Question 41 : For ideally incompressible fluid, the Mach number will be
1. 5
2. 2
3. 1
4. 5
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Question 42 : A mono pump is a __________ pump.
1. centrifugal
2. piston
3. a group of vacuum
4. positive acting rotary
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Question 43 : Priming is needed in a __________ pump.
1. centrifugal
2. diaphragm
3. gear
4. reciprocating
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Question 44 : Which of the fluid forces are not considered in the Reynold's equation of flow ?
1. Pressure forces
2. Turbulent forces
3. Compressibility forces
4. Viscous forces
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Question 45 : In an incompressible fluid, the density is
1. greatly affected by moderate changes in pressure.
2. sensible to changes in both temperature & pressure.
3. not affected with moderate change in temperature & pressure.
4. greatly affected only by moderate changes in temperature
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Question 46 : Velocity distribution for flow between two fixed parallel plates
1. varies parabolically across the section.
2. is constant over the entire cross-section.
3. none of these.
4. is zero at the plates and increases linearly to the midplane.
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Question 47 : Where does the maximum stress occur in case of laminar flow of incompressible fluid in a closed conduit of diameter 'd'?
1. At d/4 from the wall
2. At the centre
3. At d/8 from the wall
4. At the wall
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Question 48 : Check valves are used
1. at high pressure.
2. in bends.
3. for controlling water flow.
4. for unidirectional flow.
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Question 49 : Applying a pressure drop across a capillary results in a volumetric flow rate 'Q' under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is
1. Q/2
2. Q/8
3. Q/16
4. Q/4
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Question 50 : Centrifugal pump is normally classified on the basis of the
1. number of blades in impeller.
2. type of casing.
3. rpm
4. impeller blade angle.
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