500 Best Hydraulics MCQ

Q73). For the flow of liquid from an open ended tube (or nozzle) leading to the formation of spray of liquid drops, the number generally applied, is

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

Correct Answer:
Weber number
Explanation:



Q74). An error of 1% in measuring the head of water over the crest of a triangular notch, produces an error in the discharge which is equal to

a).0.0125
b).0.015
c).2.0%.
d).0.025

Correct Answer:
0.025
Explanation:



Q75). To avoid vapourisation, pipe lines are laid over the ridge so that these are above the hydraulic gradient line, not more than

a).2.4 m
b).6.4 m
c).10 m
d).5 m

Correct Answer:
6.4 m
Explanation:



Q76). A jet projected at an angle of 45θ, 40 m from the foot of a vertical column, just reaches the top of the column. The height of the column is

a).15 m
b).20 m
c).30 m
d).40 m

Correct Answer:
40 m
Explanation:



Q77). Atmospheric pressure varies with

a).altitude
b).temperature
c).weather conditions
d).all of the above.

Correct Answer:
all of the above.
Explanation:



Q78). The magnitude of water hammer in a pipe depends upon

a).speed at which value is closed
b).length of the pipe line
c).elastic properties of the pipe material
d).all of the above.

Correct Answer:
all of the above.
Explanation:



Q79). If velocities of fluid particles vary from point to point in magnitude and direction, as well as from instant to instant, the flow is said to be

a).laminar
b).turbulent flow
c).uniform flow
d).non-uniform flow.

Correct Answer:
turbulent flow
Explanation:



Q80). The rise of the liquid along the walls of a revolving cylinder above the initial level, is

a).greater than the depression of the liquid at the axis of rotation
b).lesser than the depression of the liquid at the axis of rotation
c).the same as the depression of the liquid at the axis of rotation
d).none of these.

Correct Answer:
the same as the depression of the liquid at the axis of rotation
Explanation:



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