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4

The behaviour of coal in a furnace is determined by

A. The content of sulphur

B. The content of ash and heating value

C. The proximate analysis

D. The exact analysis

Correct Answer :

C. The proximate analysis


Related Questions

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4

In a steam engine, superheated steam from the boiler is fed into the steam chest at a pressure of

A. 10 atmospheres

B. 20 atmospheres

C. 30 atmospheres

D. 40 atmospheres

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4

The draught may be produced by a

A. Mechanical fan

B. Chimney

C. A steam jet

D. All of these

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4

Steam engine operates on

A. Carnot cycle

B. Joule cycle

C. Stirling cycle

D. Brayton cycle

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4

In a boiler, the heat is lost

A. To dry flue gases

B. In moisture present in the fuel

C. To steam formed by combustion of hydrogen per kg of fuel

D. All of the above

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4

Caking coals are those which

A. Form lumps or masses of coke

B. Burn freely

C. Show little or no fusing action

D. Burn completely

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4

In a glass tube type water indicator for a boiler, one end of the tube is connected to water space and the other end is connected to

A. Water space also

B. Chimney

C. Steam space

D. Superheater

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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 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

Secondary air is the air used to

A. Provide air around burners for obtaining optimum combustion

B. Transport and dry the coal

C. Convert CO (formed in lower zone of furnace) into CO₂ at higher zone

D. Air delivered by induced draft fan

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4

In impulse turbines, when friction is neglected, the relative velocity of steam at outlet tip of the blade is __________ the relative velocity of steam at inlet tip of the blade.

A. Equal to

B. Less than

C. Greater than

D. None of these

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4

Which of the following substance will have same percentage in both proximate and ultimate analysis?

A. Ash

B. Volatile matter

C. Moisture

D. Hydrogen

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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

Which of the following is steam dial?

A. Non-coking bituminous coal

B. Brown coal

C. Pulverised coal

D. Coking bituminous coal

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4

Which is not correct statement about pulverised fuel firing?

A. High burning rate is possible

B. Heat release can be easily controlled

C. Fuel burns economically

D. It is the best technique for burning high ash content fuel having low fusion ash

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4

Which of the following statement is correct?

A. A horizontal steam engine requires less floor area than a vertical steam engine

B. The steam pressure in the cylinder is not allowed to fall below the atmospheric pressure

C. The compound steam engines are generally non-condensing steam engines

D. All of the above

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4

Water tube boilers are

A. Internally fired

B. Externally fired

C. Internally as well as externally fired

D. None of these

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4

The value of the reheat factor varies from

A. 1.02 to 1.06

B. 1.08 to 1.10

C. 1.2 to 1.6

D. 1.6 to 2

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4

The ratio of heat actually used in producing the steam to the heat liberated in the furnace, is known as

A. Equivalent evaporation

B. Factor of evaporation

C. Boiler efficiency

D. Power of a boiler

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4

Duplex feed pumps are used in small steam boilers. These operate on the principle of

A. Centrifugal pump

B. Axial flow pump

C. Gear pump

D. Reciprocating pump

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4

The best suited coal for chain or travelling grate stoker boiler is

A. Coking coal

B. Non-coking or free burning coal

C. Pulverised coal

D. High sulphur coal

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4

On Mollier chart, flow through turbine is represented by

A. Horizontal straight line

B. Vertical straight line

C. Straight inclined line

D. Curved line

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4

The draught (in mm of water), for maximum discharge of flue gases through the chimney, is given by (where H = Height of the chimney in metres, and T1 = Absolute temperature of air outside the chimney in K)

A. T1 /88.25H

B. 88.25H/T1

C. T1 /176.5H

D. 176.5H/T1

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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

The fire tubes in, a Coarran and Scottish marine boiler are

A. Horizontal

B. Vertical

C. Inclined

D. Both horizontal and vertical

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4

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

A. Does not change

B. Increases

C. Decreases

D. None of these

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4

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

A. Has no effect on

B. Decreases

C. Increases

D. None of these

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4

The steam enters the nozzle at a

A. High pressure and a low velocity

B. High pressure and a high velocity

C. Low pressure and a low velocity

D. Low pressure and a high velocity

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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

The function of injector used in small capacity boilers is to

A. Create vacuum

B. Inject chemical solution in feed pump

C. Pump water, similar to boiler feed pump

D. Add make up water in the system

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4

The saturation temperature of steam with increase in pressure increases

A. Linearly

B. Rapidly first and then slowly

C. Slowly first and then rapidly

D. Inversely