Cavitation is caused by

Probability of cavitation occuring becomes very high, when the local __________ resulting in water bubbles formation, which on rupture cause cavitation

A

Pressure falls below the vapour pressure

B

Pressure becomes very high

C

Temperature becomes low

D

All of the above

Cavitation in a pump creates so many undesirable effects. Out of the following, which is not an undesirable effect created by cavitation?

A

Decrease in effect

B

Increase in thrust

C

Develops noise

D

Develops high pressure

In fluid flow, cavitation is caused, if the

A

Fluid velocity decreases to zero

B

Total energy decreases

C

Both A and B

D

Flow pressure approaches its vapor pressure at the prevailing temperature

The cavitation in a hydraulic machine is mainly due to

A

low pressure

B

high velocity

C

high pressure

D

low velocity

Causes of cavitation on chest x-ray are

A

Granulomatosis with polyangitis

B

Pulmonary infarction

C

Pulmonary tuberculosis

D

Fibrosingalveolitis

E

Asbestosis

Cavitation in a centrifugal pump can be avoided by keeping the

A

Inlet pressure high

B

Outlet pressure low

C

Inlet pressure low

D

Outlet pressure high

Cavitation in a centrifugal pump results from

A

High discharge pressure

B

Low barometric pressure

C

High discharge velocity

D

High discharge rate

The cavitation in reaction turbines is avoided, to a great extent by

A

Installing the turbine below the tail race level

B

Using stainless steel runner of the turbine

C

Providing highly polished blades to the runner

D

All of the above

In order to avoid cavitation in centrifugal pumps

A

The suction pressure should be high

B

The delivery pressure should be high

C

The suction pressure should be low

D

The delivery pressure should be low

The cavitation in a hydraulic machine

A

Causes noise and vibration of various parts

B

Reduces the discharge of a turbine

C

Causes sudden drop in power output and efficiency

D

All of the above

Cavitation is caused by

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