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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

Correct Answer :

B. Rapidly first and then slowly


Related Questions

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4

The pressure of reheat steam after passing through reheater compared to inlet condition is

A. More

B. Less

C. Equal

D. May be more or less depending on capacity of reheater

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4

A condenser where circulating water flows through tubes which are surrounded by steam, in known as

A. Surface condenser

B. Jet condenser

C. Barometric condenser

D. Evaporative condenser

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4

There is always some steam left in the clearance space from the previous stroke. This steam left in the clearance space is called

A. Wet steam

B. Saturated steam

C. Superheated steam

D. Cushion steam

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4

The average operating pressure of Benson boiler is

A. 100 bar

B. 150 bar

C. 200 bar

D. 250 bar

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4

Spontaneous combustion is a phenomenon in which

A. All the fuel burns instantaneously producing high energy release

B. Fuel burns with less air

C. Coal bursts into flame without any external ignition source but by itself due to gradual increase in temperature as a result of heat released by combination of oxygen with coal

D. Explosion in furnace

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4

The three Ts for good combustion are

A. Temperature, time, and turbulence

B. Total air, true fuel, and turbulence

C. Thorough mixing, total air and temperature

D. Total air, time, and temperature

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4

The maximum discharge through a chimney occurs when the height of chimney is

A. Infinitely long

B. Around 200 meters

C. Equal to the height of the hot gas column producing draught

D. Outside temperature is very low

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4

Which of the following statement is correct?

A. The expansion of steam in a nozzle follows Rankine cycle.

B. The friction in the nozzle increases the dryness fraction of steam.

C. The pressure of steam at throat is called critical pressure.

D. All of the above

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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

The diameter of internal flue tubes of a Lancashire boiler is about _________ that of its shell.

A. One-fourth

B. One-third

C. Two-fifth

D. One-half

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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

In an impulse turbine, steam expands

A. Wholly in blades

B. Wholly in nozzle

C. Partly in the nozzle and partly in blades

D. None of these

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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

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

The fusible plug in small boilers is located

A. In the drum

B. In the fire tubes

C. Above steam dome

D. Over the combustion chamber

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4

Gusset stays in a boiler are provided to

A. Prevent the bulging of flat surfaces

B. Avoid explosion in furnace

C. Prevent leakage of hot flue gases

D. Support furnace freely from top

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4

The stage efficiency (ηS) is given by (where ηB = Blading efficiency, and ηN = Nozzle efficiency)

A. ηS = ηB × ηN

B. ηS = ηB / ηN

C. ηS = ηN / ηB

D. None of these

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4

The high pressure and low pressure cylinders in a receiver type compound engine are regarded as having cranks

A. 180° to each other

B. 90° to each other

C. 0° to each other

D. None of these

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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

Vacuum for reciprocating steam engines compared to steam turbines is

A. More

B. Equal

C. Less

D. Could be more or less depending on the size of plant

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4

In a reaction turbine when the degree of reaction is zero, then there is

A. No heat drop in moving blades

B. No heat drop in fixed blades

C. Maximum heat drop in moving blades

D. Maximum heat drop in fixed blades

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4

Tertiary air is the air used to

A. Provide air around burners for obtaining optimum combustion

B. Transport and dry the coal

C. Cool the scanners

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

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4

The chimney draught varies with

A. Climatic conditions

B. Temperature of furnace gases

C. Height of chimney

D. All of these

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4

The economiser is used in boilers to

A. Increase thermal efficiency of boiler

B. Economise on fuel

C. Extract heat from the exhaust flue gases

D. Increase flue gas temperature

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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

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

The diameter of Cornish boiler is of the order of

A. 12 m

B. 1.52.5 m

C. 23 m

D. 2.53.5 m

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4

Which of the following statement indicates the difference between Cornish boiler and Lancashire boiler?

A. Cornish boiler is a water tube boiler whereas Lancashire boiler is a fire tube boiler

B. Cornish boiler is a fire tube boiler whereas Lancashire boiler is a water tube boiler

C. Cornish boiler has one flue tube whereas Lancashire boiler has two flue tubes

D. Cornish boiler has two flue tubes whereas Lancashire boiler has one flue tube

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4

The number of water level indicators in a boiler are generally _________ in number.

A. One

B. Two

C. Three

D. Four

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4

Fire tube boilers are limited to a maximum working pressure of

A. 0.17 MN/m²

B. 1.7 MN/m²

C. 17 MN/m²

D. 170 MN/m²