Explore topic-wise MCQs in Engineering.

When the cross-section of a nozzle increases continuously from entrance to exit, it is called a

The effect of friction in the nozzle __________ dryness fraction of steam.

The discharge through a nozzle is maximum for a certain value of exit pressure. This pressure is known as critical pressure.

The critical pressure ratio for initially dry saturated steam is

In a reaction turbine, when steam flows through the moving blades,

In a nozzle, the effect of supersaturation is to

The pressure velocity compounded impulse turbine allows a bigger pressure drop and hence __________ number of stages are required.

If the critical pressure ratio for steam is 0.546, then the steam is initially

Which of the following statement is wrong?

A steam turbine, in which a part of the steam after partial expansion, is used for process heating and the remaining steam is further expanded for power generation, is known as

The stage efficiency is the ratio of energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam.

Stage efficiency is also known as

The pressure of steam __________ while flowing through a nozzle.

The process of maintaining the speed of the turbine constant for various load conditions, is known as

Reheating of steam in a turbine

Which of the following statement is correct for steam turbines as compared to reciprocating steam engines?

The density of supersaturated steam is about __________ that of the ordinary saturated vapour at the corresponding pressure.

The ratio of the energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam is called mechanical efficiency.

In a velocity compounded impulse turbine, when steam flows through the second row of moving blades,

The maximum discharge of steam through a convergent-divergent nozzle depends upon

A single stage impulse turbine with a diameter of 1.2 m runs at 3000 r.p.m. If the blade speed ratio is 0.42, then the inlet velocity of steam will be

In a De-Laval impulse turbine, the nozzle is kept very close to the blades.

For maximum efficiency of an impulse turbine, the steam should leave the blades at right angles to their motion.

The pressure of steam at throat of a steam nozzle is called critical pressure.

The process of draining steam from the turbine, at certain points during its expansion and using this steam for heating the feed water in feed water heaters and then supplying it to the boiler is known as

In a 50% reaction turbine stage, tangential component of absolute velocity at rotor inlet is 537 m/s and the blade velocity is 454 m/s. The power output in kW of steam will be

In an impulse turbine, steam expands

In a nozzle, the effect of supersaturation is to increase the dryness fraction of steam.

The specific speed of a turbine is the speed of an imaginary turbine, identical with the given turbine, which

The runaway speed of a hydraulic turbine is the speed

The cavitation in a hydraulic machine

The function of guide vanes in a reaction turbine is to

In an outward flow reaction turbine

A hydraulic press is a device used

The undershot water wheels are those in which

The gross or total head of the turbine is the __________ of the water levels at the head race and tail race.

Which of the following pump is suitable for small discharge and high heads?

A turbine is required to develop 1500 kW at 300 r.p.m. under a head of 150 m. Which of the following turbine should be used ?

The specific speed of a centrifugal pump may be defined as the speed of an imaginary pump, identical with the given pump, which will discharge one litre of water, while it is being raised through a head of one metre.

The specific speed (N_s) of a centrifugal pump is given by

Which of the following hydraulic unit is used for transmitting increased or decreased torque to the driven shaft?

The force exerted by a jet of water impinging normally on a plate which due to the impact of jet, moves in the direction of jet with a velocity v is

In a reaction turbine, the water enters the wheel under pressure and flows over the vanes.

Mechanical efficiency of a centrifugal pump is the ratio of

If the ratio of corresponding velocities at corresponding points are equal, then the model and the prototype are said to have dynamic similarity.

The jet ratio is defined as the ratio of the

The flow ratio in case of Francis turbine varies from

Which of the following turbine is preferred for a specific speed of 60 to 300 r.p.m.?

The number of buckets on the periphery of a Pelton wheel is given by

Which of the following statement is wrong ?