Fluid Mechanics

101.Boiler feed water pump is usually a _________ pump.

1. Reciprocating
2. Gear
3. Multistage centrifugal
4. Diaphragm

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102.Boundary layer exists in flow

1. Of real fluids
2. Over flat surfaces only
3. In pipes only
4. Of ideal fluids only

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103.Boundary layer separation is caused by the

1. Reduction of pressure below vapour pressure
2. Reduction of pressure gradient to zero
3. Adverse pressure gradient
4. Reduction of boundary layer thickness to zero

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104.Boundary layer separation is characterised by one of the conditions given below, where 'Re' is the Reynolds number for the flow. Select the appropriate conditions.

1. Re << 1, accelerating flow
2. Re >> 1, accelerating flow
3. Re << 1, decelerating flow
4. Re >>1, decelerating flow

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105.Boundary layer separation occurs when the

1. Pressure reaches a minimum
2. Cross-section of the channel is reduced
3. Valve is closed in a pipeline
4. Velocity of sound is reached

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106.Boundary layer thickness in laminar flow over a flat plate increases as(where, d = distance from the leading edge.)

1. √d
2. d^1/3
3. d²
4. d^2/3

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107.Boundary layer thickness in turbulent flow over a flat plate increases as(where, d = distance from the leading edge.)

1. √d
2. d^2/3
3. d^4/5
4. d1/3

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108.Brownian movement is prominent in the particle size range of _________ microns in case of settling of a particle in a fluid.

1. 2 to 3
2. 0.01 to 0.10
3. 200 to 300
4. 100 to 1000

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109.Buckingham-π theorem states that in any physical problem including 'n' quantities having 'm' dimensions, the quantities can be arranged into _________ independent dimensionless parameters.

1. m
2. n
3. n-m
4. n/m

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110.Buoyant force

1. For non-symmetrical bodies is not vertical
2. Depends on the depth of the submergence of the floating body
3. Depends on the weight of the floating body
4. None of these

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