Q.1

The ratio of frictional factor and coefficient of friction used in general equation for a head loss in a pipe, is

  • 1
  • 2
  • 3
  • 4
Q.2

For the two dimensional flow, the stream function is given by ψ = 2xy. The velocity at a point (is

  • 6 m/sec
  • 8 m/sec
  • 10 m/sec
  • 12 m/sec
  • 15 m/sec.
Q.3

In an open tube, free surface of mercury remains

  • horizontal
  • curved upwards
  • curved downwards
  • none of these.
Q.4

Pick up the correct statement from the following :

  • Discharge over a triangular notch is proportional to H5/2
  • Discharge over a rectangular notch is proportional to H3/2
  • Both (a) and (b)
  • Neither (a) nor (b).
Q.5

Equation of continuity of fluids is applicable only if

  • flow is steady
  • flow is compressive
  • flow is one dimensional
  • velocity is uniform over the cross-sections
  • all the above.
Q.6

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

  • minimum
  • maximum
  • average of maximum and minimum
  • None of these.
Q.7

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

  • increases
  • decreases
  • remains unaffected
  • None of these.
Q.8

A rectangular channel 6 m wide and 3 m deep and having a bed slope as 1 inis running full. If Chezy's constant C = 54.pick up the correct specification of the channel from the following :

  • hydraulic mean depth = 1.5 m
  • Velocity of flow = 1.5 m/sec
  • Rate of flow = 27 m3/sec
  • All the above.
Q.9

Total pressure on the top of a closed cylindrical vessesl completely filled with liquid, is directly proportional to

  • radius
  • (radius)2
  • (radius)3
  • (radius)4
  • none of these.
Q.10

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

  • minimum
  • maximum
  • average of maximum and minimum
  • None of these.
Q.11

If the Mach number for a fluid flow is less thanthe flow is

  • sonic
  • supersonic
  • sub-sonic
  • none of these.
Q.12

Water flows through a convergent mouthpiece of diameter 4 cm at convergence under a head of 3 metres. If the maximum vacuum pressure is 9 metres of water, the maximum diameter of divergence, to aviod separation of flow, is

  • 4 cm
  • 6 cm
  • 2 cm
  • 23 cm.
Q.13

Molecules of fluids get attracted due to

  • capillarity action
  • surface tension
  • adhesion
  • cohesion
  • none of these.
Q.14

For the flow of liquid from an open ended tube (or nozzle) leading to the formation of spray of liquid drops, the number generally applied, is

  • Froude number
  • Weber number
  • Reynold number
  • Mach number.
Q.15

Flow in pipes is turbulent if Reynold number is

  • less than 2100
  • more than 3000
  • between 2100 and 3000
  • none of these.
Q.16

A floating body attains stable equilibrium if its metacentre is

  • at the centroid
  • above the centroid
  • below the centroid
  • anywhere.
Q.17

Molecules of fluids get attracted due to

  • capillarity action
  • surface tension
  • adhesion
  • cohesion
  • none of these.
Q.18

The flow in open channel is said to be subcritical if the Froude number is

  • less than 1.0
  • equal to 1.0
  • greater than 1.0
  • none.
Q.19

Mercury is generally used in barometers because

  • its vaour pressure is practically zero
  • the height of the barometer will be less
  • it is a best liquid
  • both (a) and (b) above
  • both (b) and (c) above.
Q.20

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

  • less than 1.0
  • equal to 1.0
  • greater than 1.0
  • None of these.
Q.21

In order to avoid capillary correction, the minimum diameter of a manometer used for measuring pressure, should be

  • 2 mm
  • 4 mm
  • 6 mm
  • 8 mm
  • 10 mm.
Q.22

Non-over flow double curvature concrete arch, is provided in

  • Bhakra dam
  • Hirakund dam
  • Nagarjuna Sagar dam
  • Idukki dam.
Q.23

Energy equation is usually applicable to

  • non-uniform flow
  • turbulent flow
  • laminar flow
  • steady flow.
Q.24

The flow is called rotational if its velocity normal to the plane of area is equal to

  • angular velocity vector
  • twice the angular velocity vector
  • thrice the angular velocity vector
  • none of these.
Q.25

Hydraulic coefficient of an orifice means the coefficient of

  • velocity
  • contraction
  • resistance
  • all the above.
Q.26

The upper surface of the weir over which water flows, is known as

  • vein
  • nappe
  • sill
  • none of these.
Q.27

The flow is called rotational if its velocity normal to the plane of area is equal to

  • angular velocity vector
  • twice the angular velocity vector
  • thrice the angular velocity vector
  • none of these.
Q.28

The upper surface of the weir over which water flows, is known as

  • vein
  • nappe
  • sill
  • none of these.
Q.29

An ideal fluid

  • is frictionless and incompressible
  • obeys Newton's law of velocity
  • is similar to gas
  • is very viscous.
Q.30

Cappoletti weir is a

  • rectangular weir whose length is kept 3 times the height of the water above sill
  • triangular weir whose notch angle is 90°
  • trapezoidal weir, whose sides slope 1 horizontal to 2 verticals
  • a combination of rectangular and triangular weirs.
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