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4

Heating wet steam at constant temperature is heating it at constant

A. Volume

B. Pressure

C. Entropy

D. Enthalpy

Correct Answer :

B. Pressure


Related Questions

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4

Which of the following boilers is best suited to meet fluctuating demands?

A. Babcock and Wilcox

B. Locomotive

C. Lancashire

D. Cochran

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4

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

A. sin²α

B. cos²α

C. tan²α

D. cot²α

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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

When steam after doing work in the cylinder passes into a condenser, the engine is said to be a

A. Slow speed engine

B. Vertical steam engine

C. Condensing steam engine

D. Non-condensing steam engine

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4

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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4

The reheat factor depends upon

A. Initial pressure and superheat

B. Exit pressure

C. Turbine stage efficiency

D. All of these

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4

Lancashire boiler is of

A. Stationary < fire tube type

B. Horizontal type

C. Natural circulation type

D. All of the above

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4

When the nozzle operates with the maximum mass flow, the nozzle is said to be

A. Choked

B. Under-damping

C. Over-damping

D. None of these

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4

Expansion ratio is the ratio of

A. Swept volume to the volume at cut-off

B. Clearance volume to the swept volume

C. Volume at cut-off to the swept volume

D. Swept volume to the clearance volume

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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

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

Alkaline pyrogallate is used in Orsat's apparatus for absorption of

A. CO₂

B. CO

C. O₂

D. N₂

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4

Fusible plug for boilers is made of fusible metal containing tin, lead, and

A. Bismuth

B. Copper

C. Aluminium

D. Nickel

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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 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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4

The critical pressure ratio for initially dry saturated steam is

A. 0.546

B. 0.577

C. 0.582

D. 0.601

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4

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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4

The maximum discharge of steam through a convergent-divergent nozzle depends upon

A. Area of nozzle at throat

B. Initial pressure and volume of steam

C. Final pressure of steam leaving the nozzle

D. Both (A) and (B)

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4

The maximum steam pressure in a Locomotive boiler is limited to

A. 0.18 MN/m²

B. 1.8 MN/m²

C. 18 MN/m²

D. 180 MN/m²

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4

An economiser is installed in a boiler primarily to

A. Superheat the steam

B. Reduce fuel consumption

C. Increase steam pressure

D. All of these

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4

The high pressure boiler is one, which produces steam at a pressure more than

A. Atmospheric pressure

B. 5 kg/cm²

C. 10 kg/cm²

D. 7580 kg/cm²

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4

In a reaction turbine, when steam flows through the moving blades,

A. Pressure increases while velocity decreases

B. Pressure decreases while velocity increases

C. Pressure and velocity both decreases

D. Pressure and velocity both increases

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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

The ratio of the workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam is called

A. Blading efficiency

B. Nozzle efficiency

C. Stage efficiency

D. Mechanical efficiency

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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

With increase in load, radiant superheater has

A. Drooping characteristic

B. Linear characteristic

C. Rising characteristic

D. Flat characteristic

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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

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

In case of non-condensing steam engines, the pressure of steam in the cylinder during exhaust stroke is _________ the condenser pressure.

A. Equal to

B. Lower than

C. Higher 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