Top 1000+ Solved Fluid Mechanics (FM) MCQ Questions Answer
Q. Which among the following is not a type of compounding?
a. Pressure
b. Temperature
c. Pressure velocity
d. Velocity
Q. Newtons second law describes the transfer of energy through impulse turbines.
a. True
b. False
c. none
d. none
Q. Inner radial flow extracts energy from
a. Turbine blades
b. Moving fluid
c. Pressure change
d. Temperature increase
Q. Reaction turbines develop torque by reacting to the gas or fluids pressure or mass.
a. True
b. False
c. none
d. none
Q. What is the water flow direction in the runner in a Francis turbine?
a. Axial and then tangential
b. Tangential and then axial
c. Radial and then axial
d. Axial and then radial
Q. Which of the following is true in case of flow of water before it enters the runner of a Francis Turbine?
a. Available head is entirely converted to velocity head
b. Available head is entire converted to pressure head
c. Available head is neither converted to pressure head nor velocity head
d. Available head is partly converted to pressure head and partly to velocity head
Q. Why does the cross sectional area of the Spiral casing gradually decrease along the circumference of the Francis turbine from the entrance to the tip?
a. To ensure constant velocity of water during runner entry
b. To prevent loss of efficiency of the turbine due to impulsive forces caused by extra area
c. To prevent leakage from the turbine
d. To reduce material costs in order to make the turbine more economical
Q. Which of the following profiles are used for guide vanes to ensure smooth flow without separation?
a. Rectangular
b. Bent Rectangular
c. Elliptical
d. Aerofoil
Q. In which of the following type of runners the velocity of whirl at inlet is greater than the blade velocity?
a. Such a case is practically impossible
b. Slow Runner
c. Medium Runner
d. Fast Runner
Q. In the figure shown below,which of the following angles replace the question mark?
a. Guide vane angle at inlet
b. Blade angle at inlet
c. Vane angle at inlet
d. Blade angle at outlet
Q. In the figure shown below, which of the following type of runners has the bladecurvature as shown in the above figure (The arrow denotes direction of blade motion)?
a. Information insufficient to determine
b. Slow Runner
c. Medium Runner
d. Fast Runner
Q. Francis turbine is typically used for which of the following values of available heads?
a. 300 m
b. 100 m
c. 30 m
d. 5 m
Q. Power developed by Francis turbine are calculated for a certain set of conditions. Now, the inlet whirl velocity is doubled, the blade velocity at inlet is doubled and the flow velocity is quartered. The power developed:
a. Is 4 times the original value
b. Is 2 times the original value
c. Is ½ times the original value
d. Is same as the original value