Fluid Mechanics

331.Mach number is the ratio of the speed of the

1. Fluid to that of the light
2. Light to that of the fluid
3. Fluid to that of the sound
4. Sound to that of the fluid

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332.Maintenance cost of a _________ pump for a particular duty is the least.

1. Centrifugal
2. Reciprocating
3. Volute
4. Gear

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333.Major loss in sudden contraction in pipe flow is due to

1. Boundary friction
2. Flow contraction
3. Expansion of flow after sudden contraction
4. None of these

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334.Manometers measure the _________ pressure.

1. Vacuum as well as the atmospheric
2. Difference in
3. Absolute
4. Gage

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335.Mass velocity in case of steady flow and through a constant cross-section conduit is independent of the

1. Temperature
2. Pressure
3. Both (A) & (B)
4. Neither (A) nor (B)

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336.Mass velocity is independent of temperature & pressure, when the flow is

1. Unsteady through unchanged cross-section
2. Steady through changing cross-section
3. Steady and the cross-section is unchanged
4. Unsteady and the cross-section is changed

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337.Maximum theoretical suction lift for water at 15°C by a centrifugal pump is 34 ft. The same for water at 90°C will be _________ ft.

1. 40
2. 34
3. 8
4. 37

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338.Medium viscosity lubricating oil can be most ideally pumped by a _________ pump.

1. Vane
2. Piston
3. Centrifugal
4. Plunger

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339.Mercury is an ideal barometric fluid mainly due to its

1. High density
2. Low compressibility
3. Low capillary action
4. Very low vapor pressure

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340.Minimum fluidisation velocity for a specific system depends upon the

1. Particle size
2. Fluid viscosity
3. Density of both the particle & the fluid
4. All (A), (B) and (C)

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