Q.1

A body of dimensions 1.5 m x 1.0 m x 2 m weighskg in water. Its specific gravity is

  • 0.8
  • 0.9
  • 1.0
  • 1.1
Q.2

The metacentric height of a body equals the distance between

  • the centre of gravity and centre of buoyancy
  • the metacentre and centre of gravity
  • the centre of buoyancy and metacentre
  • none of these.
Q.3

Total energy line is

  • pressure head
  • datum head
  • kinetic head
  • All the above.
Q.4

'Flow net' can be drawn only if the flow is

  • turbulent
  • rotational
  • distortion
  • none of these.
Q.5

In a two dimensional flow if the components of the velocity are u = ax ; v = by, the point where no motion occurs, is known as

  • critical point
  • neutral point
  • stagnation point
  • stationary point
  • none of these.
Q.6

The flow in a channel is said to be non-uniform, if

  • free water surface of an open channel is not parallel to the bed of channel
  • head needed to overcome frictional reistance is less than the drop in elevation of channel bed
  • head needed to overcome frictional resistance is more than the drop in elevation of channel bed
  • all the above.
Q.7

The flow in which each liquid particle has a definite path and the paths of adjacent particles do not cross each other, is called

  • stream line flow
  • uniform flow
  • steady flow
  • turbulent flow.
Q.8

Though angle of deviation of liquid is more in internal mouth piece, the contraction of the jet, is

  • more in the internal mouth piece
  • less in the internal mouth piece
  • equal to external mouth piece
  • none of these.
Q.9

The hydrostatic force acts through

  • centre of pressure
  • centre of top edge
  • centre of bottom edge
  • metacentre.
Q.10

An orifice is called a large orifice if water head, is

  • twice the diameter of the orifice
  • thrice the diameter of the orifice
  • four times the diameter of the orifice
  • five times the diameter of the orifice.
Q.11

To ensure that water does not rise more thancm above the crest, for a discharge of 5.m3/sec, the length of water will be

  • 2.48 m
  • 2.49 m
  • 2.50 m
  • 2.51 m.
Q.12

The flow in a channel is said to be non-uniform, if

  • free water surface of an open channel is not parallel to the bed of channel
  • head needed to overcome frictional reistance is less than the drop in elevation of channel bed
  • head needed to overcome frictional resistance is more than the drop in elevation of channel bed
  • all the above.
Q.13

If H is height of the liquid above the sill, the effect of end contractions, according to Francis formula, is

  • 0.1 H
  • 0.2 H
  • 0.3 H
  • 0.4 H
  • 0.5 H.
Q.14

Discharge through a totally submerged orifice, is directly proportional to

  • difference in elevation of water surfaces
  • square root of the difference in elevation of water surface
  • square root of the opening
  • reciprocal of the area of the opening
  • none of these.
Q.15

For critical flow, the Froude number is :

  • 1.0
  • less than 1.0
  • more than 1.0
  • 2
Q.16

The flow in open channel is laminar if the Reynold number is

  • less than 500
  • more than 500
  • 1000
  • none of these.
Q.17

Most economical section of a circular channel for maximum velocity, is if,

  • depth of water = 0.810 diameter
  • hydraulic mean depth = 0.304 diameter
  • wetted perimeter = 2.245 diameters
  • all the above.
Q.18

In an inclined position, a venturimeter records

  • more reading
  • less reading
  • same reading
  • none of these.
Q.19

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

  • the bed width
  • one sloping side
  • the depth of flow
  • None of these.
Q.20

The flow in open channel is laminar if the Reynold number is

  • less than 500
  • more than 500
  • 1000
  • none of these.
Q.21

The pressure less than atmospheric , pressure, is known

  • suction pressure
  • vacuum pressure
  • negative gauge pressure
  • all the above.
Q.22

For solving the problems is hydraulic engineering, the velocity used is

  • velocity at the centre of pipe section
  • average velocity of flow over a section
  • mean of the velocities at the centre and that along the pipe surface
  • none of these.
Q.23

One metric slug is equal to

  • 1 kg wt
  • 9.81 kg wt
  • 9.81 kg mass
  • 0.98 kg wt.
Q.24

The dimensions MLT-2 refers to

  • specific weight
  • force
  • discharge
  • none of these.
Q.25

Pick up the correct statement from the following :

  • For maximum velocity of flow, the depth of water in the circular channel must be 0.81 times the diameter of the channel
  • For maximum velocity, the hydraulic mean depth must be 0.3 times the diameter of circular channel
  • For maximum discharge the depth of flow must be 0.95 times the diameter of circular channel
  • All the above.
Q.26

Frictional loss of head includes the loss of energy due to

  • viscosity
  • turbulence
  • both (a) and (b)
  • none of these.
Q.27

For solving the problems is hydraulic engineering, the velocity used is

  • velocity at the centre of pipe section
  • average velocity of flow over a section
  • mean of the velocities at the centre and that along the pipe surface
  • none of these.
Q.28

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

  • It converges upto Venacontracta and then diverges
  • In this mouth piece there is no loss of energy due to sudden enlargement
  • The coefficient of discharge is unity
  • All the above.
Q.29

If H is the difference of liquid levels on two sides of an orifice (width b, depth d), the discharge through the orifice will be

  • Cdbd22gH
  • Cdb2d2gH
  • Cdbd2gh
  • Cdbd.2g H1/2.
Q.30

The shape of fire hose nozzle is generally kept

  • divergent
  • convergent
  • convergent divergent
  • cylindrical.
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