Fluid Mechanics

121.Cd is always _________ Cc

1. Greater than
2. Less than
3. Equal to
4. Either more or less than

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122.Centre of pressure in an immersed body is _________ the centre of gravity.

1. Above
2. Below
3. At
4. Either above or below; depends on the liquid density

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123.Centre of pressure of a plane surface of arbitrary shape immersed vertically in a static mass of fluid

1. Lies above the centroid of the plane surface
2. Is independent of the specific weight of the fluid
3. Is different for different fluids
4. Is at the centroid of the plane surface

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124.Centrifugal compressors compared to reciprocating compressors

1. Require less space
2. Have quieter operation
3. Have lower operating costs
4. All (A), (B) and (C)

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125.Centrifugal pump can't be used to pump

1. Molten sodium (used as a coolant in Fast Breeder Reactor)
2. Moderately viscous vegetable oil used in soap industry
3. Thick molten soap at 80°C
4. None of the above

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126.Centrifugal pump is normally classified on the basis of the

1. rpm
2. Type of casing
3. Impeller blade angle
4. Number of blades in impeller

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127.Centrifugal pumps as compared to reciprocating pumps

1. Run at a lower speed for the same discharge
2. Do not need priming
3. Deliver fluid with pulsating/fluctuating discharge
4. Can be run with discharge line valve closed for a short interval

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128.Check in a centrifugal pump is

1. Provided in the discharge line
2. Generally a globe valve
3. Provided to prevent liquid from backing up through the pump when the pump is turned off or accidently stops running
4. All (A), (B) and (C)

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129.Check valve is used for _________ flow.

1. Very precise control of
2. Unidirectional
3. Multidirectional
4. None of these

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130.Check valve provided in the discharge line of a centrifugal pump serves the purpose of controlling the

1. Back flow of fluid in the event of stoppage of pump
2. Discharge pressure
3. Flow of liquid during operation of the pump
4. All (A), (B) and (C)

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