Q.1

Acceleration head in a reciprocating pump

  • increases the work done during delivery stroke.
  • decreases the work done during suction stroke.
  • does not change the work requirement of the pump.
  • increases the work done during suction stroke.
Q.2

The ratio of width to depth for the most economical rectangular section in open channel flow is

  • 0.5
  • 1
  • 1.5
  • 2
Q.3

A mono pump is a __________ pump.

  • centrifugal
  • piston
  • positive acting rotary
  • a group of vacuum
Q.4

Euler's equation of motion states, that at every point, the

  • fluid momentum is constant.
  • force per unit mass equals acceleration.
  • rate of mass outflow is equal to the rate of mass inflow.
  • none of these.
Q.5

What is the normal range of exit cone angle of a venturimeter ?

  • 2 to 5
  • 7 to 15
  • 15 to 25
  • >25
Q.6

The maximum delivery pressure of compressors can be upto __________ atmospheres.

  • 10
  • 100
  • 250
  • 1000
Q.7

When the momentum of one fluid is used for moving another fluid, such a device is called a/an

  • jet pump
  • blower
  • acid egg
  • none of these
Q.8

An ideal nozzle design aims at

  • minimising wall friction.
  • suppressing boundary layer separation.
  • both (a) & (b).
  • neither (a) nor (b).
Q.9

Which of the following is the most common pump for pumping either raw sewage or sludge ?

  • Electromagnetic pump
  • Centrifugal pump
  • Reciprocating pump
  • Gear pump
Q.10

A centrifugal pump has the following specifications:
Power = 4 H.P.; Speed =rpm
Head = 8 metres
Flow =litres/minutes.
If its speed is halved, the new discharge will be __________ litres/minute.

  • 500
  • 200
  • 1000
  • 750
Q.11

For laminar flow of Newtonion fluid in a circular pipe, the velocity distribution is a function of the distance 'd' measured from the centre line of the pipe, and it follows a __________ relationship.

  • logarithmic
  • parabolic
  • hyperbolic
  • linear
Q.12

A pitched-blade turbine draws __________ a straight blade turbine.

  • less power than
  • more power than
  • same power as
  • data insufficient to predict
Q.13

Which of the following pipe bends will incur the largest head loss ?

  • U-bend
  • 30° bend
  • 45° bend
  • 90° bend
Q.14

Boundary layer separation is caused by the

  • reduction of pressure to vapour pressure.
  • boundary layer thickness reducing to zero.
  • adverse pressure gradient.
  • reduction of pressure gradient to zero.
Q.15

Manometers measure the __________ pressure.

  • vacuum as well as the atmospheric
  • difference in
  • absolute
  • gage
Q.16

Drag force acting on a body does not depend upon the

  • density of the fluid.
  • density of the body.
  • velocity of the body.
  • projected area of the body.
Q.17

For flow through an orifice from a reservoir, the actual velocity at the vena con-tracta is given by

  • 2gh
  • C.V. 2gh
  • Cd 2gh
  • Cc 2gh
Q.18

Centre of pressure in an immersed body is __________ the centre of gravity.

  • above
  • below
  • at
  • either above or below; depends on the liquid density
Q.19

Bernoulli's equation is dependent on the

  • first law of thermodynamics.
  • third law of thermodynamics.
  • law of conservation of momentum.
  • none of these.
Q.20

The ratio of inertial forces to elastic forces is called the __________ number.

  • Reynolds
  • Mach
  • Euler
  • Weber
Q.21

The simple pitot tube measures the __________ pressure.

  • static
  • dynamic
  • total
  • none of these
Q.22

Higher specific speed (200-of a centrifugal pump indicates that the pump is of __________ flow type.

  • axial
  • radial
  • mixed
  • none of these
Q.23

The Navier-Stokes equation deals with the law of conservation of

  • mass
  • energy
  • both (a) & (b)
  • momentum
Q.24

The dimension of dynamic viscosity is

  • ML-1T-1
  • L2T-1
  • LT-2
  • ML-1T-2
Q.25

Dimension of surface tension is(where, F = force, L = length)

  • FL-1
  • F-1 . L
  • F.L-2
  • F-2 . L
Q.26

The normal stress is the same in all directions at a point in a fluid, when the fluid is

  • non-viscous.
  • incompressible.
  • both (a) and (b).
  • having no motion of one fluid layer relative to the other.
Q.27

Which of the fluid forces are not considered in the Reynold's equation of flow ?

  • Viscous forces
  • Turbulent forces
  • Pressure forces
  • Compressibility forces
Q.28

Transition length for a turbulent fluid entering into a pipe is around __________ times the pipe diameter.

  • 5
  • 50
  • 500
  • 1000
Q.29

The dimension of kinematic viscosity is

  • ML-2T-1
  • L2T-1
  • ML-2T-2
  • none of these
Q.30

The Prandtl mixing length is

  • zero at the pipe wall and is a universal constant.
  • independent of radial distance from the pipe axis.
  • independent of the shear stress.
  • useful for computing laminar flow problems.
Q.31

The pressure head of a flow meter remains constant for

  • venturimeter
  • orificemeter
  • rotameter
  • pitot tube
Q.32

The most suitable flow measuring device for the fluid flow measurement in a very large diameter pipeline is a

  • weir
  • pitot tube
  • Kennison nozzle
  • V-notch
Q.33

Which is the most efficient and best for measuring very small flow rate of gases ?

  • Venturimeter
  • Orifice meter
  • Rotameter
  • Flow nozzle
Q.34

In an incompressible fluid, the density is

  • greatly affected by moderate changes in pressure.
  • greatly affected only by moderate changes in temperature.
  • not affected with moderate change in temperature & pressure.
  • sensible to changes in both temperature & pressure.
Q.35

With increase in temperature, the vapor pressure of liquids

  • increases
  • increases linearly
  • decreases
  • remains constant
Q.36

Centrifugal pump is normally classified on the basis of the

  • rpm.
  • type of casing.
  • impeller blade angle.
  • number of blades in impeller.
Q.37

Pascal law is not applicable for a/an __________ fluid.

  • accelerating frictionless
  • static
  • uniformly moving
  • none of these
Q.38

The continuity equation

  • is independent of the compressibility of the fluid.
  • is dependent upon the viscosity of the fluid.
  • represents the conservation of mass.
  • none of these.
Q.39

The variable required to be known in correlations used for estimating the horse power of a centrifugal gas compressor and hence its cost are
P. Inlet pressure Q. Compressor rpm
R. Delivery pressure S. Volumetric flow rate at inlet.

  • P, Q and R
  • P and R
  • R and S
  • P, Rand S
Q.40

A differential pressure cell is used for

  • measuring small pressure difference in gases.
  • measuring small pressure difference in liquids.
  • remote recording of pressure difference.
  • measuring the difference of the impact & the static pressure.
Q.41

Which of the following is not a dimension-less parameter ?

  • Euler number
  • Specific gravity
  • Fanning friction factor
  • None of these
Q.42

Head developed by a centrifugal pump depends on its

  • speed
  • impeller diameter
  • both (a) and (b)
  • neither (a) nor (b)
Q.43

For ideally incompressible fluid, the Mach number will be

  • 1.5
  • 1
  • 0
  • 5
Q.44

For turbulent flow of an incompressible fluid through a pipe, the flow rate Q is proportional to (Δ P)n, where ΔP is the pressure drop. The value of exponent 'n' is

  • 1
  • 0
  • < 1
  • > 1
Q.45

A pipe of I.D. 4 m is bifurcated into two pipes of I.D. 2 m each. If the average velocity of water flowing through the main pipe is 5 m/sec, the average velocity through the bifurcated pipes is

  • 20 m/sec
  • 10 m/sec
  • 52 m/sec
  • 5 m/sec
Q.46

Consider a centrifugal pump having a specific impeller diameter, fixed impeller speed pumping a liquid of constant density at a particular discharge capacity. With decrease in the capacity of the pump, the __________ decreases.

  • NPSH required.
  • BHP required by the pump.
  • head of the liquid pumped.
  • all (a), (b) and (c).
Q.47

Which of the following is an undesirable property of a manometric liquid ?

  • Non-sticky & non-corrosive nature.
  • High vapour pressure.
  • Low viscosity & surface tension.
  • Low co-efficient of thermal expansion.
Q.48

Which of the following options will facilitate the achievement of a very high head (saymetres) in case of a centrifugal pump?

  • Increasing the impeller speed and the volute area.
  • Increasing the number of vanes in the impeller.
  • Mounting of two or more impellers in series on a single shaft.
  • Either of (a), (b) or (c).
Q.49

N2Re/NFr is called the __________ number.

  • Brinkman
  • Galileo
  • Archimedes
  • Euler
Q.50

The ratio of hydrodynamic boundary layer to thermal boundary layer thickness in case of liquid metals is

  • < 1
  • 1
  • > 1
  • 2
0 h : 0 m : 1 s