Top 550+ Solved Fluid Mechanics and Hydraulic Machines MCQ Questions Answer
Q. With reference to a centrifugal pump which of the following statements is incorrect?
a. The discharge control valve is fitted in the delivery pipe.
b. The suction pipe is provided with a foot valve and a strainer.
c. The suction pipe has larger diameter as compared to the discharge pipe.
d. The discharge control valve is fitted in the suction pipe.
Q. A centrifugal pump should be so installed above the water level in the sump such that
a. The negative pressures are not allowed to develop in the impeller
b. The negative pressures do not reach as low a value as the vapour pressure
c. Its height is more than 10·28 m at ordinary temperature of liquid
d. None of the above.
Q. The specific speed of a pump is defined as the speed of unit of such a size that it
a. Produces unit power with unit head available
b. Delivers unit discharge at unit head
c. Requires unit power to develop unit head
d. Delivers unit discharge at unit power.
Q. Which of the following statements pertaining to a given centrifugal pump is correct?
a. Discharge varies as the square of speed
b. Power varies as the square of speed
c. Discharge varies directly as speed
d. Head varies inversely as spee
Q. The delivery valve, while starting centrifugal pump, is kept
a. Fully closed
b. Fully open
c. Half open
d. In any position.
Q. Which of the following is not a dimensionless parameter?
a. Friction factor
b. Specific speed
c. Thoma’s cavitation parameter
d. Pressure co-efficient.
Q. With reference to manometric head which of the following statements is correct?
a. It is the head developed by the pump.
b. It is the height to which water is lifted by the pump measured above the pump centreline.
c. it is the difference in elevation between the water surface in the high level reservoir and the water level in the sump.
d. It is the difference in the piezometric heads between the points on the delivery and suction pipes as close to the pump as possible.
Q. Higher specific speeds (160 to 500) of centrifugal pump indicate that the pump is of
a. Radial flow type
b. Axial flow type
c. Mixed flow type
d. Any of these types.
Q. Which of the following devices is used to store energy of liquid under pressure and make this energy available to hydraulic machines?
a. Hydraulic coupling
b. Hydraulic accumulator
c. Hydraulic ram
d. Hydraulic press.
Q. .... is a device which is employed for transmission of power from one shaft to another through a liquid medium.
a. Hydraulic intensifier
b. Hydraulic torque converter
c. Hydraulic coupling
d. Hydraulic press
Q. Which of the following devices is used for transmitting increased or decreased torque from one shaft toanother?
a. Hydraulic ram
b. Hydraulic coupling
c. Hydraulic intensifier
d. Hydraulic torque converter
Q. ..... is a device with which small quantities of water can be pumped to higher levels from the available large quantity of water of low head.
a. Hydraulic accumulator
b. Hydraulic intensifier
c. Hydraulic ram
d. Air lift pump.
Q. The function of which of the following hydraulic devices is analogous to that of the flywheel of a reciprocating engine and an electric storage battery?
a. Hydraulic ram
b. Hydraulic accumulator
c. Hydraulic intensifier
d. Hydraulic coupling.
Q. Which of the following statements with regard to the purposes served by hydraulic units is incorrect?
a. Hydraulic torque converter is used for transmitting increased or decreased torque to the driven shaft.
b. Hydraulic ram is a pump that is used to lift small quantities of water to greater heights from large quantity of water available at small heights.
c. Hydraulic intensifier stores the energy of fluid in the form of pressure energy and is used for lifting heavy weights.
d. Hydraulic accumulator stores the energy of a fluid in the form of pressure energy; that helps to reduce
Q. The working of which of the following hydraulic units is based on Pascal’s law?
a. Air lift pump
b. Jet pump
c. Hydraulic coupling
d. Hydraulic press.