Top 550+ Solved Fluid Mechanics and Hydraulic Machines MCQ Questions Answer
Q. An equipotential line
a. Exists in case of rotational flow
b. Has uniformly varying dynamic pressure
c. Has no velocity component tangent to it
d. Exists in case of turbulent flow only
e. Has no velocity component normal to it
Q. The unit hydrograph may be obtained by dividing the ordinates of the direct run-off hydrograph of a storm by
a. total run off volume
b. duration of unit hydrograph
c. storm duration
d. direct run-off volume
Q. The stress in the dam should be within the specified limits for the body of dam in the foundations. If the stress at the toe and heel are excessive, they can be brought within permissible limits by
a. Grouting
b. Providing anchor blocks
c. Providing friction blocks
d. Providing filters
e. Any of the above
Q. Hammer blow in pipe occurs when
a. Flow of fluid through pipe is suddenly brought to rest by the closing of the valve
b. Pipe bursts under high fluid pressure
c. Flow of fluid through pipe is gradually brought to rest by the closing of valve
d. Excessive leakage occurs in pipe
e. Pipe is hit with hammer
Q. The loss of pressure head for the laminar flow through pipes varies
a. As the square of velocity
b. Directly as the velocity
c. As the inverse of the velocity
d. None of the above
e. None of the above
Q. The oscillatory motion of a ship or a boat about its longitudinal axis is designated as
a. Vibration
b. Pitching
c. Simple harmonic motion
d. Gyro-mtion
e. Rolling
Q. The surface tension has the units
a. Newtons/m
b. Newtons/m2
c. Newtons/m2
d. Newtons
e. None of the above
Q. A small-size nozzle is built into a Pelton turbine for directing its water jet towards the back of the bucket, so that machine can be stopped quickly, is known as
a. Reverse nozzle
b. Compensating nozzle
c. Brake nozzle
d. Any of the above
e. None of the above
Q. In case of Buttress dams, too steep slopes
a. Increase the tendency to sliding
b. Increase inclined stress at heel
c. Increase tendency to over turning
d. Increase tensile stress on upstream side of dam
e. Increase stresses at heels only
Q. The lift on the cylinder caused by the circulation is independent of
a. velocity
b. cylinder diameter
c. magnitude of circulation
d. None of the above
Q. Essentially the gravity dam resists the loads to which it is exposed, due to its
a. Volume
b. Size
c. Mass
d. Gravity
e. High tensile stress
Q. Identify the incorrect statement. Apparent shear forces
a. Depend upon molecular interchange of momentum
b. Can never occur in frictionless fluid regardless of its motion
c. May occur owing to cohesion when the fluid is at rest
d. Can never occur when the fluid is at rest
e. Depend upon cohesive forces
Q. An air vessel is provided at the summit in a syphone to
a. Maintain pressure difference
b. Increase velocity
c. Increase discharge
d. Avoid an interruption in the flow
e. Regulate the flow