Which type of boiler can meet rapid changes of load?

Question

Which type of boiler can meet rapid changes of load?

A. Vertical fire tube type

B. Horizontal fire tube type

C. Horizontal water tube type

D. Forced circulation type

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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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The cylinder condensation or missing quantity may be reduced by

A. The efficient steam jacketing of the cylinder walls

B. Superheating the steam supplied to the engine cylinder

C. Keeping the expansion ratio small in each cylinder

D. All of the above

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De-Laval turbines are mostly used

A. Where low speeds are required

B. For small power purposes and low speeds

C. For large power purposes

D. For small power purposes and high speeds

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

A. Convection

B. Radiation

C. Conduction

D. Radiation and conduction

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Latent heat of dry steam at atmospheric pressure is equal to

A. 539 kcal/ kg

B. 539 BTU/ lb

C. 427 kcal/ kg

D. 100 kcal/ kg

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At critical point, i.e. p = 225.65 kg/cm², the latent enthalpy of vaporisation is

A. Maximum

B. Minimum

C. Zero

D. Depends on temperature also

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The draught produced by a steam jet issuing from a nozzle placed in the ash-pit under the fire grate of the furnace is called

A. Induced steam jet draught

B. Chimney draught

C. Forced steam jet draught

D. None of these

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The high steam and low water safety valve is not used in

A. Cochran boiler

B. Cornish boiler

C. Lancashire boiler

D. Locomotive boiler

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The rate of discharge through the nozzle __________ when the exit pressure is gradually reduced.

A. Remains same

B. Decreases

C. Increases

D. None of these

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The difference of supersaturated temperature and saturation temperature at that pressure is called

A. Degree of super-saturation

B. Degree of superheat

C. Degree of under-cooling

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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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 diameters of fire tubes and superheater tubes in locomotive boiler are

A. 47.5 mm, 130 mm

B. 32.5 mm, 180 mm

C. 65.5 mm, 210 mm

D. 24.5 mm, 65 mm

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Pick up the correct statement as regards Cornish boiler and Lancashire boiler

A. Cornish is fire tube and Lancashire is water tube

B. Cornish is water tube and Lancashire is fire tube

C. Cornish has two fire tubes and Lancashire has one

D. Lancashire has two fire tubes and Cornish has one

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A compound steam engine in which piston rods of high pressure and low pressure cylinders are attached to two different cranks set at 90° to each other, is called

A. Receiver type compound engine

B. Tandem type compound engine

C. Woolf type compound engine

D. Both (A) and (B)

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The turbine blades are

A. Straight

B. Circular

C. Curved

D. None of these

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The draught may be produced by a

A. Mechanical fan

B. Chimney

C. A steam jet

D. All of these

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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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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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Equivalent evaporation of water is the evaporation for a feed water supply at 100°C

A. And its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm²

B. And its corresponding conversion into dry steam at desired boiler pressure

C. Conversion into steam at atmospheric condition

D. Conversion into steam at the same pressure at which feed water is supplied

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The friction in the nozzle __________ exit velocity of steam.

A. Has no effect on

B. Decreases

C. Increases

D. None of these

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The bituminous coal is no caking if its carbon content is

A. 78-81 %

B. 81-85 %

C. 85-90 %

D. 90-95 %

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The water tubes in a simple vertical boiler are

A. Horizontal

B. Vertical

C. Inclined

D. None of these

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Efficiency of Rankine cycle can be increased by

A. Decreasing initial steam pressure and temperature

B. Increasing exhaust pressure

C. Decreasing exhausts pressure

D. Increasing the expansion ratio

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The average operating pressure of Benson boiler is

A. 100 bar

B. 150 bar

C. 200 bar

D. 250 bar

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The nozzle 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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In a De-Laval nozzle expanding superheated steam from 10 bar to 0.1 bar, the pressure at the minimum cross-section (i. e. pressure at throat, p₂) will be

A. 3.3 bar

B. 5.46 bar

C. 8.2 bar

D. 9.9 bar

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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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It is required to produce large amount of steam at low pressure. Which boiler should be used?

A. Pulverised fuel fired boiler

B. Cochran boiler

C. Lancashire boiler

D. Babcock and Wilcox boiler

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The maximum efficiency of a De-Laval turbine is (where α = Nozzle angle)

A. sin²α

B. cos²α

C. tan²α

D. cot²α

Discuss this answer

Accepted Answer

D. Forced circulation type

Which type of boiler can meet rapid changes of load?

Correct Answer :

Show all Steam Boilers, Engines, Nozzles & Turbines MCQ

Related Questions

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

The cylinder condensation or missing quantity may be reduced by

De-Laval turbines are mostly used

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

Latent heat of dry steam at atmospheric pressure is equal to

At critical point, i.e. p = 225.65 kg/cm², the latent enthalpy of vaporisation is

The draught produced by a steam jet issuing from a nozzle placed in the ash-pit under the fire grate of the furnace is called

The high steam and low water safety valve is not used in

The rate of discharge through the nozzle __________ when the exit pressure is gradually reduced.

The difference of supersaturated temperature and saturation temperature at that pressure is called

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

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

The diameters of fire tubes and superheater tubes in locomotive boiler are

Pick up the correct statement as regards Cornish boiler and Lancashire boiler

A compound steam engine in which piston rods of high pressure and low pressure cylinders are attached to two different cranks set at 90° to each other, is called

The turbine blades are

The draught may be produced by a

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

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)

Equivalent evaporation of water is the evaporation for a feed water supply at 100°C

The friction in the nozzle __________ exit velocity of steam.

The bituminous coal is no caking if its carbon content is

The water tubes in a simple vertical boiler are

Efficiency of Rankine cycle can be increased by

The average operating pressure of Benson boiler is

The nozzle efficiency is the ratio of

In a De-Laval nozzle expanding superheated steam from 10 bar to 0.1 bar, the pressure at the minimum cross-section (i. e. pressure at throat, p₂) will be

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

It is required to produce large amount of steam at low pressure. Which boiler should be used?

The maximum efficiency of a De-Laval turbine is (where α = Nozzle angle)

Also checkout

Which type of boiler can meet rapid changes of load?

Correct Answer :

Show all Steam Boilers, Engines, Nozzles & Turbines MCQ

Related Questions

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

The cylinder condensation or missing quantity may be reduced by

De-Laval turbines are mostly used

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

Latent heat of dry steam at atmospheric pressure is equal to

At critical point, i.e. p = 225.65 kg/cm², the latent enthalpy of vaporisation is

The draught produced by a steam jet issuing from a nozzle placed in the ash-pit under the fire grate of the furnace is called

The high steam and low water safety valve is not used in

The rate of discharge through the nozzle __________ when the exit pressure is gradually reduced.

The difference of supersaturated temperature and saturation temperature at that pressure is called

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

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

The diameters of fire tubes and superheater tubes in locomotive boiler are

Pick up the correct statement as regards Cornish boiler and Lancashire boiler

A compound steam engine in which piston rods of high pressure and low pressure cylinders are attached to two different cranks set at 90° to each other, is called

The turbine blades are

The draught may be produced by a

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

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)

Equivalent evaporation of water is the evaporation for a feed water supply at 100°C

The friction in the nozzle __________ exit velocity of steam.

The bituminous coal is no caking if its carbon content is

The water tubes in a simple vertical boiler are

Efficiency of Rankine cycle can be increased by

The average operating pressure of Benson boiler is

The nozzle efficiency is the ratio of

In a De-Laval nozzle expanding superheated steam from 10 bar to 0.1 bar, the pressure at the minimum cross-section (i. e. pressure at throat, p₂) will be

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

It is required to produce large amount of steam at low pressure. Which boiler should be used?

The maximum efficiency of a De-Laval turbine is (where α = Nozzle angle)

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)