Top 550+ Solved Fluid Mechanics and Hydraulic Machines MCQ Questions Answer
Q. Air vessels in a reciprocating pump are fitted to
a. Increase the opening speed of pump
b. Reduce suction head
c. Reduce the acceleration head
d. Increase delivery head
e. Smoothen delivery head
Q. In axial flow turbine
a. It is possible to regulate the flow
b. It is necessary that wheel should always run full
c. Water admitted over part of the circumference
d. Depends upon other factors
e. Only part of the available head is converted into velocity before the water enters the wheel
Q. In which of the following cases it is possible for flow to occur from low pressure to high pressure?
a. Flow through a converging section
b. Adiabatic flow in a horizontal pipe
c. Flow of liquid in a vertical pipe
d. Flow of air downward in a pipe
e. None of the above
Q. The speed of a submariue can be measured by
a. Pitot tube
b. Hot wire anemometer
c. Pirani gauge
d. Inclined manometer
e. Any of the above
Q. In an open channel the discharge corresponding to critical depth is
a. Minimum
b. Maximum
c. Zero
d. Average
e. None of the above
Q. Bernoulli's theorem deals with the principle of conservation of
a. Force
b. Hydraulic pressure
c. Mass
d. Energy
e. Momentum
Q. Two units are homologous when they are geometrically similar and have
a. Same Reynolds number
b. Same efficiency
c. 51.3
d. Similar stream lines
e. Same Froudes number
Q. Buoyant force is
a. The resultant force acting on the body
b. Resultant force on the body due to the fluid surrounding it
c. Resultant of upthrust and gravity forces acting on the body
d. Resultant of static weight of body and dynamic thrust of fluid
e. Equal to the volume of liquid displaced by the body
Q. The upper critical Reynolds number is
a. Important from a design view point
b. Not more than 2000
c. The number at which turbulent flow changes to laminar flow
d. About 2000
e. Of no practical importance in pipe flow problems
Q. Abnormal load on a earth dam is
a. Weight of dam and structure above it
b. Water pressure corresponding to full reservoir level
c. Weight of the dam
d. Uplift
e. Wave pressure
Q. In a Buttress dam the inclination of the deck with horizontal is kept between
a. 25? to 30?
b. 35? to 40?
c. 15? to 20?
d. 60? to 75?
e. 10? to 15?
Q. In which of the following types of flow the losses are maximum?
a. Turbulent flow
b. Critical flow
c. Transition flow
d. Laminar flow
Q. Which type of pump is different from others?
a. Lobe pump
b. Gear pump
c. Fuel pump for diesel engine
d. Sliding vane pump
e. Centrifugal pump
Q. The velocity of a fluid particle at the centre of the pipe section is
a. Maximum
b. Minimum
c. Average
d. r.m.s.
e. Logarithmic averag
Q. The turbine that cannot be installed in high head plant is
a. Kaplan turbine
b. Francis turbine, vertical
c. Francis turbine, horizontal
d. Pelton wheel, horizontal
e. Pelton wheel, vertical