# Engineering/Civil Engineering -MCQS-Hydraulics Section 5 Sample Test,Sample questions

1.2.4 cm

2.2.5 cm

3.2.6 cm

4.2.7 cm

1.0.1 H

2.0.2 H

3.0.3 H

4.0.4 H

## Question: ``` When the whole fluid mass rotates either due to fluid pressure or gravity or rotation previously imparted, the motion is known as```

1.free vortex

2. forced vortex

3.non-potential vortex

4.rotational vortex.

1.6% to 7%

2. 8% to 10%

3. 18% to 20%

4.25% to 30%

## Question: ``` An open container filled with water is moved vertically downward with a uniform linear acceleration. The pressure at its bottom will be```

1.greater than static pressure

2.equal to static pressure

3.lesser than static pressure

4.none of these.

## Question: ``` For steady flow in open channels, which one of the following does not change :```

1. depth of flow

2. velocity of flow

3.rate of flow

4.All of these.

## Question: ``` Frictional loss of head includes the loss of energy due to```

1.viscosity

2.turbulence

3.both (a) and (b)

4.none of these.

## Question: ``` Practical fluids possess```

1.viscosity

2.surface tension

3.compressibility

4. all the above.

## Question: ``` The flow in open channel is said to be critical if the Froude number is :```

1. less than 1.0

2.equal to 1.0

3.greater than 1.0

4.None of these.

## Question: ``` The line joining the points to which the liquid rises in vertical piezometer tubes fitted at different cross-sections of a conduit, is known as```

2. piezometric line

4. all the above.

## Question: ``` The most efficient channel section, is```

1.semi-circular

2.rectangular

3.triangular

4.half hexagon in the form of trapezoid.

1.0.5

2.1

3.1.5

4.2

## Question: ``` To measure very low pressure, we use```

1.barometers

2.piezometers

3.manometers

4.differential manometers.

## Question: `A rise or fall of liquid in a glass tube of a very small diameter when dipped is`

1.directly proportional to the force per unit length of periphery

2. direcly proportional to the sine of the angle of contact

3.directly proportional to the specific weight of liquid

4.inversely proportional to the diameter of the glass tube.

1.10° 5'

2. 10° 10'

3.10° 15'

4.10° 20'

## Question: `A triangular notch is preferred to a rectangular notch because`

2. its formula is simple to remember

3.it gives more accurate results for low discharge

4.all the above.

## Question: `An orifice is an opening in a vessel with`

1.closed perimeter of regular shape through which water flows

2.the water level of the liquid on the up stream side is below the top of the orifice

3.partially full flow

4.prolonged sides having length of 2 to 3 diameters of the opening in thick wall.

## Question: `Chezy's formula is used to determine`

1.head loss due to friction in pipe

2.velocity of flow in pipe

3.velocity of flow in open channels

4.none of these.

## Question: `Discharge through a totally submerged orifice, is directly proportional to`

1. difference in elevation of water surfaces

2.square root of the difference in elevation of water surface

3.square root of the opening

4.reciprocal of the area of the opening

## Question: `Equation of continuity of fluids is applicable only if`

2.flow is compressive

3. flow is one dimensional

4.all the above.

## Question: `Falling drops of water become spheres due to`

2.cohesion

3.surface tension

4.viscosity.

## Question: `For a most economical trapezoidal open channel, the half of the top width must be equal to`

1.the bed width

2. one sloping side

3.the depth of flow

4.None of these.

## Question: `For solving the problems is hydraulic engineering, the velocity used is`

1.velocity at the centre of pipe section

2.average velocity of flow over a section

3.mean of the velocities at the centre and that along the pipe surface

4.none of these.

## Question: `For uniform flow in canals`

1. there is a balance between the frictional loss and drop in elevation of the channel

2. bed and free water surfaces of a channel are parallel to each other

3.bed of channel represents the hydraulic gradient

4. all the above.

1.stoke

2.poise

3.Newton

4.none of these.

## Question: `In case of laminar flow through a circular pipe,`

1.momentum correction factor is 1.33

2.energy correction factor is 2.00

3.both (a) and (b)

4.Neither (a) nor (b).

## Question: `﻿An ideal fluid`

1.is frictionless and incompressible

2. obeys Newton's law of velocity

3.is similar to gas

4. is very viscous.

1.1 kg wt

2.9.81 kg wt

3.9.81 kg mass

4.0.98 kg wt.

## Question: `Pick up the correct statement from the following :`

1. In incompressible flow the density of a fluid remains constant

2.In compressible flow, the density of a fluid changes from point to point

3. In uniform flow, the velocity of a fluid does not change with respect to length of flow direction

4.All the above.

## Question: `Pick up the correct statement from the following :`

1.For maximum velocity of flow, the depth of water in the circular channel must be 0.81 times the diameter of the channel

2.For maximum velocity, the hydraulic mean depth must be 0.3 times the diameter of circular channel

3.For maximum discharge the depth of flow must be 0.95 times the diameter of circular channel

4.All the above.

## Question: `Pick up the correct statement regarding convergent divergent mouth piece from the following :`

1.It converges upto Venacontracta and then diverges

2.In this mouth piece there is no loss of energy due to sudden enlargement

3.The coefficient of discharge is unity

4. All the above.

## Question: `Pick up the incorrect statement from the following :`

1.In radial flow, fluid flows such that pressure and velocity at any point change with respect to its distance from the central axis

3.In radial flow, flow may take place radially inward to or outward from the centre

4. In radial flow, flow is one dimensional with stream lines parallel.

1.1.0 m

2.1.5 m

3.2.0 m

4.2.5 m

1.Bernoulli

2.Cauchy-Riemann

3.Laplace

4.Leonard Euler.

1.path line

2.stream line

3.potential line

4.streak line.

## Question: `The length of hydraulic jump is roughly`

1.2 to 3 times its height

2.3 to 5 times its height

3. 5 to 7 times its height

4.none of these.

## Question: `The metacentric height of a body equals the distance between`

1.the centre of gravity and centre of buoyancy

2. the metacentre and centre of gravity

3. the centre of buoyancy and metacentre

4.none of these.

## Question: `The pressure less than atmospheric , pressure, is known`

1.suction pressure

2.vacuum pressure

3.negative gauge pressure

4.all the above.

## Question: `The shape of fire hose nozzle is generally kept`

1.divergent

2.convergent

3.convergent divergent

4.cylindrical.

1.2.48 m

2.2.49 m

3.2.50 m

4.2.51 m

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