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4

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

Correct Answer :

D. All of the above


Related Questions

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4

Clearance ratio is the ratio of

A. Clearance volume to the swept volume

B. Clearance volume to the volume at cut-off

C. Volume at cut-off to the swept volume

D. Swept volume to the clearance volume

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4

The expansion of steam in a nozzle follows

A. Carnot cycle

B. Rankine cycle

C. Joule cycle

D. Stirling cycle

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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

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

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4

The mechanical draught _________ with the amount of smoke.

A. Increases

B. Decreases

C. Does not effect

D. None of these

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4

In order to compare the capacity of boilers, the feed water temperature and working pressure are taken as

A. 50°C and normal atmospheric pressure

B. 50°C and 1.1 bar pressure

C. 100°C and normal atmospheric pressure

D. 100°C and 1.1 bar pressure

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4

If partial pressure of air and steam be pa and ps respectively in a condenser, then according to Dalton's law, the pressure in condenser is equal to

A. ps - pa

B. pa - ps

C. pa + ps

D. None of these

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4

A vessel into which the steam is exhausted and condensed after doing work in an engine cylinder or turbine is known as

A. Steam condenser

B. Steam boiler

C. Steam preheater

D. Economiser

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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

In recuperative 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 gases from furnace

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4

In a uniflow engine

A. Steam enters and exhausts through the same port

B. Steam enters at one end and exhausts at the centre

C. Steam enters at the centre and exhausts at the other end

D. None of the above

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4

The reheat factor is the ratio of the

A. Cumulative heat drop to the isentropic heat drop

B. Isentropic heat drop to the heat supplied

C. Total useful heat drop to the total isentropic heat drop

D. None of the above

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4

The cylinder dimensions of a compound engine may be designed on the basis of

A. Equal power developed in each cylinder for uniform turning moment

B. Equal initial piston loads on all pistons for obtaining same size of piston rod, connecting rod etc. for all cylinders

C. Equal temperature drop in each cylinder for economy of steam

D. All of the above

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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 tubes for natural circulation boiler as compared to controlled circulation boilers is

A. More

B. Less

C. Same

D. Could be more or less depending on other factors

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4

The critical pressure ratio for gases is

A. 0.528

B. 0.546

C. 0.577

D. 0.582

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4

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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4

In a compound steam engine, the first stage of expansion is carried out in a high pressure cylinder whereas the last expansion is completed in low pressure cylinder. The diameter of high pressure cylinder is _________ the low pressure cylinder.

A. Equal to

B. Less than

C. More than

D. None 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 maximum efficiency of a reaction turbine is

A. 2 sin²α/(1 + sin²α)

B. 2 cos²α/(1 + cos²α)

C. (1 + sin²α)/2 sin²α

D. (1 + cos²α)/2 cos²α

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4

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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4

Tertiary air is the air used to

A. Provide air around burners for obtaining optimum combustion

B. Transport and dry the coal

C. Cool the scanners

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

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4

In an impulse turbine, steam expands

A. Wholly in blades

B. Wholly in nozzle

C. Partly in the nozzle and partly in blades

D. None of these

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4

The forced circulation of water does not take place in

A. LaMont boiler

B. Lancashire boiler

C. Velox boiler

D. Benson boiler

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4

The blade friction in the impulse turbine reduces the velocity of steam by __________ while it passes over the blades.

A. 10 to 15 %

B. 15 to 20 %

C. 20 to 30 %

D. 30 to 40 %

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4

The feed check valve is used in order to

A. Regulate flow of boiler water

B. Check level of water in boiler drum

C. Recirculate unwanted feed water

D. Allow high pressure feed water to flow to drum and not allow reverse flow to take place

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4

A safety valve in a locomotive starts leaking. The leaking medium will be

A. Water

B. Dry steam

C. Wet steam

D. Super heated steam

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4

In an impulse reaction turbine, the pressure drops gradually and continuously over

A. Fixed blades

B. Moving blades

C. Both fixed and moving blades

D. None of these

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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

The efficiency of a pressure-velocity compounded impulse turbine is __________ as compared to pressure compounded impulse turbine.

A. Same

B. Less

C. More

D. None of these