flow in pipes is turbulent if Reynold number is

a).less than 2100
b).more than 3000
c).between 2100 and 3000
d).none of these.

Correct Answer:
more than 3000
Explanation:



Q104). Back water curve is caused if

a).friction head loss is more than the bed slope
b).pressure is due to weir in the channel
c).there is an increase in width of the channel
d).none of these.

Correct Answer:
pressure is due to weir in the channel
Explanation:



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