Mechanical Engineering - Hydraulic Machines

Exercise :: Hydraulic Machines - Section 1

6. 

Discharge of a centrifugal pump is

A. directly proportional to diameter of its impeller
B. inversely proportional to diameter of its impeller
C. directly proportional to (diameter)2 of its impeller
D. inversely proportional to (diameter)2 of its impeller

Answer: Option D

Explanation:

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7. 

A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit power of the wheel is

A. 0.25 kW
B. 0.75 kW
C. 1.75 kW
D. 3.75 kW

Answer: Option C

Explanation:

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8. 

The static head of a centrifugal pump is equal to the __________ of suction head and delivery head.

A. product
B. difference
C. sum

Answer: Option C

Explanation:

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9. 

The ratio of actual work available at the turbine to the energy imparted to the wheel is known as __________ efficiency.

A. hydraulic
B. mechanical
C. overall

Answer: Option B

Explanation:

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10. 

Geometric similarity is said to exist between the model and the prototype, if both of them

A. have identical velocities
B. are equal in size and shape
C. are identical in shape, but differ only in size
D. have identical forces

Answer: Option C

Explanation:

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