Power Plant Questions and Answers – Air Preheaters, ESP and Deareration

This set of Power Plant Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Air Preheaters, ESP and Deareration”.

1. The relative efficiency is defined as?
a) ratio of thermal efficiency to rankine efficiency
b) ratio of brake power to the indicated power
c) ratio of heat equivalent to indicated power to the energy supplied in steam
d) product of thermal efficiency & Rankine efficiency
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2. Lancashire boiler is ___________
a) stationary fire tube boiler
b) horizontal boiler
c) internally fired boiler
d) all of the mentioned
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3. The heat balance sheet for the boiler shows the ___________
a) steam formed by combustion of hydrogen per kg of fuel
b) moisture present in the fuel
c) complete account of heat supplied by 1 kg of dry fuel & the heat consumed
d) all of the mentioned
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4. A compound steam engine in which piston rods of high pressure & low pressure cylinders are attached to two different crank sets at 1800 to each other, is called ___________
a) Tandem type compound engine
b) Receiver type compound engine
c) Woolf type compound engine
d) none of the mentioned
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5. The actual vacuum in a condenser is equal to ___________
a) barometric pressure – actual pressure
b) barometric pressure + actual pressure
c) gauge pressure – atmospheric pressure
d) gauge pressure + atmospheric pressure
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6. The high steam and low water safety valve is used to blow off steam when the ___________
a) steam pressure exceeds the working pressure
b) water level in the boiler becomes too low
c) none of the mentioned
d) steam pressure exceeds the working pressure & water level in the boiler becomes too low
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7. The performance of a boiler is measured by the ___________
a) dry flue gases
b) steam formation
c) moisture in fuel
d) unburnt carbon
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8. Benson boiler requires ___________
a) 2 drums
b) 3 drums
c) 0 drums
d) 1 drum
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9. The cylinder condensation or missing quantity may be reduced by ___________
a) keeping the expansion ratio small in each cylinder
b) superheating the steam supplied to the engine cylinder
c) the efficient steam jacketing of the cylinder walls
d) all of the mentioned
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10. In a Tandem type compound engine, the high pressure and low pressure cylinders ___________
a) have common piston rods
b) have separate piston rods
c) are set at 90 degrees
d) are set in V-arrangement
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11. A device used in a boiler to control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required, is known as?
a) fusible plug
b) superheater
c) stop valve
d) blow off cork
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12. The performance of a boiler is measured by the ___________
a) steam produced in kg/h
b) steam produced in kg/kg of fuel burnt
c) amount of water evaporated per hour
d) all of the mentioned
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13. The high pressure and low pressure cylinders in a receiver type compound engine are regarded as having cranks at ___________
a) 180° to each other
b) 90° to each other
c) 0° to each other
d) none of the mentioned
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14. Throttle governing of steam engines is a method of controlling the engine output by varying ___________
a) volume of intake steam
b) pressure of intake system
c) temperature of intake system
d) none of the mentioned
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15. What is the aim of a compound steam engine?
a) to reduce the ratio of expansion in each cylinder
b) to reduce the temperature range in each cylinder
c) to reduce the length of stroke
d) all of the mentioned
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Sanfoundry Global Education & Learning Series – Power Plant Engineering.

To practice all areas of Power Plant Engineering, here is complete set of 1000+ Multiple Choice Questions and Answers.

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