Related Questions

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%
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
Venturimeters, orificemeters and nozzles are used to measure the fluid discharge from a pipeline. The average fluid velocity in a pipeline can be measured by a/an
A Weir
B Hot wire anemometer
C Cup and vane aneometer
D None of these
Water hammer in pipelines results, when the flowing fluid
A Has very high velocity
B Has very high pressure
C Is brought to rest by gradually closing a valve
D Is suddenly brought to rest by closing a valve
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
Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is
A Neutralised by alkali treatment
B Left as such without any treatment
C Diluted with fresh water to reduce its acidity
D None of these
The magnitude of water hammer depends upon the
A Elastic properties of the pipe material
B Elastic properties of the liquid flowing through the pipe
C Speed at which the valve is closed
D All of the above
In pressure supply mains, water hammer pressure is reduced by providing
A Sluice valves
B Air valves
C Pressure relief valves
D None of these
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
The magnitude of water hammer caused in pipe flow is independent of the
A Pipe length
B Fluid flow stoppage rate
C Fluid temperature
D Time of valve closure

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