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4

In an impulse turbine

A. The steam is expanded in nozzles only and there is a pressure drop and heat drop

B. The steam is expanded both in fixed and moving blades continuously

C. The steam is expanded in moving blades only

D. The pressure and temperature of steam remains constant

Correct Answer :

A. The steam is expanded in nozzles only and there is a pressure drop and heat drop


Related Questions

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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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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

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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4

Thermal efficiency of a thermal power plant is of the order of

A. 15 %

B. 20 %

C. 30 %

D. 45 %

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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

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4

The discharge is __________ at critical pressure.

A. Zero

B. Minimum

C. Maximum

D. None of these

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4

The efficiency of reaction turbine is maximum when (where α = Angle made by the absolute velocity V at inlet)

A. Vb = 0.5 V cosα

B. Vb = V cos α

C. Vb = 0.5 V² cosα

D. Vb = V² cosα

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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

Heating wet steam at constant temperature is heating it at constant

A. Volume

B. Pressure

C. Entropy

D. Enthalpy

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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

The working pressure range for a LaMont boiler is

A. 0.5 to 10 MN/m²

B. 1 to 15 MN/m²

C. 2.5 to 15 MN/m²

D. 3.5 to 20 MN/m²

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4

Throttle governing of steam engines is a method of controlling the engine output by varying

A. Volume of intake steam

B. Pressure of intake steam

C. Temperature of intake steam

D. All of these

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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

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

Evaporative capacity of boiler is expressed as

A. kg of steam produced

B. Steam pressure produced

C. kg of fuel fired

D. kg of steam produced per kg of fuel fifed

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4

In a reaction turbine, when steam flows through the fixed 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 heat loss in a boiler takes place in the form of

A. Heat carried away by flue gases

B. Heat carried away by ash

C. Moisture present in fuel and steam formed by combustion of hydrogen in fuel

D. All of the above

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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

One kilowatt-hour energy is equivalent to

A. 1000 J

B. 360 kJ

C. 3600 kJ

D. 3600 kW/sec

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4

Lancashire boiler is

A. Stationary fire tube boiler

B. Internally fired boiler

C. Horizontal boiler

D. All of these

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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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The evaporation of 15.653 kg of water per hour from and at 100°C is called

A. Evaporative capacity

B. Factor of evaporation

C. Equivalent evaporation

D. One boiler h.p.

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4

Which is not correct statement about effect of sulphur in fuel?

A. It has heating value

B. It helps in electrostatic precipitation of ash in flue gases

C. It leads to corrosion of air heaters, ducting, etc. if flue gas exit temperature is low

D. It erodes furnace walls

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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

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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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

Which of the following boiler works on a forced circulation of water?

A. Lamont boiler

B. Benson boiler

C. Loeffler boiler

D. All of these

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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 function of an eccentric rod is

A. To provide reciprocating motion to the slide valve

B. To convert reciprocating motion of the piston into rotary motion of the crank

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

D. To provide simple harmonic motion to the D-slide valve

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4

The impulse reaction turbine has its driving force

A. As an impulsive force

B. As a reaction force

C. Partly as an impulsive force and partly as a reaction force

D. None of the above