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4

Maximum energy loss in a boiler occurs due to

A. Unburnt carbon in ash

B. Incomplete combustion

C. Ash content

D. Flue gases

Correct Answer :

D. Flue gases


Related Questions

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4

The capacity of induced draft fan compared to forced draft fan in a boiler is

A. Same

B. More

C. Less

D. Less or more depending on size of boiler

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4

Which of the following is correct? (Where pa = Actual mean effective pressure, pm = Theoretical mean effective pressure, and K = Diagram factor)

A. pa = pm/K

B. pa = pm × K

C. pa = K/pm

D. pa = pm + K

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4

In a nozzle, the effect of super-saturation is to

A. Decrease dryness fraction of steam

B. Decrease specific volume of steam

C. Increase the entropy

D. Increase the heat drop

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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

Sulphur content of fuels is very important to the plant operators because it

A. Has high heating value

B. Retards electric precipitation

C. Promotes complete combustion

D. Has highly corrosive effect

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4

The number of flue tubes in Lancashire boiler is

A. Zero

B. One

C. Two

D. Four

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4

Which is not correct statement about the function of furnace?

A. To provide proper conditions for continuous complete combustion

B. Mix fuel with air and ignite

C. Separate ash from coal

D. Maintain heat supply to prepare and ignite the incoming fuel

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4

With increase in load, radiant superheater has

A. Drooping characteristic

B. Linear characteristic

C. Rising characteristic

D. Flat characteristic

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4

The effect of super-saturation is that the

A. Mass of the steam discharged increases

B. Entropy and specific volume of the steam increases

C. Exit velocity of steam reduces

D. All of these

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4

The ratio of the temperature rise of cooling water to the vacuum temperature minus inlet cooling water temperature is called

A. Condenser efficiency

B. Vacuum efficiency

C. Nozzle efficiency

D. Boiler efficiency

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4

The water tubes in a Babcock and Wilcox boiler are

A. Horizontal

B. Vertical

C. Inclined

D. Horizontal and inclined

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4

Carbonisation of coal is the process of

A. Pulverising coal in inert atmosphere

B. Heating wood in a limited supply of air at temperatures below 300°C

C. Strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel

D. Binding the pulverised coal into briquettes

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4

A steam nozzle converts

A. Heat energy of steam into kinetic energy

B. Kinetic energy into heat energy of steam

C. Heat energy of steam into potential energy

D. Potential energy into heat energy of steam

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4

The latent heat of steam with increase of pressure

A. Remain same

B. Increases

C. Decreases

D. Behaves unpredictably

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4

In turbines, the fluid undergoes a continuous steady flow process and the speed of flow is

A. Low

B. Very low

C. High

D. Very high

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4

In a single acting steam engine

A. The steam is admitted on one side of the piston and one working stroke is produced during each revolution of the crankshaft

B. The steam is admitted, in turn, on both sides of the piston and one working stroke is produced during each revolution of the crankshaft

C. The steam is admitted on one side of the piston and two working strokes are produced during each revolution of the crankshaft

D. The steam is admitted, in turn, on both sides of the piston and two working strokes are produced during each revolution of the crankshaft

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4

The pressure of steam in the engine cylinder at the beginning of the stroke is ________ the boiler pressure.

A. Equal to

B. Less than

C. Higher than

D. None of these

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4

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

A. Wet steam

B. Dry saturated steam

C. Superheated steam

D. None of these

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4

The purpose of governing in steam turbines is to

A. Maintain the speed of the turbine

B. Reduce the effective heat drop

C. Reheat the steam and improve its quality

D. Completely balance against end thrust

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4

A double acting steam engine with a cylinder diameter of 190 mm and a stroke of 300 mm has a cut-off of 0.35. The expansion ratio for this engine is nearly

A. 1.05

B. 2.86

C. 6.65

D. 10.05

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4

The ratio of the useful heat drop to the isentropic heat drop is called

A. Condenser efficiency

B. Nozzle efficiency

C. Boiler efficiency

D. Vacuum efficiency

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4

The crown of the fire box is made hemispherical in order to

A. Give maximum space

B. Give maximum strength

C. Withstand pressure inside boiler

D. Resist intense heat in fire box

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4

In locomotive boiler, maximum steam pressure is limited to

A. 1 kg/cm²

B. 5 kg/cm²

C. 10 kg/cm²

D. 18 kg/cm²

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4

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

A. Velocity increases

B. Velocity decreases

C. Velocity remains constant

D. Pressure remains constant

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4

When the circulation of water, in a boiler, is by a centrifugal pump, then the boiler is known as

A. Internally fired boiler

B. Externally fired boiler

C. Natural circulation boiler

D. Forced circulation boiler

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4

The relative heat absorption for successively added equal areas of boiler convection heating surfaces

A. Increases

B. Decreases

C. Remain unaffected

D. First increases and then decreases

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4

By compounding the expansion of steam in two or more cylinders, the ratio of expansion

A. Does not change

B. Increases

C. Decreases

D. None of these

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4

The function of a crosshead is to guide motion of the _________ and to prevent it from bending.

A. Piston rod

B. Connecting rod

C. Eccentric rod

D. Valve rod

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4

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

A. Bleeding

B. Reheating

C. Governing

D. None of these

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4

In water wall furnace, the heat is transferred to the water walls by

A. Convection

B. Radiation

C. Conduction

D. Radiation and conduction