Water hammer in pipelines results, when the flowing fluid

Water hammer is caused, when water flowing in a pipe is suddenly brought to rest by closing the valve. The extent of pressure thus produced due to water hammer depends on the

A

Pipe length

B

Fluid velocity in the pipe

C

Time taken to close the valve

D

All of the above

A hammer and a screwdriver currently have the same price. If the price of a hammer rises by 6% and the price of a screwdriver goes up by 4%, how much more will it cost to buy 1 hammer and 1 screwdriver?

A

5%

B

10%

C

24%

D

40%

Pressure difference between two points in vessels, pipelines or in two different pipelines can be measured by a differential manometer. The pressure difference measured as the mm of water coloumn in case of mercury-water, differential manometer is equal to (where, H = difference in height of mercury column in mm).

A

H

B

12.6 H

C

13.6 H

D

14.6 H

Water hammer is caused in steam carrying pipelines, because of

A

Partial condensation of steam

B

Vibration of the pipeline

C

High degree of superheat of steam

D

Its exposure to torrential rain

Water hammer in a pipeline results from the

A

Bursting of pipelines due to closure by a valve

B

Rapid pressure change due to a rapid change in the rate of flow

C

Pressure increase due to closure of a valve resulting in decrease in rate of flow

D

None of these

Two fluids are flowing through two similar pipes of the same diameter. The Reynold's number is same. For the same flow rate if the viscosity of a fluid is reduced to half the value of the first fluid, the pressure drop will

A

Increase

B

Decrease

C

Remain unchanged

D

Data insufficient to predict relative pressure drop

The pressure of fluid due to hammer blow is

A

Directly proportional to density of fluid

B

Inversely proportional to density of fluid

C

Directly proportional to $${\left( {{\text{density}}} \right)^{\frac{1}{2}}}$$ of fluid

D

Inversely proportional to $${\left( {{\text{density}}} \right)^{\frac{1}{2}}}$$ of fluid

The average of 17 results is 60. If the average of first 9 results is 57 and that of the last 9 results is 65, then what will be the value of 9th result?

A

39

B

78

C

117

D

156

Surge tanks are provided in high pressure water pipelines to

A

Store a definte quantity ofwater all the time

B

Reduce the water hammer

C

Facilitate easy dismantling of pipeline for cleaning and maintenance

D

None of these

Fresh water carrying pipelines in chemical industries are coloured with __________ color.

A

Sea green

B

Brown

C

Yellow

D

Red

Water hammer in pipelines results, when the flowing fluid

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