Q.1

Mach number is the ratio of inertia force to

  • viscosity
  • surface tension
  • gravitational force
  • elasticity.
Q.2

Hydraulic ram is a device

  • for lifting water without an electric motor
  • for accelerating water flow
  • for lifting heavy loads
  • none of these.
Q.3

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

  • potential head and kinetic head
  • kinetic head and pressure head
  • potential head and pressure head
  • potential head, kinetic head and pressure head.
Q.4

The discharge over a Cipolletti weir of length 2.m when the head over the weir is 1 m, is

  • 2.0 m3
  • 2.5 m3
  • 3.0 m3
  • 4.0 m3.
Q.5

The ratio of the percentagge error in the discharge and percentage error in the measurement of head over a triangular notch, is

  • 2/3
  • 3/2
  • 2/5
  • 5/2
Q.6

In a venturimeter, the divergent cone is kept

  • shorter than convergent cone
  • equal to covergent cone
  • longer than convergent cone
  • none of these.
Q.7

If Re is the Renold's number, the coefficient of friction for laminar flow is

Q.8

For a long pipe, the head loss

  • at the entrance is ignored
  • at the outlet is ignored
  • at the entrance and outlet both are ignored
  • due to friction is ignored.
Q.9

Poise is the unit of

  • viscosity
  • velocity gradient
  • mass density
  • kinematic viscous.
Q.10

In a venturimeter, the divergent cone is kept

  • shorter than convergent cone
  • equal to covergent cone
  • longer than convergent cone
  • none of these.
Q.11

Uniform flow is said to occur when

  • size and shape of the cross-section in a particular length remain constant
  • size and shape of the cross-section change along a length
  • frictional loss in the particular length of the channel will the more than the drop in its elevation
  • frictional loss in the particular length of the channel, will be less than the drop in elevation.
Q.12

Gauge pressure is

  • absolute pressure - atmospheric pressure
  • absolute pressure + atmospheric pressure
  • atmospheric pressure - absolute pressure
  • none of these.
Q.13

For exerting a pressure of 4.8 kg/cm2, the depth of oil (specific gravity 0.8), should be

  • 40 cm
  • 41 cm
  • 56 cm
  • 60 cm
  • 76 cm.
Q.14

For maximum horse power of a nozzle, the head supplied must be equal to

  • head loss in the pipe due to friction
  • twice the head loss in the pipe due to friction
  • thrice the head loss in the pipe due to friction
  • four times the head loss in the pipe due to friction.
Q.15

When a liquid rotates at constant angular velocity about a vertical axis of a rigid body, the pressure

  • increases linearly to its radial distance
  • varies inversely as the altitude along any vertical line
  • varies as the square of the radial distance
  • decreases as the square of the radial distance
  • none of these.
Q.16

Most economical section of a triangular channel, is

  • equilateral triangle
  • right angled triangle
  • isosceles triangle with 45° vertex angle
  • right angled triangle with equal sides.
Q.17

Equation of continuity of flow is based on the principle of conservation of

  • mass
  • momentum
  • force
  • none of these.
Q.18

The velocity distribution of viscous fluid through a circular/pipe is :

  • hyperbolic
  • circular
  • parabolic
  • elliptical.
Q.19

If v1 and v2 are the velocities of flow before and after sudden enlargement in a pipe, the head loss given by Carnot and Borda equation, is

  • (v22 - v12)/2g
  • (v1 - v2)2/2g
  • (v2 - v1)2/2g
  • (v1 + v2)2/2g.
Q.20

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

  • minimum
  • maximum
  • equal throughout
  • none of these.
Q.21

The ratio of the inertia and gravitational force acting in any flow, ignoring other forces, is called

  • Euler number
  • Frode number
  • Reynold number
  • Weber number.
Q.22

Specific weight of sea water is more than that of pure water because of

  • dissolved air
  • dissolved salts
  • suspended matter
  • all the above.
Q.23

On a flow net diagram, the distance between two consecutive steam lines at two successive sections are 1 cm and 0.5 cm respectively. If the velocity at the first section is 1 m/sec, the velocity at the second is

  • 1.0 m/sec
  • 0.5 m/sec
  • 2.0 m/sec
  • 2.5 m/sec
  • 3 m/sec.
Q.24

The length of pipe is L, velocity of flow of a liquid in the pipe is V. If t is the time in second required to close the valve, the head of pressure

  • none of these.
Q.25

Hydraulic grade line

  • remains above the centre line of conduit
  • remains below the centre line of conduit
  • remains parallel to the centre line of conduit
  • may be above or below the centre line of conduit.
Q.26

For mountaneous regions having steep slope, wagons for carrying liquid are made with bottom

  • parallel to the road surface
  • parallel to the horizontal surface
  • inclined upward while moving upwards
  • inclined downward while moving downwards.
Q.27

Hydraulic grade line

  • remains above the centre line of conduit
  • remains below the centre line of conduit
  • remains parallel to the centre line of conduit
  • may be above or below the centre line of conduit.
Q.28

The main assumption of Bernoulli's equation is :

  • The velocity of energy of liquid particle, across any cross-section of a pipe is uniform
  • No external force except the gravity acts on the liquid
  • There is no loss of energy of the liquid while flowing
  • All the above.
Q.29

A cylindrical vesselcm high is revolved about its vertical axis so that the water touches the bottom when it just spills out. If the radius of the cylinder is 5 cm, the angular velocity of rotation, is

  • 2 rad/sec
  • 3 rad/sec
  • 4 rad/sec
  • 5 rad/sec
  • none of these.
Q.30

The main assumption of Bernoulli's equation is :

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