500 Best Hydraulics MCQ
Q41). The discharge through a 100 mm diameter external mouth piece fitted to the side of a large vessel is 0.05948 m3/s. The head over the mouth piece is
a).2 m
b).2.5 m
c).3.0 m
d).4.0 m.
Correct Answer:
4.0 m.
Explanation:
Q42). If cohesion between the molecules of a fluid is more than adhesion between the fluid and glass, the free level of fluid in a dipped glass tube will be
a).higher than the surface of liquid
b).same as the surface of liquid
c).lower than the surface of liquid
d).none of these.
Correct Answer:
lower than the surface of liquid
Explanation:
Q43). The continuity equation
a).expresses the relationship between work and energy
b).relates the momentum per unit volume between two points on a stream line
c).relates mass rate of flow along a stream line
d).requires that Newton’s second law of motion be satisfied at every point in fluid.
Correct Answer:
relates mass rate of flow along a stream line
Explanation:
Q44). Water displaced by a floating wooden block of density 0.75, 5 m long, 2 m wide and 3 m high, is
a).17.5 m3
b).20.0 m3
c).22.5 m3
d).25 km3
Correct Answer:
22.5 m3
Explanation:
Q45). In pipe lines, a surge tank is provided
a).to relieve the pressure due to water hammer
b).to provide additional water head
c).to overflow the pipe line when suddenly closed
d).to remove the frictional loss in pipe.
Correct Answer:
to relieve the pressure due to water hammer
Explanation:
Q46). Total head of a liquid particle in motion is the sum of
a).potential head and kinetic head
b).kinetic head and pressure head
c).potential head and pressure head
d).potential head, kinetic head and pressure head.
Correct Answer:
potential head, kinetic head and pressure head.
Explanation:
Q47). The velocity distribution of viscous fluid through a circular/pipe is :
a).hyperbolic
b).circular
c).parabolic
d).elliptical.
Correct Answer:
parabolic
Explanation:
Q48). Mercury is generally used in barometers because
a).its vaour pressure is practically zero
b).the height of the barometer will be less
c).it is a best liquid
d).both (a) and (b) above
Correct Answer:
both (a) and (b) above
Explanation: