Top 550+ Solved Fluid Mechanics and Hydraulic Machines MCQ Questions Answer
Q. As the temperature increases, the viscosity of a gas
b. increases, increases
c. decreases, decreases
d. increases, decreases
e. decreases, increases
Q. A cylinder is kept on a horizontal boundary past which an ideal fluid flows perpendicular to cylinder axis. It will then experience
a. Lift force in vertically downward direction
b. No lift force
c. Some lift force
d. Lift force depends on velocity of flow and mass of cylinder and its contents
e. Lift force in vertically upward direction
Q. Which one of the following is not a disadvantage due to a Buttress dam?
a. Problems arising out of large number of joints in the dam
b. Significance of volume changes of thin members
c. The structure being self-sealing, it is not sensitive to accidental rise in water level above the designed full supply level
d. Bearing stress of the foundtions are higher
e. Overflow arrangements
Q. The pressure inside a 4 cm dia hose is 700 kPa. If the water exits through 1 2 cm dia. Nozzle what velocity in m/s can be expected inside the hose?
a. 10.5
b. 9.7
c. 16.3
d. 20.4
e. 12.4
Q. Which of the following is the result of the formation of a region of low pressure developed on the downstream side due to separation of flow?
a. Vortex street
b. Wakes
c. Cavities
d. Holes
Q. Force on a flat stationary plate is
a. Velocity of jet before impact - velocity after impact
b. Difference in velocities of jet in the direction normal to plate
c. Mass of water x (difference in velocities of jet)
d. Mass of striking water x (velocity before impact in the direction normal to plate-velocity fter impact in the direction normal to plate).
e. None of the above
Q. Viscosity will be the most important property in which of the following case
a. Travel of a bullet through air
b. Formation of soap bubbles
c. Flow of castor oil through a pipe.
d. Water jet issuing from a fire hose
e. 1.25
Q. The flow of a fluid in a pipe takes place from
a. higher level to lower level
b. small end to large end
c. higher energy to lower energy
d. higher pressure to lower pressure
e. lower pressure to higher pressure
Q. The head over a 90? V-notch weir increases from 0.15 m to 0.3 m. The ratio of the new discharge to the original discharge is
a. 1.25
b. 4
c. 5.657
d. 2
e. 1.414
Q. The portion of the power canal which extends from the power house to the recepient water course, is known as
a. Tail race
b. Discharge channel
c. Exhaust
d. Tail surge channel
e. None of the above
Q. Nagarjuna Sugar dam has been constucted on river
a. Mabanadi
b. Cauvery
c. Krishna
d. Kali
e. Periyar
Q. The specific speed for axial flow turbine varies from
a. 0 - 45
b. 10 - 100
c. 80 - 200
d. 200 - 300
e. None of the above
Q. When a liquid rotates at a angular velocity above a vertical axis as a rigid body, the pressure intensity varies
a. inversely with radial distance
b. directly with radial distance
c. More than 20?
d. Directly with square of the radial distance
e. inversely with the square of radial distance