Question 51 : Drag force acting on a body does not depend upon the
1. density of the fluid.
2. density of the body.
3. velocity of the body.
4. projected area of the body.
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Question 52 : Acceleration head in a reciprocating pump
1. increases the work done during delivery stroke.
2. decreases the work done during suction stroke.
3. increases the work done during suction stroke.
4. does not change the work requirement of the pump.
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Question 53 : The temperature in isentropic flow
1. cannot drop and then increase again downstream.
2. depends on Mach number only.
3. none of these.
4. does not depend on Mach number.
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Question 54 : Fluid flow at increasing rate through a diverging pipe is an example of __________ flow.
1. steady uniform
2. non-steady uniform
3. steady non-uniform
4. non-steady non-uniform
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Question 55 : The ratio of inertial forces to elastic forces is called the __________ number.
1. Reynolds
2. Weber
3. Euler
4. Mach
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Question 56 : Mass velocity is independent of temperature & pressure, when the flow is
1. unsteady and the cross-section is changed.
2. steady through changing cross-section.
3. unsteady through unchanged cross-section.
4. steady and the cross-section is unchanged.
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Question 57 : In case of a centrifugal pump, the ratio of total delivered pressure to pressure developed with the impeller is called the __________ efficiency.
1. manometric
2. volumetric
3. overall
4. mechanical
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Question 58 : Very small pressure difference (< 5 mm water coloumn) can be most conveniently measured by a/an __________ manometer.
1. U-tube water.
2. inclined tube mercury.
3. inclined tube water.
4. U-tube mercury.
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Question 59 : If more than two branches of pipes are to be connected at the same point, then use a/an
1. elbow
2. none of these.
3. union
4. tee
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Question 60 : A differential pressure cell is used for
1. measuring the difference of the impact & the static pressure.
2. remote recording of pressure difference.
3. measuring small pressure difference in liquids.
4. measuring small pressure difference in gases.
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