Hydraulics MCQ Practice Questions (Civil Engineering) Set 8

In fluids, steady flow occurs when:


Options are :

  • Velocity vector remains constant at a point
  • Conditions of flow do not change with time at a point
  • Conditions of flow change steadily with time
  • Conditions of flow remain the same at adjacent point

Answer :Conditions of flow do not change with time at a point

The main assumption of Bernoulli's equation is:


Options are :

  • The velocity of energy of liquid particle, across any cross-section of a pipe is uniform
  • There is no loss of energy of the liquid while flowing
  • No external force except the gravity acts on the liquid
  • All the above

Answer :All the above

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


Options are :

  • Half the width
  • One-fourth of the width
  • Three times the hydraulic radius
  • Hydraulic mean depth
  • None of these

Answer :Half the width

Hydraulics MCQ Practice Questions (Civil Engineering) Set 2

The height of water level in a tank above the centre of a circular hole 2.5 cm in diameter is 50 m. The velocity of water flowing through the hole, is:


Options are :

  • 31.3 m/sec
  • 31.1 m/sec
  • 31.4 m/sec
  • 31.2 m/sec

Answer :31.3 m/sec

The discharge over a Cipolletti weir of length 2.185 m when the head over the weir is 1 m, is:


Options are :

  • 2.5 m^(3)
  • 2.0 m^(3)
  • 4.0 m^(3)
  • 3.0 m^(3)

Answer :4.0 m^(3)

The terminal velocity (v) of a sphere of radius r and specific weight W, which travels vertically downwards in a liquid of viscosity ? and specific weight W, is:


A.


B.


C.


D.


Options are :

  • A
  • D
  • B
  • C

Answer :B

Hydraulics MCQ Practice Questions (Civil Engineering) Set 4

Liquids:


Options are :

  • Do not occupy definite shape
  • Are not affected by change in pressure and temperature
  • None of these
  • Cannot be compressed

Answer :Do not occupy definite shape

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


Options are :

  • Fluid is viscous
  • Fluid is homogeneous and incompressible
  • Velocity of flow is non-uniform over the section
  • Flow is unsteady along the stream line

Answer :Fluid is homogeneous and incompressible

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


Options are :

  • None of these
  • Increases the discharge
  • Decreases the discharge
  • Does not effect the discharge

Answer :Increases the discharge

Irrigation MCQ Practice Questions (Civil Engineering) Set 4

Cavitation is caused by:


Options are :

  • High velocity
  • None of these
  • High pressure
  • Low velocity
  • Low pressure

Answer :Low pressure

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


Options are :

  • Maximum
  • Equal throughout
  • None of these
  • Minimum

Answer :Maximum

Total head of a liquid particle in motion is the sum of:


Options are :

  • Potential head and pressure head
  • Potential head, kinetic head and pressure head
  • Potential head and kinetic head
  • Kinetic head and pressure head

Answer :Potential head, kinetic head and pressure head

RCC Structures Design MCQ Practice Questions (Civil Eng) Set 6

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


Options are :

  • Forced vertex
  • Rectilinear flow
  • Free vortex motion
  • Radial flow

Answer :Free vortex motion

A closed cylindrical vessel of 100 cm diameter and 200 cm high is completely filled with a liquid (sp. weight 1600 kg/m3) when rotated about its vertical axis at 100 r.p.m.

The total pressure on its lid, is


Options are :

  • 459 kg
  • 945 kg
  • 95.4 kg
  • 954 kg
  • 549 kg

Answer :954 kg

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


Options are :

  • Decreases
  • Remains unaffected
  • Increases
  • None of these

Answer :Increases

Hydraulics MCQ Practice Questions (Civil Engineering) Set 9

If jet of water coming out from a nozzle with a velocity 9.81 m/s, the angle of elevation being 30, the time to reach the highest point is:


Options are :

  • 0.25 s
  • 1.5 s
  • 1.0 s
  • 0.50 s

Answer :0.50 s

The discharge through a 100 mm diameter external mouth piece fitted to the side of a large vessel is 0.05948 m^(3)/s

The head over the mouth piece is:


Options are :

  • 3.0 m
  • 2 m
  • 4.0 m
  • 2.5 m

Answer :4.0 m

Hydraulic gradient is equal to difference in water surfaces:


A.


B.


C.


D.


Options are :

  • A
  • D
  • C
  • B

Answer :B

Hydraulics MCQ Practice Questions (Civil Engineering) Set 8

Mercury is generally used in barometers because:


Options are :

  • It is a best liquid
  • None of these
  • Its vapour pressure is practically zero
  • The height of the barometer will be less

Answer :Its vapour pressure is practically zero The height of the barometer will be less

The mouth piece shown in the below figure is generally known as:


Options are :

  • Re-entrant mouth piece
  • All the above
  • Internal mouth piece
  • Borda's mouth piece

Answer :All the above

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:


Options are :

  • Same as the surface of liquid
  • Lower than the surface of liquid
  • None of these
  • Higher than the surface of liquid

Answer :Lower than the surface of liquid

Concrete Technology MCQ Practice Questions (Civil Eng) Set 7

Flow in pipes is laminar if Reynold number is:


Options are :

  • Less than 2100
  • None of these
  • Between 2100 and 3000
  • More than 3000

Answer :Less than 2100

Hydraulic ram is a device:


Options are :

  • For accelerating water flow
  • For lifting water without an electric motor
  • For lifting heavy loads
  • None of these

Answer :For lifting water without an electric motor

If u, v, w are the components of the velocity v of a moving particle, the equation

represents:


Options are :

  • None of these
  • Two dimensional flow
  • One diamensional flow
  • Three dimensional flow

Answer :Three dimensional flow

RCC Structures Design MCQ Practice Questions (Civil Eng) Set 5

In pipe lines, a surge tank is provided:


Options are :

  • To provide additional water head
  • To remove the frictional loss in pipe
  • To overflow the pipe line when suddenly closed
  • To relieve the pressure due to water hammer

Answer :To relieve the pressure due to water hammer

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


Options are :

  • Minimum
  • Maximum
  • None of these
  • Average of maximum and minimum

Answer :Minimum

The valve closure is said to be sudden if:


A.


B.


C.


D.


Options are :

  • D
  • C
  • A
  • B

Answer :B

RCC Structures Design MCQ Practice Questions (Civil Eng) Set 7

An orifice is taken as large if:


Options are :

  • (H2 - H1) > H/4
  • (H2 - H1) > H/2
  • (H2 - H1) > H/3
  • (H2 - H1) > H

Answer :(H2 - H1) > H/3

Mach number is the ratio of inertia force to:


Options are :

  • Gravitational force
  • Surface tension
  • Viscosity
  • Elasticity

Answer :Elasticity

The continuity equation:


Options are :

  • Relates the momentum per unit volume between two points on a stream line
  • Requires that Newton's second law of motion be satisfied at every point in fluid
  • Expresses the relationship between work and energy
  • Relates mass rate of flow along a stream line

Answer :Relates mass rate of flow along a stream line

Hydraulics MCQ Practice Questions (Civil Engineering) Set 9

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