Q.1

The unit of bulk modulus of elasticity for a liquid in S.I. unit is

  • N
  • N/m
  • N/m2
  • N/m3
Q.2

Power requirement of fans having constant wheel diameter varies __________ fan speed.

  • as square of
  • directly as
  • as cube of
  • none of these
Q.3

Pick out the wrong statement.

  • The form drag is dependent upon the occurrence of a wake.
  • The shear stress at any given cross-section of a pipe for steady flow (either laminar or turbulent) varies linearly as the radial distance.
  • An ideal fluid is the one, which has negligible surface tension and obeys the Newton's law of viscosity.
  • Existence of the boundary layer in fluid flow is because of viscosity of the fluid.
Q.4

For flow of fluids through packed bed, the superficial velocity is

  • less than the average velocity through channels.
  • more than the average velocity through channels.
  • dependent on the pressure drop across the bed.
  • same as the average velocity through channels.
Q.5

The rate of shear versus the shear stress curves are time dependent for __________ fluid.

  • thixotropic
  • rheopectic
  • both (a) & (b)
  • neither (a) nor (b)
Q.6

In a/an __________ , the flow rate of fluids is obtained by measuring the difference between the impact and the static pressure.

  • rotameter
  • pitot tube
  • venturimeter
  • flow nozzle
Q.7

In fluid flow, the boundary layer separation can not occur

  • in case of boundaries experiencing form drag.
  • at points of abrupt changes in the flow directions.
  • in laminar flow.
  • none of these.
Q.8

For the laminar flow of a fluid in a circular pipe of radius R, the Hagen-Poisseule equation predicts the volumetric flow rate to be proportional to

  • R
  • R2
  • R4
  • R0.5
Q.9

Interstage coolers are provided in a multistage compressor to

  • save power in compressing a given volume to a given pressure.
  • cool the delivered air.
  • achieve the exact delivery pressure.
  • none of these.
Q.10

Self-priming centrifugal pump can be used for

  • booster service.
  • pumping liquid fertilisers (e.g. liquid NH3).
  • pumping industrial wastes.
  • all (a), (b) and (c).
Q.11

Maintenance cost of a __________ pump for a particular duty is the least.

  • centrifugal
  • reciprocating
  • volute
  • gear
Q.12

Foot valves are provided in the suction line of a centrifugal pump to

  • avoid priming, every time we start the pump.
  • remove the contaminant present in the liquid.
  • minimise the fluctuation in discharge.
  • control the liquid discharge.
Q.13

An ideal fluid is

  • frictionless & incompressible.
  • one, which obeys Newton's law of viscosity.
  • highly viscous.
  • none of these.
Q.14

Correction for capillary effect in manometers (used for pressure measurement) need not be applied, if diameter of the manometer tube is __________ mm.

  • < 4
  • > 4
  • > 12.5
  • < 10
Q.15

Differential manometer measures the

  • absolute pressure
  • gauge pressure
  • pressure difference
  • pressure gradient
Q.16

A piezometer opening measures the __________ fluid pressure.

  • static
  • undisturbed
  • total
  • dynamic
Q.17

Dean number is concerned with the

  • fluid-particle interaction.
  • fluid flow through helical pipes.
  • power consumption in agitated vessels.
  • psychrometry.
Q.18

The equation given below is called the __________ .

f-0.5 = 4.loge (NRef)-0.6

  • Colebrook formula
  • Von-Karman equation
  • Fanning equation
  • none of these
Q.19

Purpose of hydraulic accumulator is to

  • ensure intermittant supply of hydraulic pressure.
  • increase the pressure and store/ accumulate it.
  • accumulate pressure to increase force.
  • generate high pressure to operate hydraulic machines like cranes, lifts, presses etc
Q.20

At a constant speed of the centrifugal pump . it __________ the impeller diameter.

  • capacity varies directly with
  • head varies as the square of
  • horsepower varies as the cube of
  • all (a), (b) and (c)
Q.21

In the low Reynolds number region, the drag force on a sphere is proportional to

  • V
  • V2
  • V4
  • V0.5
Q.22

Mass velocity is independent of temperature & pressure, when the flow is

  • unsteady through unchanged cross-section.
  • steady through changing cross-section.
  • steady and the cross-section is unchanged.
  • unsteady and the cross-section is changed.
Q.23

Cd is always __________ Cc.

  • greater than
  • less than
  • equal to
  • either more or less than
Q.24

Buoyant force

  • for non-symmetrical bodies is not vertical.
  • depends on the depth of the submergence of the floating body.
  • depends on the weight of the floating body.
  • none of these.
Q.25

In Newton's law range, the drag co-efficient for the motion of spherical particle in a stationary fluid is

  • 0.44
  • 0.044
  • 4.4
  • 44
Q.26

A pressure ofm head of water is equivalent to __________ kN/m2.

  • 98
  • 147
  • 196
  • 49
Q.27

Speed of sound in an ideal gas depends on its

  • temperature
  • pressure
  • specific volume
  • none of these
Q.28

The Prandtl pitot tube measures the

  • velocity at a point in the flow.
  • pressure at a point.
  • average flow velocity.
  • pressure difference in pipe flow.
Q.29

For a given fluid flow rate, which of the following incurs maximum head loss ?

  • Orifice meter
  • Venturimeter
  • Flow nozzle
  • All of them incur the same head loss
Q.30

Water hammer is caused, when water flowing in a pipe is suddenly brought to rest by closing the valve. The extent of pressure thus produced due to water hammer depends on the

  • pipe length
  • fluid velocity in the pipe
  • time taken to close the valve
  • all (a), (b) and (c)
Q.31

The capacity of an accumulator is the maximum

  • energy which it can store.
  • discharge which it can deliver.
  • liquid which it can store.
  • none of these.
Q.32

Choking in case of pipe flow means that a

  • specified mass flow rate can not be achieved.
  • valve is closed in the line.
  • restriction in flow cross-section area occurs.
  • none of these.
Q.33

Choose the correct set of dimensions of viscosity that are equivalent (where, F, M, L, T are dimensions for force, mass, length and time respectively).

  • FL-2T, ML-1T-1
  • FLT, ML-1T-1
  • ML-1T-3, F-1L2T
  • F-1L2T-1, MLT-3
Q.34

Two dimensional stream function

  • relates velocity and pressure.
  • is constant along a stream line.
  • is constant along an equipotential surface.
  • none of these.
Q.35

The pressure and power requirement of a gas fan at constant speed & capacity varies __________ the gas density.

  • directly as
  • inversely as square root of
  • inversely as
  • as square of
Q.36

Pick out the wrong statement.

  • Surface tension of a liquid is because of the difference in magnitude of adhesive & cohesive forces.
  • A hydrometer used for the determination of specific gravities of liquids works on the principle of buoyant forces.
  • In case of unsteady fluid flow, the velocity at any given point does not change with time.
  • Turbulent fluid flow is characterised by the rapid fluctuation of instantaneous pressure & velocity at a point.
Q.37

The pressure co-efficient is the ratio of pressure forces to __________ forces.

  • viscous
  • inertial
  • gravity
  • surface tension
Q.38

Very small pressure difference (< 5 mm water coloumn) can be most conveniently measured by a/an __________ manometer.

  • U-tube water.
  • U-tube mercury.
  • inclined tube mercury.
  • inclined tube water.
Q.39

A pressure head ofmetres of water in meters of CCl4 (sp.gr = 1.will be

  • 100
  • 200
  • 320
  • 160
Q.40

A centrifugal pump designed for handling water (μ = 1 cp) will deliver __________ when pumping a thicker oil (μ =cp).

  • less head & capacity
  • more head
  • more capacity
  • less head & more capacity
Q.41

If 'x' is the depth of flow in an open channel of large width, then the hydraulic radius is equal to

  • x
  • x/2
  • x/3
  • 2x/3
Q.42

Hydraulic intensifier is used for increasing the

  • rate of velocity of liquid supply.
  • rate of flow through delivery pipeline of a pump.
  • intensity of pressure of the liquid.
  • momentum rate through delivery pipe.
Q.43

Which of the following assumptions enables the Euler's equation of motion to be integrated ?

  • The fluid is incompressible.
  • The fluid is non-viscous.
  • The continuity equation is satisfied.
  • The flow is rotational and incompressible.
Q.44

Bernoull's equation does not apply to the functioning of a/an

  • venturimeter
  • orificem
  • pitot tube
  • none of these
Q.45

With increase in the temperature, viscosity of a liquid

  • increases
  • decreases
  • remains constant
  • may increase or decrease; depends on the liquid
Q.46

Velocity of liquid hydrocarbon fuels in a pipeline can not be measured by magnetic flowmeters, because their __________ is very low/small.

  • thermal conductivity
  • electrical conductivity
  • specific gravity
  • electrical resistivity
Q.47

The line of action of the buoyant force passes through the centre of gravity of the

  • submerged body.
  • displaced volume of the fluid.
  • volume of fluid vertically above the body.
  • horizontal projection of the body.
Q.48

What causes cavitation in centrifugal pump ?

  • High suction pressure
  • Low barometric pressure
  • Low suction pressure
  • High suction velocity
Q.49

Isothermal turbulent flow of a fluid results in decrease of its pressure, which depends on the

  • wall roughness.
  • Reynolds number.
  • both (a) & (b).
  • neither (a) nor (b).
Q.50

For pipe flows, head is proportional to __________ at constant capacity(where, D = pipe diameter).

  • 1/D
  • 1/D2
  • 1/D5
  • D2
0 h : 0 m : 1 s