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4

Steam turbines are used for

A. Large marine propulsion

B. Electric power generation

C. Direct drive of fans, compressors, pumps

D. All of these

Correct Answer :

D. All of these


Related Questions

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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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The length of Cornish boiler is of the order of

A. 24 m

B. 35 m

C. 57.5 m

D. 79 m

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The height of chimney in a power plant is governed by

A. The draft to be created

B. Limitation of construction facilities

C. Control of pollution

D. Quantity of flue gases to be handled

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4

Which of the following statement is correct for a compound steam engine?

A. The cost of the engine, for the same power and economy, is more than that of a simple steam engine.

B. The forces in the working parts are increased as the forces are distributed over more parts.

C. The ratio of expansion is reduced, thus reducing the length of stroke.

D. The temperature range per cylinder is increased, with corresponding increase in condensation.

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The critical pressure ratio for gases is

A. 0.528

B. 0.546

C. 0.577

D. 0.582

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The equivalent evaporation of a boiler is a measure to compare

A. The given boiler with the model

B. The two different boilers of the same make

C. Two different makes of boilers operating under the same operating conditions

D. Any type of boilers operating under any conditions

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4

A fusible plug is fitted in small boilers in order to

A. Avoid excessive build up of pressure

B. Avoid explosion

C. Extinguish fire if water level in the boiler falls below alarming limit

D. Control steam dome

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During polytropic process

A. Heat transfer takes place across cylinder walls

B. Work is done

C. Steam may be wet, dry or superheated after expansion

D. All of the above

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The power of a boiler may be defined as

A. The ratio of heat actually used in producing the steam to the heat liberated in the furnace

B. The amount of water evaporated or steam produced in kg per kg of fuel burnt

C. The amount of water evaporated from and at 100° C into dry and saturated steam

D. The evaporation of 15.653 kg of water per hour from and at 100° C

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4

In fire 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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Heating wet steam at constant temperature is heating it at constant

A. Volume

B. Pressure

C. Entropy

D. Enthalpy

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The process of draining steam from the turbine, at certain points during its expansion and using this steam for heating the feed water in feed water heaters and then supplying it to the boiler is known as

A. Regenerative heating

B. Reheating of steam

C. Bleeding

D. None of these

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The critical pressure gives the velocity of steam at the throat

A. Equal to the velocity of sound

B. Less than the velocity of sound

C. More than the velocity of sound

D. None of these

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The velocity of flue gases (V) through the chimney under a static draught of (H') metres is given by

A. V = 2g H'

B. V = 2g/H'

C. V = H'/2g

D. V = 2gH'

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4

The critical pressure ratio (p₂/p₁) is given by

A. (p₂/p₁) = [2/(n - 1)] n/(n + 1)

B. (p₂/p₁) = [2/(n + 1)] n/(n-1)

C. (p₂/p₁) = [(n - 1)/2] n + (1/n)

D. (p₂/p₁) = [(n + 1)/2] n - (1/n)

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The basic job of feed water treatment in boilers is to overcome the problem of

A. Corrosion

B. Scale

C. Carryover

D. All of the above

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The balanced draft furnace is one using

A. Induced draft fan and chimney

B. Induced draft fan and forced draft fan

C. Forced draft fan and chimney

D. Any one of the above

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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

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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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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 dry saturated steam at very low pressure, (510 kg/cm²) when throttled to atmosphere will become

A. Wet

B. Superheated

C. Remain dry saturated

D. Dry

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Which of the following statement is correct for steam turbines as compared to reciprocating steam engines?

A. A steam turbine develops higher speeds

B. The efficiency of steam turbine is higher

C. The steam consumption is less

D. All of these

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4

The impulse turbine rotor efficiency will have a maximum value of 0.5 cos 2α, where α is the nozzle exit flow angle, if the

A. Blades are equiangular

B. Blade velocity coefficient is unity

C. Blades are equiangular and frictionless

D. Blade solidity is 0.65

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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 of the following substance will have same percentage in both proximate and ultimate analysis?

A. Ash

B. Volatile matter

C. Moisture

D. Hydrogen

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Steam exhaust from high pressure turbine is reheated in

A. Boiler drums

B. Superheater tubes

C. Economiser

D. A separate coil located in convection path.

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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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The diameter of a cylindrical shell of a Scotch marine boiler varies from

A. 1.5 to 2 m

B. 2.5 to 3.5 m

C. 3.5 to 4.5 m

D. None of these

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The fittings mounted on the boiler for its proper and safe functioning is a

A. Water level indicator

B. Pressure gauge

C. Safety valve

D. All of these

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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