Which of the following statement is correct?

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Which of the following statement is correct?

A. Lancashire boiler is a fire tube boiler.

B. Fire tube boilers are internally fired.

C. Babcock and Wilcox boiler is a water tube boiler.

D. All of the above

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Heating of dry steam above saturation temperature is known as

A. Enthalpy

B. Superheating

C. Super saturation

D. Latent heat

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The state of vapour under saturation condition is described by

A. Pressure alone

B. Temperature alone

C. Pressure and temperature

D. Pressure and dryness fraction

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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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The ratio of heat utilised to produce steam and the heat liberated in furnace is known as

A. Boiler effectiveness

B. Boiler evaporative capacity

C. Factor of evaporation

D. Boiler efficiency

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The draught produced by a steam jet issuing from a nozzle placed in the chimney is called

A. Induced steam jet draught

B. Chimney draught

C. Forced steam jet draught

D. None of these

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When the circulation of water, in a boiler, is by convection currents which are set up during the heating of water, 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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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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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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Maximum energy loss in a boiler occurs due to

A. Unburnt carbon in ash

B. Incomplete combustion

C. Ash content

D. Flue gases

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Which of the following boiler is best suited to meet the fluctuating demand of steam?

A. Locomotive boiler

B. Lancashire boiler

C. Cornish boiler

D. Babcock and Wilcox boiler

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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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The size of a boiler drum in pulverised fuel fired boiler, as its size and capacity, (steam pressure and flow ratings) increase

A. Increases

B. Decreases

C. Remains unchanged

D. Increases/decreases depending on steam temperature requirements

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The expansion of steam in a nozzle follows

A. Carnot cycle

B. Rankine cycle

C. Joule cycle

D. Stirling cycle

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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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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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The missing quantity per stroke is equal to

A. Cylinder feed indicated mass of steam

B. Cylinder feed + indicated mass of steam

C. Mass of cushion steam + indicated mass of steam

D. Mass of cushion steam + cylinder feed

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Which of the following statement is wrong?

A. The critical pressure gives the velocity of steam at the throat equal to the velocity of sound.

B. The flow in the convergent portion of the nozzle is subsonic.

C. The flow in the divergent portion of the nozzle is supersonic.

D. To increase the velocity of steam above sonic velocity (supersonic) by expanding steam below the critical pressure, the divergent portion for the nozzle is not necessary.

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Superheating of steam is done at

A. Constant volume

B. Constant temperature

C. Constant pressure

D. Constant entropy

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Cochran boiler is a

A. Horizontal fire tube boiler

B. Horizontal water tube boiler

C. Vertical water tube boiler

D. Vertical fire tube boiler

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The efficiency of reaction turbine is maximum when (where α = Angle made by the absolute velocity V at inlet)

A. V_b = 0.5 V cosα

B. V_b = V cos α

C. V_b = 0.5 V² cosα

D. V_b = V² cosα

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The diameter of Cornish boiler varies from

A. 0.5 to 1 m

B. 1 to 2 m

C. 1.25 to 2.5 m

D. 2 to 3 m

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A device used to increase the temperature of saturated steam without raising its pressure, is called

A. Blow off cock

B. Fusible plug

C. Superheater

D. Stop valve

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When the speed of the crankshaft is between 100 r.p.m. and 250 r.p.m., the engine said to be a

A. Slow speed engine

B. Medium speed steam engine

C. High speed steam engine

D. None of these

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The efficiency of a pressure-velocity compounded impulse turbine is __________ as compared to pressure compounded impulse turbine.

A. Same

B. Less

C. More

D. None of these

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

A. Same as

B. 2 times

C. 4 times

D. 8 times

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One kg of steam sample contains 0.8 kg dry steam; Its dryness fraction is

A. 0.2

B. 0.8

C. 1.0

D. 0.6

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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

A. 260 kW

B. 282 kW

C. 296 kW

D. 302 kW

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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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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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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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Accepted Answer

D. All of the above

Which of the following statement is correct?

Correct Answer :

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Related Questions

Heating of dry steam above saturation temperature is known as

The state of vapour under saturation condition is described by

The three Ts for good combustion are

The ratio of heat utilised to produce steam and the heat liberated in furnace is known as

The draught produced by a steam jet issuing from a nozzle placed in the chimney is called

When the circulation of water, in a boiler, is by convection currents which are set up during the heating of water, then the boiler is known as

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

The function of a flywheel is

Maximum energy loss in a boiler occurs due to

Which of the following boiler is best suited to meet the fluctuating demand of steam?

Which is not correct statement about pulverised fuel firing?

The size of a boiler drum in pulverised fuel fired boiler, as its size and capacity, (steam pressure and flow ratings) increase

The expansion of steam in a nozzle follows

In forced recirculation type boiler,

In a single acting steam engine

The missing quantity per stroke is equal to

Which of the following statement is wrong?

Superheating of steam is done at

Cochran boiler is a

The efficiency of reaction turbine is maximum when (where α = Angle made by the absolute velocity V at inlet)

The diameter of Cornish boiler varies from

A device used to increase the temperature of saturated steam without raising its pressure, is called

When the speed of the crankshaft is between 100 r.p.m. and 250 r.p.m., the engine said to be a

The efficiency of a pressure-velocity compounded impulse turbine is __________ as compared to pressure compounded impulse turbine.

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

One kg of steam sample contains 0.8 kg dry steam; Its dryness fraction is

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

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)

The value of the reheat factor varies from

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

Also checkout

Which of the following statement is correct?

Correct Answer :

Show all Steam Boilers, Engines, Nozzles & Turbines MCQ

Related Questions

Heating of dry steam above saturation temperature is known as

The state of vapour under saturation condition is described by

The three Ts for good combustion are

The ratio of heat utilised to produce steam and the heat liberated in furnace is known as

The draught produced by a steam jet issuing from a nozzle placed in the chimney is called

When the circulation of water, in a boiler, is by convection currents which are set up during the heating of water, then the boiler is known as

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

The function of a flywheel is

Maximum energy loss in a boiler occurs due to

Which of the following boiler is best suited to meet the fluctuating demand of steam?

Which is not correct statement about pulverised fuel firing?

The size of a boiler drum in pulverised fuel fired boiler, as its size and capacity, (steam pressure and flow ratings) increase

The expansion of steam in a nozzle follows

In forced recirculation type boiler,

In a single acting steam engine

The missing quantity per stroke is equal to

Which of the following statement is wrong?

Superheating of steam is done at

Cochran boiler is a

The efficiency of reaction turbine is maximum when (where α = Angle made by the absolute velocity V at inlet)

The diameter of Cornish boiler varies from

A device used to increase the temperature of saturated steam without raising its pressure, is called

When the speed of the crankshaft is between 100 r.p.m. and 250 r.p.m., the engine said to be a

The efficiency of a pressure-velocity compounded impulse turbine is __________ as compared to pressure compounded impulse turbine.

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

One kg of steam sample contains 0.8 kg dry steam; Its dryness fraction is

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

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)

The value of the reheat factor varies from

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

Also checkout

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)