Hydraulic and Fluid Mechanics

111. Center of buoyancy is the

1. Centroid of the displaced volume of fluid
2. Center of pressure of displaced volume
3. Does not exist
4. None of the above

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112. Center of pressure compared to e.g. is

1. Above it
2. Below it
3. At same point
4. Above or below depending on area of body

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113. Center of pressure on an inclined plane is

1. At the Centroid
2. Above the Centroid
3. Below the Centroid
4. At metacentre

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114. Choose the correct relationship

1. Specific gravity = gravity × density
2. Dynamic viscosity = kinematic viscosity × density
3. Gravity = specific gravity × density
4. Kinematic viscosity = dynamic viscosity × density

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115. Choose the wrong statement

1. Viscosity of a fluid is that property which determines the amount of its resistance to a shearing force
2. Viscosity is due primarily to interaction between fluid molecules
3. Viscosity of liquids decreases with increase in temperature
4. Viscosity of liquids is appreciably affected by change in pressure

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116. Choose the wrong statement. Alcohol is used in manometer, because

1. Its vapour pressure is low
2. It provides suitable meniscus for the inclined tube
3. Its density is less
4. It provides longer length for a given pressure difference

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117. Coefficient of contraction is the ratio of

1. Actual velocity of jet at vena contracta to the theoretical velocity
2. Loss of head in the orifice to the head of water available at the exit of the orifice
3. Loss of head in the orifice to the head of water available at the exit of the orifice
4. Area of jet at vena-contracta to the area of orifice

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118. Coefficient of discharge Cd is equal to (where Cc = Coefficient of contraction, Cv = Coefficient of velocity, and Cr = Coefficient of resistance)

1. C_c × C_v
2. C_c × C_r
3. C_v × C_r
4. C_c/C_r

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119. Coefficient of resistance is the ratio of

1. Actual velocity of jet at vena-contracta to the theoretical velocity
2. Area of jet at vena-contracta to the area of orifice
3. Loss of head in the orifice to the head of water available at the exit of the orifice
4. Actual discharge through an orifice to the theoretical discharge

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120. Coefficient of velocity is defined as the ratio of

1. Actual velocity of jet at vena-contracta to the theoretical velocity
2. Area of jet at vena-contracta to the area of orifice
3. Loss of head in the orifice to the head of water available at the exit of the orifice
4. Actual discharge through an orifice to the theoretical discharge

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