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4

The pressure velocity compounded impulse turbine allows a bigger pressure drop and hence __________ numbers of stages are required.

A. More

B. Less

C. Equal

D. None of these

Correct Answer :

B. Less


Related Questions

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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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4

Pick up the wrong statement about water tube boiler in comparison to fire tube boilers

A. Former occupies less space for same power

B. Rate of steam flow is more in former case

C. Former is used for high installed capacity

D. Chances of explosion are less in former case.

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4

The performance of a boiler is measured by the

A. Amount of water evaporated per hour

B. Steam produced in kg/h

C. Steam produced in kg/kg of fuel burnt

D. All of these

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4

O₂ content in atmospheric air on volume basis is

A. 21 %

B. 23 %

C. 30 %

D. 40 %

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4

The actual power supplied by the engine crankshaft is called

A. Indicated power

B. Brake power

C. Frictional power

D. None of these

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4

Water and sediment in fuel oil can be removed by

A. Heating the oil in the settling tanks

B. Cooling the oil in the settling tanks

C. Burning the oil

D. Suspension

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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

The numbers of fire tubes in a Cochran boiler are

A. 75

B. 115

C. 165

D. 225

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4

The fire tubes in a Scotch marine boiler are

A. Horizontal

B. Vertical

C. Inclined

D. None of these

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4

The turbine blades are

A. Straight

B. Circular

C. Curved

D. None of these

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4

Green coal, in order to be burnt, must be

A. Heated sufficiently

B. Burnt in excess air

C. Heated to its ignition point

D. Burnt as powder

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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

When the total heat of steam is h kJ/kg and the sensible heat of feed water is hf1 kJ/kg, then the factor of evaporation is given by

A. (h - hf1)/2257

B. (h + hf1)/2257

C. (h × hf1)/2257

D. None of these

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4

The efficiency of the plant __________ with the mechanical draught.

A. Increases

B. Decreases

C. Remains constant

D. None of these

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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

The effect of friction in the nozzle __________ dryness fraction of steam.

A. Has no effect on

B. Decreases

C. Increases

D. None of these

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4

When the speed of the engine is controlled by means of a valve in a steam pipe, which regulates the pressure of steam entering the engine, then the governing is known as

A. Throttle governing

B. Cut-off governing

C. By-pass governing

D. None of these

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4

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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4

For the same length of stroke and speed of crankshaft, the piston speed for a double acting steam engine is _________ the piston speed of single acting steam engine.

A. Equal to

B. Twice

C. Three times

D. Four times

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4

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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4

Which device is used in thermal power plants to reduce level of pollution?

A. Induced draft fan

B. Smoke meter

C. Chimney

D. Precipitator

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4

The expansion of steam, as it flows over the blades in reaction turbine, represents

A. Isothermal process

B. Isentropic process

C. Throttling process

D. Free expansion process

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4

A _________ in a boiler is used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit.

A. Blow off cock

B. Fusible plug

C. Stop valve

D. Safety valve

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4

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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4

The change in internal energy in steam engines equals to

A. Work done during the Rankine cycle

B. Work done during compression

C. Work done during adiabatic expansion

D. Change in enthalpy

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4

The specific volume of steam with increase in pressure decreases

A. Linearly

B. Slowly first and then rapidly

C. Rapidly first and then slowly

D. Inversely

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4

Primary air is the air used to

A. Provide air around burners for obtaining optimum combustion

B. Transport and dry the coal

C. Convert CO (formed in lower zone of furnace) into CO₂ at higher zone

D. Air delivered by forced draft fan

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4

The amount of water evaporated in kg per kg of fuel burnt is called

A. Evaporative capacity of a boiler

B. Equivalent evaporation from and at 100° C

C. Boiler efficiency

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

The pressure of reheat steam after passing through reheater compared to inlet condition is

A. More

B. Less

C. Equal

D. May be more or less depending on capacity of reheater