Top 550+ Solved Fluid Mechanics and Hydraulic Machines MCQ Questions Answer
Q. The dam constructed on river chambal is
a. Jawaha Sagar
b. Rana Pratap Sagar
c. Gandhi Sagar
d. All of the above three
e. None of the above
Q. The oscillatory motion of a ship or a boat about its transverse axis is termed as
a. Rolling
b. Gyro-motion
c. Pitching
d. Transverse motion
e. Transverse harmonic motion
Q. A closed cubical box 0.8 m on each side is half filled with water and the other half being filled with oil of specific gravity 0.75. Now if the box is accelerated upwards at the rate of 4.905 m/sec2 the pressure difference in kg/m2 between the top and bottom layers would be
a. 981
b. 545.5
c. 490.5
d. 1050
e. 1800
Q. A vessel containing water moves downward with a constant acceleratin equal to 'q' then
a. the pressure throughout the liquid mass will be atmospheric
c. the liquid mass will be under a pressure double the atmospheric pressure
d. the liquid mass will be in turbulence
e. the liquid mass will be under a pressure below the atmospheric pressure
Q. The centre of buoyancy always coincides with
a. centre of gravity of the body
b. centroid of the volume displaced
c. metacentre
d. None of the above
Q. Alcohol is used in manometers because
a. It provides a suitable meniscus for the inclined tube
b. Its density being less can provide longer length for a pressure difference, thus more accuracy can be obtained
c. (A) and (B) above
d. Cheap and easily availale
e. Its vapour pressure is low
Q. A Kaplan turbine is suitable for
a. High head low discharge
b. High head high discharge
c. Low head low discharge
d. Low head high discharge
e. None of the above
Q. The viscosity of a fluid varies with
a. temperature and pressure
b. temperature
c. 51.3
d. density
e. pressure
Q. The Reynolds number for flow of 0.3 m3/s of oil sp. Gr. 0.86,
a. 29.2
b. 292
c. 2920
d. 22930
e. None of the above
Q. Type of impeller used in mud pumps is
a. Shrouded
b. One side shrouded
c. Open
d. Double suction
e. Any of the above
Q. In an isothermal atmosphere
a. Pressure varies in the same way as density
b. Pressure is constant all over
c. Pressure decreases linearly with elevation
d. Pressure varies exponentially with density
e. Pressure increases directly as the square of height
Q. The critical depth on a channel is given by
a. h = v2/g
b. h = v2/2g
c. h = v/g
d. h = 2v/g
e. h = v/2g