Question 21 : The line of action of the buoyant force passes through the centre of gravity of the
1. volume of fluid vertically above the body.
2. horizontal projection of the body.
3. submerged body.
4. displaced volume of the fluid.
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Question 22 : Two dimensional stream function
1. relates velocity and pressure.
2. none of these.
3. is constant along an equipotential surface.
4. is constant along a stream line.
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Question 23 : The ratio of average fluid velocity to the maximum velocity in case of laminar flow of a Newtonion fluid in a circular pipe is
1. 2
2. 0.66
3. 1
4. 0.5
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Question 24 : Draining of shallow pits or sump is done by a sump pump, which is a __________ pump.
1. single stage vertical
2. centrifugal
3. plunger
4. diffuser
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Question 25 : A hydraulic ram acts as a/an __________ pump.
1. reciprocating
2. centrifugal
3. impulse
4. parallel cylinder
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Question 26 : What causes cavitation in centrifugal pump ?
1. High suction pressure
2. Low barometric pressure
3. Low suction pressure
4. High suction velocity
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Question 27 : The resistance wire used in a hot wire anemometer for conducting electrical current is made of
1. chromium
2. tungsten
3. copper
4. aluminium
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Question 28 : Shear stress in a fluid flowing in a round pipe
1. varies parabolically across the cross-section.
2. remains constant over the cross-section.
3. is zero at the wall and increases linearly to the centre.
4. is zero at the centre and varies linearly with the radius.
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Question 29 : For a particle settling in water at its terminal settling velocity, which of the following is true ?
1. Buoyancy = weight + drag
2. Drag = buoyancy + weight
3. Drag = weight
4. Weight = buoyancy + drag
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Question 30 : 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. 34
2. 40
3. 8
4. 37
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