# Engineering/Civil Engineering -MCQS-Hydraulics Section 2 Sample Test,Sample questions

## Question: ``` From a nozzle exposed to atmosphere, the liquid jet traverses```

1.a straight line

2. a circular path

3.an elliptical path

4.a parabolic path.

1.0.25 s

2. 0.50 s

3.1.0 s

4.1.5 s.

## Question: ``` In flow, the liquid particles may possess```

1.potential energy

2.kinetic energy

3. pressure energy

4.all the above.

## Question: ``` Flow in pipes is laminar if Reynold number is```

1.less than 2100

2.more than 3000

3.between 2100 and 3000

4.none of these.

## Question: ``` For critical depth of flow of water in open channels, fc the specific energy must be :```

1.minimum

2.maximum

3.average of maximum and minimum

4.None of these.

## Question: ``` In fluids, steady flow occurs when```

1.conditions of flow change steadily with time

2.conditions of flow do not change with time at a point

3.conditions of flow remain the same at adjacent point

4.velocity vector remains constant at a point.

## Question: ``` In pipe lines, a surge tank is provided```

1.to relieve the pressure due to water hammer

3. to overflow the pipe line when suddenly closed

4.to remove the frictional loss in pipe.

## Question: `A steady uniform flow is through`

1.a long pipe at decreasing rate

2.a long pipe at constant rate

3. an expanding tube at constant rate

4.an expanding tube at increasing rate

## Question: `Barometres are used to measure`

1.pressure in water channels, pipes etc.

2.difference in pressure at two points

3.atmospheric pressure

4. very low pressure

1.Low pressure

2.High pressure

3.Low velocity

4.High velocity

## Question: `Due to decrease of diameter of the droplet, inside pressure intensity`

1.increases

2.decreases

3.remains unaffected

4.None of these.

## Question: `Euler's equation for the motion of liquids assumes that`

1.fluid is viscous

2.fluid is homogeneous and incompressible

3.velocity of flow is non-uniform over the section

4.flow is unsteady along the stream line.

## Question: `For most economical rectangular section of a channel, the depth is kept`

1.one-fourth of the width

2. three times the hydraulic radius

3. half the width

4.hydraulic mean depth

## Question: `For the most economical trapezoidal open channel,`

1.half of the top width must be equal to one of the sloping sides

2.the hydraulic mean depth must be equal to half the depth of flow

3.the semicircle drawn with top width as diameter must touch the three sides of the channel

4.All of these.

## Question: `Gauge pressure is`

1.absolute pressure - atmospheric pressure

2.absolute pressure + atmospheric pressure

3.atmospheric pressure - absolute pressure

4.none of these.

## Question: `Hydraulic ram is a device`

1. for lifting water without an electric motor

2.for accelerating water flow

4.none of these.

## Question: `If cohesion between the molecules of a fluid is more than adhesion between the fluid and glass, the free level of fluid in a dipped glass tube will be`

1. higher than the surface of liquid

2.same as the surface of liquid

3. lower than the surface of liquid

4.none of these.

1.Reynold number

2.Froude number

3.Weber number

4.Mach number.

## Question: `In a centrifugual pump casing, the flow of water leaving the impeller, is`

1.rectilinear flow

3. free vortex motion

4. forced vertex.

1.2 mm

2.4 mm

3.6 mm

4.10 mm

## Question: `﻿Liquids`

1.cannot be compressed

2.do not occupy definite shape

3. are not affected by change in pressure and temperature

4.none of these.

## Question: `Kinematic viscosity of liquids by equation is determined by :`

1.Redwood viscometer

2. Engler viscometer

3.Saybolt universal viscometer

4.None of these.

## Question: `Mach number is the ratio of inertia force to`

1.viscosity

2.surface tension

3.gravitational force

4.elasticity.

## Question: `Mercury is generally used in barometers because`

1. its vaour pressure is practically zero

2.the height of the barometer will be less

3.it is a best liquid

4.both (a) and (b) above

## Question: `Non-over flow double curvature concrete arch, is provided in`

1.Bhakra dam

2. Hirakund dam

3. Nagarjuna Sagar dam

4.Idukki dam.

## Question: `The continuity equation`

1.expresses the relationship between work and energy

2.relates the momentum per unit volume between two points on a stream line

3.relates mass rate of flow along a stream line

4.requires that Newton's second law of motion be satisfied at every point in fluid.

1.2 m

2.2.5 m

3. 3.0 m

4.4.0 m.

1.31.1 m/sec

2.31.2 m/sec

3.31.3 m/sec

4.31.4 m/sec.

## Question: `The main assumption of Bernoulli's equation is :`

1.The velocity of energy of liquid particle, across any cross-section of a pipe is uniform

2.No external force except the gravity acts on the liquid

3.There is no loss of energy of the liquid while flowing

4. All the above.

1.Euler number

2.Frode number

3.Reynold number

4.Weber number.

1.hyperbolic

2.circular

3.parabolic

4.elliptical.

## Question: `The velocity of the fluid particle at the centre of the pipe section, is`

1.minimum

2.maximum

3.equal throughout

4.none of these.

1.2°

2.3°

3.4°

4.5°

## Question: `When water flows over a rectangular suppressed weir, the negative pressure created beneath the nappe`

1.increases the discharge

2.decreases the discharge

3.does not effect the discharge

4.none of these.

## More MCQS

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