500 Best Hydraulics MCQ

Q57). For critical depth of flow of water in open channels, the specific energy must be :

a).minimum
b).maximum
c).average of maximum and minimum
d).None of these.

Correct Answer:
minimum
Explanation:



Q58). If the forces are due to inertia and gravity, and frictional resistance plays only a minor role, the design of the channels is made by comparing

a).Reynold number
b).Froude number
c).Weber number
d).Mach number.

Correct Answer:
Froude number
Explanation:



Q59). The discharge over a Cipolletti weir of length 2.185 m when the head over the weir is 1 m, is

a).2.0 m3
b).2.5 m3
c).3.0 m3
d).4.0 m3

Correct Answer:
4.0 m3
Explanation:



Q60). The velocity of the fluid particle at the centre of the pipe section, is

a).minimum
b).maximum
c).equal throughout
d).none of these.

Correct Answer:
maximum
Explanation:



Q61). Due to decrease of diameter of the droplet, inside pressure intensity

a).increases
b).decreases
c).remains unaffected
d).None of these.

Correct Answer:
increases
Explanation:



Q62). In order to avoid capillary correction, the minimum diameter of a manometer used for measuring pressure, should be

a).2 mm
b).4 mm
c).6 mm
d).8 mm

Correct Answer:
6 mm
Explanation:



Q63). When water flows over a rectangular suppressed weir, the negative pressure created beneath the nappe

a).increases the discharge
b).decreases the discharge
c).does not effect the discharge
d).none of these.

Correct Answer:
increases the discharge
Explanation:



Q64). Barometres 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:
atmospheric pressure
Explanation:



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