Question 71 : A pitched-blade turbine draws __________ a straight blade turbine.
1. more power than
2. less power than
3. data insufficient to predict
4. same power as
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Question 72 : Rotary vacuum pumps can reduce the absolute pressure to as low as __________ mm Hg.
1. 1
2. 0.1
3. 0.001
4. 0.01
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Question 73 : The ratio of wall drag to total drag in the Stoke's law range is
1. 1
2. 2/3
3. 1/3
4. 0.5
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Question 74 : A mercury (specific gravity = 16) manometer connected across an orificemeter fitted in a pipe shows a manometer reading of 2 cms. If the manometer liquid is changed to carbon tetrachloride (specific gravity = 6), then for the same flow rate of water the new manometer reading will be __________ cms.
1. 8
2. 84
3. 17
4. 42
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Question 75 : The variable required to be known in correlations used for estimating the horse power of a centrifugal gas compressor and hence its cost are P. Inlet pressure Q. Compressor rpm R. Delivery pressure S. Volumetric flow rate at inlet.
1. P and R
2. P, Q and R
3. P, Rand S
4. R and S
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Question 76 : Theoretical head developed by a centrifugal pump does not depend upon the __________ the impeller.
1. fluid velocity leaving
2. radius of
3. none of these
4. speed of
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Question 77 : With increase in temperature, the vapor pressure of liquids
1. increases
2. remains constant
3. increases linearly
4. decreases
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Question 78 : Boundary layer separation is caused by the
1. reduction of pressure to vapour pressure.
2. boundary layer thickness reducing to zero.
3. adverse pressure gradient.
4. reduction of pressure gradient to zero.
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Question 79 : Higher specific speed (200-500) of a centrifugal pump indicates that the pump is of __________ flow type.
1. axial
2. radial
3. mixed
4. none of these
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