1. Choose the correct answer from the given alternatives.

An ideal fluid has viscosity of value

0.5 poise

1.0 poise

zero value

0.25 poise

Mass density of water in kg/m^3 is

680

900

998

1268

Dimensions of Surface Tension are

M^1 L^1

M^1 L^0

M^1 L^2

M^1 L^0

Slope of energy gradient line is given by



hf/L

S L/hf

hf/A

Physical quantities used in Fluid-mechanics are expressed in the following fundamental dimensions:

Length, Mass and Time

Force, Mass and Temperature

Mass, Time, Temperature and Force

Length, Mass, Time, Force and Temperature

In Coplanar Non-Concurrent Forces

All forces lie in one plane

All forces pass through a common point

All forces do not pass through a common point

and above

Practical fluids

are viscous

possess surface tension

are compressible

Possess all the above

Highest efficiency is obtained with the following channel section

Circular

Rectangular

Trapezoidal

Triangular

For pipes, turbulent flow occurs when Reynolds number is

Less than 2000

Less than 4000

More than 4000

Between 2000 and 4000

The discharge through a rectangular notch weir varies as









If pressure intensity is expressed with respect to complete vacuum, it is called as

Gauge pressure

Vacuum pressure

Absolute pressure

Atmospheric pressure

The velocity at which the flow changes from laminar to turbulent is called

Critical velocity

Lower critical velocity

Upper critical velocity

Mean critical velocity

The loss of head at bends is expressed as

HL= V^2/2g

HL kV^2/2g

HL gV^2/2k

HL 2gk/V^2

The coefficient of contraction of the convergent mouthpiece

increases as the angle of convergence(8) increases.

decreases as the angle of convergence increases.

decreases as the angle of convergence decreases.

never changes.

Write about orifice meter and venturimeter with their merits and demerits.

An orifice meter is fixed in a pipe of 25 cm diameter conveying oil of specific gravity 0·90. If the diameter of the orifice is 10 cm, calculate the discharge, when a mercury differential manometer shows a difference of 80 cm. (Take C =0.65)

Water flows through a 200 mm diameter pipe fitted with a 100 mm diameter horizontal orifice meter at the rate of 0·015 m^3/s. Determine the difference of pressure head between upstream and vena contracta. (Take C =0.61)

Derive an equation for the loss of head due to obstruction.

A box of rectangular base 3 m x 4 m contains gasoline (specific gravity upto a height of 5 m. Calculate the force on the base and on each of the vertical faces and locate their lines of action.

Explain about the types of flow with examples.

Explain about classification of forces.

For the distribution main of a town water supply, a 600 mm diameter pipe is required. As pipes of 600 mm diameter are not available, it is decided to lay two smaller pipes of equal diameter in parallel. Find the diameter of these pipes.

A reservoir having a surface area of 800 m^2 is emptied by a 0·5 m wide rectangular weir. How long should it take to empty the reservoir from a height 0·3 m to 0·2 m above the sill (Take Cd =0·65).

5. Answer any two of the following questions:

Write short notes on any two of the following:

Hydraulic Mean Depth

Energy Gradient Line

Hydraulic Gradient Line

Explain about Reynolds experiment on flow through pipes.

Two reservoirs are connected by 2 pipes of the same length laid in parallel. The diameters of the pipes are 10 cm and 30 cm respectively. If the discharge through 10 em dia pipe is 0·01 cumecs, what will be the discharge through 30 cm dia pipe Assume that f is same for both pipes.