Steam Nozzles and Turbines - Mechanical Engineering Questions and Answers

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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

Blades are equiangular

Blade velocity coefficient is unity

Blades are equiangular and frictionless

Blade solidity is 0.65

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

Ash

Volatile matter

Moisture

Hydrogen

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An economiser is generally placed between

Last superheater or reheater and air preheater

Induced draft fan and forced draft fan

Air preheater and chimney

None of the above

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All steam engines work on

Zeroth law of thermodynamics

First law of thermodynamics

Second law of thermodynamics

None of these

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The basic purpose of drum in boiler is to

Serve as storage of steam

Serve as storage of feed water for water wall

Remove salts from water

Separate steam from water

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A steam nozzle converts

Heat energy of steam into kinetic energy

Kinetic energy into heat energy of steam

Heat energy of steam into potential energy

Potential energy into heat energy of steam

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The fire tubes in a Scotch marine boiler are

Horizontal

Vertical

Inclined

None of these

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The fire tubes in, a Coarran and Scottish marine boiler are

Horizontal

Vertical

Inclined

Both horizontal and vertical

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A safety valve mainly used with locomotive and marine boilers is

Lever safety valve

Dead weight safety valve

High steam and low water safety valve

Spring loaded safety valve