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Mechanical Engineering Objective Questions { Hydraulic Machines }

78. The flow rate in gear pump
A.Increases with increase in pressure
B.Decreases with increase in pressure
C.More or less remains constant with increase in pressure

79. Francis, Kaplan and propeller turbines fall under the category of
A.Impulse turbines
B.Reaction turbines
C.Axial flow turbines
D.Mixed flow turbines

80. Reaction turbines are used for
A.Low head
B.Low head and high discharge
C.High head and low discharge
D.High head and high discharge

81. The discharge through a reaction turbine with increase in unit speed
C.Remains unaffected
D.First increases and then decreases

82. The angle of taper on draft tube is
A.Greater than 15
B.Greater than 8
C.Greater than 5
D.Less than 8

83. Specific speed for reaction turbines ranges from
A.0 to 4.5
B.10 to 100
C.80 to 200
D.250 to 300

84. In axial flow fans and turbines, fluid enters and leaves as follows
A.Radially, axially
B.Axially, radially
C.Axially, axially
D.Radially, radially

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