Hydraulic Machines MCQs

Question 1

Reaction turbines are used for

Accepted Answer

Low head and high discharge

Answer

Low head

Answer

High head and low discharge

Answer

High head and high discharge

Question 2

The discharge through a reaction turbine with increase in unit speed

Accepted Answer

Decreases

Answer

Increases

Answer

Remains unaffected

Answer

First increases and then decreases

Question 3

Which place in hydraulic turbine is most susceptible for cavitation

Accepted Answer

Inlet of draft tube

Answer

Blade inlet

Answer

Guide blade

Answer

Penstock

Question 4

The suction lift of low-speed reciprocating pumps

Accepted Answer

Remains fairly constant upto water temperature of 40°C and thereafter decreases slowly first and then rapidly

Answer

Decreases linearly with increase in temperature of water to be pumped

Answer

Increases linearly with increase in temperature of water to be pumped

Answer

Has no correlation with water temperature

Question 5

It is possible to pump water available at around 100°C under atmosphere conditions using centrifugal pump placed near the tank

Accepted Answer

No

Answer

Yes

Answer

Yes, only if pump is properly selected

Answer

Yes, only if material of pump is selected properly

Question 6

The ratio of submergence to lift in air lift pump with increase of lift

Accepted Answer

Decreases

Answer

Increases

Answer

Remains same

Answer

Unpredictable

Question 7

The reaction type hydraulic turbines usually have their shafts arranged

Accepted Answer

Vertically

Answer

Horizontally

Answer

Inclined

Answer

May be either vertical or horizontal depending upon capacity

Question 8

Specific speed for axial flow turbines varies from

Accepted Answer

80 to 200

Answer

0 to 4.5

Answer

10 to 100

Answer

250 to 350

Question 9

Specific speed of hydraulic turbine is dependent upon

Accepted Answer

Speed, power developed and effective head

Answer

Speed, power developed and flow

Answer

Speed, head and flow

Answer

Speed, mean diameter and head