Question 11 : Which of the following denotes the effect of compressibility in fluid flow ?
1. Mach number
2. Weber number
3. Euler number
4. Reynolds number
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Question 12 : Water hammer in a pipeline results from the
1. none of these.
2. rapid pressure change due to a rapid change in the rate of flow.
3. bursting of pipelines due to closure by a valve.
4. pressure increase due to closure of a valve resulting in decrease in rate of flow.
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Question 13 : The velocity profile for turbulent flow through a closed conduit is
1. hyperbolic
2. linear
3. parabolic
4. logarithmic
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Question 14 : The terminal velocity of a small sphere settling in a viscous fluid varies as the
1. square of the difference in specific weights of solid & fluid.
2. inverse of the fluid viscosity.
3. first power of its dimeter.
4. inverse square of the diameter.
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Question 15 : Most commonly used joint in the underground pipe lines is the
1. coupling
2. expansion joint
3. sleevejoint
4. flange
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Question 16 : With increasing flow rate, the hydraulic efficiency of a centrifugal pump
1. decreases and then increases.
2. increases and then decreases.
3. remains constant.
4. monotonically decreases.
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Question 17 : When the momentum of one fluid is used for moving another fluid, such a device is called a/an
1. jet pump
2. blower
3. none of these
4. acid egg
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Question 18 : The fluid property, due to which, mercury does not wet the glass is
1. cohesion
2. viscosity
3. surface tension
4. adhesion
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Question 19 : The net positive suction head (NPSH) of a centrifugal pump is defined as the sum of the velocity head and the pressure head at the
1. discharge minus vapor pressure of the liquid at the discharge temperature.
2. suction
3. discharge
4. suction minus vapor pressure of the liquid at suction temperature.
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Question 20 : Laminar flow of a Newtonion fluid ceases to exist, when the Reynolds number exceeds
1. 1500
2. 2100
3. 3000
4. 4000
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