Volute of a centrifugal pump should be designed in a fashion, such that the

An ideal plastic substance indicates no deformation, when stressed upto yield stress, but behaves like a Newtonion fluid beyond yield stress. Which of the following is an ideal plastic ?

At what value of crank angle (roughly), no flow of water from or into the air vessel takes place in case of a double acting reciprocating pump ?

The equivalent diameter for pressure drop calculation for a fluid flowing through a rectangular cross-section channels having sides 'x' & 'y' is given by

Various efficiencies of a centrifugal pump are related as (where, η_m = mechanical efficiency η_v = volumetric efficiency. η_ma = manometric efficiency η_o = overall efficiency)

It is possible to integrate an automatic flow controller to a

Dimension of kinematic viscosity is

Pumping of a corrosive liquid is generally preferred to be done by a __________ pump, as it can be made of a variety of materials including plastics.

Agate valve fitted in a pipe is replaced by a similar globe valve. Pressure drop in gate valve was Δp. For the same discharge, the pressure drop across globe valve is

The equation relating friction factor to Reynold number, f^-0.5 = 4 log_e (N_Re/f)^-0.4, is called the __________ equation.

For water, when the pressure increases, the viscosity

For turbulent fluid flow in pipe, the expression for Prandtl one seventh power law is (where, r = pipe radius, x = distance).

A fluid is a substance, that

Cavitation in a centrifugal pump can be avoided by keeping the

For a given Reynolds number, in a hydraulically smooth pipe, further smoothening __________ the friction factor.

Pick out the correct statement.

For flow past a flat plate, if x is the distance along the plate in the direction of flow, the boundary layer thickness is proportional to

The specific speed of a pump is defined as the speed of a unit of such a size, that it

In case of centrifugal fan or blower, the gas capacity varies as

Unsteady non-uniform flow is represented by flow through a/an

Pick out the correct statement.

The head loss due to sudden contraction is proportional to

The capacity of a centrifugal pump Can be increased by increasing the

The range of a particular rotameter can be increased by

Glass pipes can be joined by

A streamline is a line in flow field,

The main factor on which the behaviour of a mass of fluidised solid depends mainly is the

The contraction co-efficient for Borda's mouthpiece (for frictionless fluid) is

Which of the following has the maximum compression ratio ?

The pressure intensity is the same in all directions at a point in a fluid

Vane anemometer

Power number is the ratio of

The friction factor is

Pick out the wrong statement.

Prandtl number is a measure of the

What is the unit of kinematic viscosity in SI unit ?

Cavitation occurs in a centrifugal pump when the suction pressure is

Which law is followed by the velocity distribution in the turbulent boundary layer?

Which of the following is dimensionless ?

If two capillary tubes of dia 0.5 mm and 1 mm are dipped in a pot containing mercury, then the rise of mercury is

While starting an axial flow pump, its delivery valve should be kept

What is the speed of sound (m/sec) in ordinary water ?

Purpose of air lift pump is to

What is the co-efficient of contraction, if a fluid jet discharging from amm diameter orifice has amm diameter at its vena-contracta ?

Scale up of agitator design requires

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

The head loss due to sudden expansion is

The losses in open channel flow generally vary as the

A liquid is pumped at the rate oflitres usingrpm. If the rpm is changed tothe liquid pumped is __________ litres.

For laminar flow of a shear thinning liquid in a pipe, if the volumetric flow rate is doubled, the pressure gradient will increase by a factor of