Hydraulic and Fluid Mechanics

101. At the center line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be

1. Minimum
2. Maximum
3. Zero
4. Could be any value

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102. Barometer is used to measure

1. Pressure in pipes, channels etc.
2. Atmospheric pressure
3. Very low pressure
4. Difference of pressure between two points

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103. Bernoulli equation deals with the law of conservation of

1. Mass
2. Momentum
3. Energy
4. Work

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104. Bernoulli's equation is applied to

1. Venturimeter
2. Orifice meter
3. Pitot tube
4. All of these

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105. Bulk modulus of a fluid _

1. Remain same
2. Decreases
3. Increases
4. None of these

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106. Bulk modulus of a fluid is the ratio of

1. Shear stress to shear strain
2. Increase in volume to the viscosity of fluid
3. Increase in pressure to the volumetric strain
4. Critical velocity to the viscosity of fluid

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107. Buoyant force is

1. he resultant force acting on a floating body
2. he resultant force on a body due to the fluid surrounding it
3. qual to the volume of liquid displaced
4. he force necessary to maintain equilibrium of a submerged body

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108. Capillary action is due to the

1. Surface tension
2. Cohesion of the liquid
3. Adhesion of the liquid molecules and the molecules on the surface of a solid
4. All of the above

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109. Cavitation is caused by

1. High velocity
2. High pressure
3. Weak material
4. Low pressure

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110. Cavitation will begin when

1. The pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid
2. Pressure becomes more than critical pressure
3. Flow is increased
4. Pressure is increased

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