Steam Nozzles and Turbines - Mechanical Engineering Questions and Answers

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Which of the following statement is correct?

A horizontal steam engine requires less floor area than a vertical steam engine

The steam pressure in the cylinder is not allowed to fall below the atmospheric pressure

The compound steam engines are generally non-condensing steam engines

All of the above

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Which of the following statement is correct?

Lancashire boiler is a fire tube boiler

Fire tube boilers are internally fired

Babcock and Wilcox boiler is a water tube boiler

All of the above

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Which of the following statement is correct?

A fire tube boiler occupies less space than a water tube boiler, for a given power

Steam at a high pressure and in large quantities can be produced with a simple vertical boiler

A simple vertical boiler has one fire tube

All of the above

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The change in internal energy in steam engines equals to

Work done during the Rankine cycle

Work done during compression

Work done during adiabatic expansion

Change in enthalpy

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Spontaneous combustion is a phenomenon in which

All the fuel burns instantaneously producing high energy release

Fuel burns with less air

Coal bursts into flame without any external ignition source but by itself due to gradual increase in temperature as a result of heat released by combination of oxygen with coal

Explosion in furnace

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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

ps - pa

pa - ps

pa + ps

None of these