Fluid Mechanics and Fluid Machines

1.

What is a syphon?

A long bend pipe used to carry water from a reservoir at a higher level to another reservoir at a lower level when two reservoirs are separated by a hill A long bend pipe used to carry water from a reservoir at a lower level to another reservoir at a higher level with some work input when two reservoirs are separated by a hill A long bend pipe used to carry water from one reservoir to another reservoir when two reservoirs are at same elevation Unpredictable

2.

What is the formula for determining the size of equivalent pipe for two pipes of lengths L1, L2 and diameters d1, d2 respectively?

Where,
L = L1 + L2

(L / d) = (L1 / d1) + (L2 / d2)

(L / d2 ) = (L1 / d12) + (L2 / d22)

(L / d3) = (L1 / d13 ) + (L2 / d23)

(L / d5) = (L1 / d15 ) + (L2 / d25)

3.

What is the effect of change in Reynold's number on friction factor in turbulent flow?

As the Reynold's number increases the friction factor increases in turbulent flow As the Reynold's number increases the friction factor decreases in turbulent flow change in Reynold's number does not affect the friction factor in turbulent flow unpredictable

4.

The friction factor in fluid flowing through pipe depends upon

Reynold's number relative roughness of pipe surface both a. and b. none of the above

5.

What is temporal mean velocity?

The average of velocities at a point over a certain period of time The average of velocities of a single particle over different locations in a fluid flow None of the above

6.

Friction factor for laminar flow is given by

(Re /64) (64 / Re) (Re / 16) (16 / Re)

7.

Magnitude of eddy viscosity for laminar flow is

less than zero zero greater than zero unpredictable

8.

The cylindrical portion of short length, which connects converging and diverging section of venturimeter, is called as

diffuser connector throat manometer tube

9.

Venturimeter consists of short converging conical tube which has a total inclination angle of

11 ± 1o

21 ± 1o

30 ± 1o

60 ± 1o

10.

Which of the following devices does not use Bernoulli's equation as its working principle?

Venturimeter Orifice-meter Pitot tube None of the above

Fluid Mechanics and Fluid Machines

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Fluid Mechanics and Fluid Machines

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