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Mechanical Engineering Objective Questions { Hydraulic Machines }



85. Which place in hydraulic turbine is most susceptible for cavitation
A. Inlet of draft tube
B. Blade inlet
C. Guide blade
D. Penstock
Discussion
86. The suction lift of low-speed reciprocating pumps
A. Remains fairly constant upto water temperature of 40°C and thereafter decreases slowly first and then rapidly
B. Decreases linearly with increase in temperature of water to be pumped
C. Increases linearly with increase in temperature of water to be pumped
D. Has no correlation with water temperature
Discussion
87. It is possible to pump water available at around 100°C under atmosphere conditions using centrifugal pump placed near the tank
A. No
B. Yes
C. Yes, only if pump is properly selected
D. Yes, only if material of pump is selected properly
Discussion
88. The ratio of submergence to lift in air lift pump with increase of lift
A. Increases
B. Decreases
C. Remains same
D. Unpredictable
Discussion
89. The reaction type hydraulic turbines usually have their shafts arranged
A. Vertically
B. Horizontally
C. Inclined
D. May be either vertical or horizontal depending upon capacity
Discussion
90. Specific speed for axial flow turbines varies from
A. 0 to 4.5
B. 10 to 100
C. 80 to 200
D. 250 to 350
Discussion
91. Specific speed of hydraulic turbine is dependent upon
A. Speed, power developed and flow
B. Speed, power developed and effective head
C. Speed, head and flow
D. Speed, mean diameter and head
Discussion

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