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4

The critical pressure ratio for initially wet steam is

A. 0.546

B. 0.577

C. 0.582

D. 0.601

Correct Answer :

C. 0.582


Related Questions

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4

De-Laval turbine is a

A. Simple impulse turbine

B. Simple reaction turbine

C. Impulse-reaction turbine

D. None of these

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4

The purpose of governing in steam turbines is to

A. Maintain the speed of the turbine

B. Reduce the effective heat drop

C. Reheat the steam and improve its quality

D. Completely balance against end thrust

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4

In forced circulation steam boilers, the force is applied

A. To draw water

B. To circulate water

C. To drain off the water

D. All of these

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4

100% efficiency of a thermal cycle cannot be achieved because of

A. Frictional losses

B. It is not possible to achieve 0°K temperature

C. Leakage

D. Non availability of ideal substance

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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

Efficiency of a thermal cycle increases by

A. Regeneration

B. Reheating of steam

C. Both (A) and (B)

D. Cooling of steam

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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

Sulphur content of fuels is very important to the plant operators because it

A. Has high heating value

B. Retards electric precipitation

C. Promotes complete combustion

D. Has highly corrosive effect

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4

The function of a flywheel is

A. To convert reciprocating motion of the piston into rotary motion

B. To convert rotary motion of the crankshaft into to and fro motion of the valve rod

C. To prevent fluctuation of speed

D. To keep the engine speed uniform at all load conditions

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4

Natural water circulation, by convection in water tube boilers, with increase in pressure of boiler

A. Increases

B. Decreases

C. Remain unaffected

D. First increases and then decreases

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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

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 maximum discharge through a chimney occurs when the height of chimney is

A. Infinitely long

B. Around 200 meters

C. Equal to the height of the hot gas column producing draught

D. Outside temperature is very low

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4

In reaction turbines, the axial thrust is due to

A. Pressure drop across the rotor

B. Change in axial velocity

C. Both (A) and (B)

D. None 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

Equivalent evaporation is the amount of water evaporated in a boiler from and at

A. 0°C

B. 100°C

C. Saturation temperature at given pressure

D. Room temperature

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4

An economiser is generally placed between

A. Last superheater or reheater and air preheater

B. Induced draft fan and forced draft fan

C. Air preheater and chimney

D. None of the above

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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

Thermal efficiency of well maintained boiler will be of the order

A. 40 %

B. 50 %

C. 75 %

D. 90 %

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4

Pour point of fuel oil is the

A. Lowest temperature at which oil will flow under set condition

B. Storage temperature

C. Temperature at which fuel is pumped through burners

D. Temperature at which oil is transported

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4

The missing quantity per stroke is equal to

A. Cylinder feed indicated mass of steam

B. Cylinder feed + indicated mass of steam

C. Mass of cushion steam + indicated mass of steam

D. Mass of cushion steam + cylinder feed

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4

The fire tubes in a Cochran boiler are

A. Horizontal

B. Vertical

C. Inclined

D. None of these

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4

Willians line for the steam engine is a straight line relationship between the steam consumption per hour and

A. Indicated power

B. Brake power

C. Efficiency

D. Pressure of steam

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4

The high pressure and low pressure cylinders in a Tandem 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

When the speed of the crankshaft is between 100 r.p.m. and 250 r.p.m., the engine said to be a

A. Slow speed engine

B. Medium speed steam engine

C. High speed steam engine

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

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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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 pressure of steam in the engine cylinder at the beginning of the stroke is ________ the boiler pressure.

A. Equal to

B. Less than

C. Higher than

D. None of these

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4

The ratio of heat equivalent to brake power to the energy supplied in steam is known as

A. Mechanical efficiency

B. Overall efficiency

C. Indicated thermal efficiency

D. Brake thermal efficiency