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4

The length of Cornish boiler is of the order of

A. 24 m

B. 35 m

C. 57.5 m

D. 79 m

Correct Answer :

C. 57.5 m


Related Questions

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4

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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4

Feed water conditioning in thermal power plants in done to

A. Reduce hardness and for removal of solids

B. Increase efficiency of thermal power plant

C. Increase heat transfer rate

D. Increase steam parameters

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4

The coal requirement per kW hour generation in the thermal power plant is of the order of

A. 0.1 to 0.2 kg

B. 0.2 to 0.4 kg

C. 0.6 to 0.8 kg

D. 1.0 to 1.5 kg

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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

Which is not correct statement about effect of sulphur in fuel?

A. It has heating value

B. It helps in electrostatic precipitation of ash in flue gases

C. It leads to corrosion of air heaters, ducting, etc. if flue gas exit temperature is low

D. It erodes furnace walls

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4

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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4

The ratio of brake power to the indicated power is known as

A. Mechanical efficiency

B. Overall efficiency

C. Indicated thermal efficiency

D. Brake thermal efficiency

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4

Calorific value of coal is of the order of

A. 200-400 kcal/ kg

B. 800-1200 kcal/ kg

C. 2000-4000 kcal/ kg

D. 5000-8000 kcal/ kg

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4

Which of the following coals has the highest calorific value?

A. Anthracite coal

B. Bituminous coal

C. Lignite

D. Peat

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4

Superheating of steam is done at

A. Constant volume

B. Constant temperature

C. Constant pressure

D. Constant entropy

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4

While steam expands in turbines, theoretically the entropy

A. Remains constant

B. Increases

C. Decreases

D. Behaves unpredictably

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4

Lancashire boiler has __________ internal flue tubes.

A. One

B. Two

C. Three

D. Four

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4

Which of the following are boiler accessories?

A. Economiser

B. Superheater

C. Both (A) and (B)

D. None of these

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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

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

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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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

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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4

At very low temperature, the melting and boiling temperatures become equal. This temperature is

A. 373°K

B. 273.16°K

C. 303°K

D. 0°K

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4

In locomotives, the draught is produced by

A. Chimney

B. Induced draft fan

C. Both combined (A) and (B)

D. Steam jet draught

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4

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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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

Pick up wrong statement about desired properties of a good fuel

A. High calorific value

B. Produce minimum smoke and gases

C. Ease in storing

D. High ignition point

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4

Heating of dry steam above saturation temperature is known as

A. Enthalpy

B. Superheating

C. Super saturation

D. Latent heat

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4

A steam turbine, in which a part of the steam after partial expansion, is used for process heating and the remaining steam is further expanded for power generation, is known as

A. Back pressure turbine

B. Pass out turbine

C. Low pressure turbine

D. Impulse turbine

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4

In regenerative air preheaters, the heat is transferred

A. From a metal wall from one medium to another

B. From heating an intermediate material and then heating the air from this material

C. By direct mixing

D. Heat is transferred by bleeding some gas from furnace

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4

Evaporative capacity of boiler is expressed as

A. kg of steam produced

B. Steam pressure produced

C. kg of fuel fired

D. kg of steam produced per kg of fuel fifed

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4

Thermal efficiency of well maintained boiler will be of the order

A. 40 %

B. 50 %

C. 75 %

D. 90 %

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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

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