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4

Thermal efficiency of a thermal power plant is of the order of

A. 15 %

B. 20 %

C. 30 %

D. 45 %

Correct Answer :

C. 30 %


Related Questions

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The pressure of steam __________ while flowing through a nozzle.

A. Increases

B. Decreases

C. Remains constant

D. None of these

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4

An economiser in a boiler

A. Increases steam pressure

B. Increases steam flow

C. Decreases fuel consumption

D. Decreases steam pressure

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4

The critical pressure ratio for initially wet steam is

A. 0.546

B. 0.577

C. 0.582

D. 0.601

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4

When the inlet pressure of steam is equal to the exit pressure, then

A. There is a pressure drop in the nozzle

B. Fluid flows through the nozzle

C. Pressure drops and fluid flows through the nozzle

D. There is no pressure drop and fluid does not flow through the nozzle

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4

In designing air preheaters, the important design consideration is that

A. Approach temperature should be as low as possible

B. Handling and maintenance should be easier

C. Heat transfer area should be optimum

D. Stack gases should not be cooled to the dew point

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4

The function of a flywheel is

A. To convert reciprocating motion of the piston into rotary motion

B. To convert rotary motion of the crankshaft into to and fro motion of the valve rod

C. To prevent fluctuation of speed

D. To keep the engine speed uniform at all load conditions

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4

Boiler H.P. is defined as the

A. Steam evaporation rate per kg of fuel fired

B. Work done in evaporating 1 kg of steam per hour from and at 100°C into dry saturated steam

C. The evaporation of 15.65 kg of water per hour from and at 100°C into dry saturated steam

D. Work done by 1 kg of steam at saturation condition

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4

Bomb calorimeter is used to determine

A. Higher calorific value at constant volume

B. Lower calorific value at constant volume

C. Higher calorific value at constant pressure

D. Lower calorific value at constant pressure

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4

A device used to heat feed water by utilising the heat in me exhaust flue gases before leaving through the chimney, is known as

A. Economiser

B. Fusible plug

C. Superheater

D. Stop valve

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4

The diameter of fire tubes in Cochran boiler is of the order of

A. 2 cm

B. 6 cm

C. 8 cm

D. 12 cm

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4

The length of shell of a Locomotive boiler is

A. 1 m

B. 2 m

C. 3 m

D. 4 m

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4

The change in internal energy in steam engines equals to

A. Work done during the Rankine cycle

B. Work done during compression

C. Work done during adiabatic expansion

D. Change in enthalpy

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4

In water tube boilers

A. Water passes through the tubes which are surrounded by flames and hot gases

B. The flames and hot gases pass through the tubes which are surrounded by water

C. Forced circulation takes place

D. None of these

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4

The flow of steam is supersonic

A. At the entrance to the nozzle

B. At the throat of the nozzle

C. In the convergent portion of the nozzle

D. In the divergent portion of the nozzle

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4

The diagram factor is the ratio of the

A. Area of the actual indicator diagram to the area of theoretical indicator diagram

B. Actual workdone per stroke to the theoretical workdone per stroke

C. Actual mean effective pressure to the theoretical mean effective pressure

D. Any one of the above

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4

The diagram efficiency is the ratio of

A. Workdone on the blades to the energy supplied to the blades

B. Workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam

C. Energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam

D. None of the above

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4

The clearance in the engine cylinder

A. Increases the mean effective pressure

B. Increases the workdone

C. Decreases the efficiency of the engine

D. All of these

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4

Which of the following boilers is best suited to meet fluctuating demands?

A. Babcock and Wilcox

B. Locomotive

C. Lancashire

D. Cochran

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4

In a steam condenser, the partial pressure of steam and air are 0.06 bar and 0.007 bar respectively. The condenser pressure is

A. 0.007 bar

B. 0.053 bar

C. 0.06 bar

D. 0.067 bar

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4

Lancashire boiler has __________ internal flue tubes.

A. One

B. Two

C. Three

D. Four

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4

The numbers of fire tubes in a Cochran boiler are

A. 75

B. 115

C. 165

D. 225

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4

The critical pressure gives the velocity of steam at the throat

A. Equal to the velocity of sound

B. Less than the velocity of sound

C. More than the velocity of sound

D. None of these

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4

Heating wet steam at constant temperature is heating it at constant

A. Volume

B. Pressure

C. Entropy

D. Enthalpy

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4

The biggest size of thermal power unit operating in India is

A. 30 MW

B. 60 MW

C. 100 MW

D. 500 MW

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4

In forced recirculation type boiler,

A. Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum

B. Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam

C. Feed pump is employed to supplement natural circulation in water wall type furnace

D. Water is converted into steam in one pass without any recirculation

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4

Heating of dry steam above saturation temperature is known as

A. Enthalpy

B. Superheating

C. Super saturation

D. Latent heat

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4

The shell diameter of a Locomotive boiler is

A. 1 m

B. 1.5 m

C. 2 m

D. 2.5 m

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4

A closed vessel made of steel and used for the generation of steam is called a

A. Steam boiler

B. Steam turbine

C. Steam condenser

D. Steam injector

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4

Hard coke is produced by carburisation of coal at

A. Atmospheric temperature

B. 500-600°C

C. 700-850°C

D. 950-1100°C

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Lancashire boiler is a

A. Stationary fire tube boiler

B. Stationary water tube boiler

C. Water tube boiler with natural/forced circulation

D. Mobile fire tube boiler