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Mechanical Engineering Objective Questions { Hydraulic Machines }



106. For flood control and irrigation applications, the pump generally used is
A.Centrifugal type
B.Reciprocating type
C.Axial flow type
D.Screw type

107. For small discharge and high heads which pump is preferred
A.Centrifugal type
B.Reciprocating type
C.Axial flow type
D.Radial flow type

108. Higher specific speed (161 to 500) of centrifugal pump indicates, that pump is
A.Radial type
B.Mixed flow type
C.Axial flow
D.Any one of the above

109. Cavitation in hydraulic turbine results in
A.Noise and vibration
B.Reduction of discharge
C.Drop in output and efficiency
D.Rough surfaces

110. The cavitation in reaction type hydraulic turbines is avoided by
A.Using highly polished blade
B.Running turbine at designed speed
C.Installing the turbine below the tail race level
D.All of the above

111. Runaway speed of a hydraulic turbine corresponds to the condition of
A.Runner revolving freely without load and with the gates wide open
B.Critical speed
C.Breakage of runner
D.Speed obtained when load is suddenly disconnected

112. The runaway speed of the Francis turbine depending on the specific speed, varies from
A.100-200%
B.170-195%
C.200-245%
D.400-500%

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