Top 50+ Solved Impact of Jet and Hydraulic Turbines MCQ Questions Answer
Q. In an outward radial flow turbine energy conversion process is
a. Purely by reaction only
b. Purely by impulse only
c. Partly by impulse and partly by reaction
d. None of the above.
Q. Which of the following turbines is least efficient under part load conditions:
a. Propeller
b. Kaplan
c. Francis
d. Pelton.
Q. A surge tank is used to
a. Prevent occurrence of hydraulic jump
b. Smoothen the flow
c. Relieve the pipeline of excessive pressure transients
d. Avoid reversal of flow.
Q. Which of the following turbines is most efficient at partload operation?
a. Kaplan
b. Propeller
c. Francis
d. Pelton wheel.
Q. With respect to a Kaplan turbine which of the following statements is incorrect?
a. It employs large guide vane angles than is the case for a Francis turbine.
b. It is designed for flow velocity of mixed flow type.
c. It has blades of small camber to prevent separation.
d. It can adjust both guide vane and blade angles according to rate of discharge.
Q. Specific speed of an impulse turbine (Pelton wheel) ranges from
a. 12 to 70
b. 80 to 400
c. 300 to 1000
d. 1000 to 1200.
Q. Cavitation damage in turbine runner occurs near the
a. Inlet on the convex side of blades
b. Outlet on the convex side of blades
c. Inlet on the concave side of blades
d. Outlet on the concave side of blades.
Q. Which of the following serious problems arise from cavitation?
a. Noise and vibration.
b. Damage to blade surface.
c. Fall in efficiency.
d. All of the above.
Q. A Kaplan turbine is
a. An inward flow impulse turbine
b. Low head axial flow turbine
c. High head axial flow turbine
d. High head mixed flow turbine.
Q. An impulse turbine requires
a. High head and small quantity of flow
b. Low head and small quantity of flow
c. Low head and high rate of flow
d. None of the above
Q. ......of a turbine is defined as the ratio of power available at the turbine shaft to the power supplied by the water jet.
a. Mechanical efficiency
b. Hydraulic efficiency
c. Overall efficiency
d. Volumetric efficiency.
Q. The ratio of power developed by the runner to the power supplied by the jet at entrance to the turbine isknown as
a. Hydraulic efficiency
b. Mechanical efficiency
c. Volumetric efficiency
d. Overall efficiency.
Q. The water which acts on the runner blades of a reaction turbine is under a pressure
a. Equal to atmospheric
b. Below atmospheric
c. Above atmospheric
d. None of the above.
Q. The runner passages of a reaction turbine are
a. Partially filled with water
b. Always completely filled with water
c. Never filled with water
d. None of the above.
Q. The value of speed ratio (Ku) in case of a Francis turbine ranges from
a. 0.2 to 0.3
b. 0.4 to 0.5
c. 0.6 to 0.9
d. None of the above.