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ESE ME 2018 Achiever Study Plan: Fluid Mechanics Quiz 3

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Question 1

Consider the following statements:
1) Wind velocity at about 20 m height above the ground is taken as the rated velocity for design of windmills.
2) The total power of a wind stream is directly proportional to the cube of average velocity.
3) Wind turbine operates with variable load over a narrow range between cut-in and cut-out velocities.
4) Vertical wind machine operates in all wind directions, but it needs yaw adjustment.
Which of the above statements are correct?

Question 2

Which one of the following conditions will linearize the Navier-Stokes equations to make it amenable for analytical solutions?

Question 3

While using boundary layer equations, Bernoulli's equation

Question 4

Manometer is a device used for measuring

Question 5

How are the velocity coefficient Cv, the discharge coefficient Cd and the contraction coefficient Cc of an orifice related?

Question 6

A venturimeter in oil (sp. gr. 0.8) pipe is connected to a differential manometer in which the gauge liquid is mercury (sp. gr. 13.6). For a flow rate of 0.16 m3/s, the manometer registers a gauge differential of 20 cm. The oil-mercury manometer being unavailable, an air-oil differential manometer is connected to the same venturimeter. Neglecting variation of discharge coefficient for the venturimeter, what is the new gauge differential for a flow rate of 0.08 m3/s ____________?

Question 7

In an open U-tube containing mercury, kerosene of specific gravity 0.8 is poured into one its limbs so that the length of column of kerosene is about 40 cm. The level of mercury column in that limb is lowered approximarely by how much ?

Question 8

The discharge, over a rectangular weir of width 100 m when the head of water over te weir is 1.5 m and the head due to velocity of approach is 0.02 m, is given by

Question 9

When can a piezometer be not used for pressure measured in pipes?

Question 10

Angle of diverging portion of the venturimeter is limited to 7 °, because
1) Flow decelerates in the diverging portion and pressure increases in the downstream direction. Hence, the fluid experience an adverse pressure gradient, if the divergence angle is large.
2) Flow separation takes place due to adverse pressure gradient when divergence angle is large.
3) If the divergence angle is large, a negative pressure is created at the throat which obstructs the flow of fluid.
Which of the above reasons are correct?
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Oct 30ESE & GATE ME