mechanical engineering MCQs – Page 106

Practise multiple-choice questions from mechanical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

mechanical engineering Mcqs

1. compressors gas turbines and jet engines 2. theory of machines 3. nuclear power plants 4. engineering materials 5. strength of materials mechanical engineering 6. thermodynamics 7. heat transfer 8. i c engines 9. steam boilers engines nozzles and turbines 10. engineering mechanics 11. fluid mechanics mechanical engineering 12. production technology 13. machine design 14. hydraulic machines 15. workshop technology 16. refrigeration and air conditioning

2101. Ultimate analysis of fuel is determination of percentage of____________________?
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A. fixed carbon, ash, volatile matter, moisture

B. best analysis

C. higher calorific value

D. lower calorific value

E. carbon, hydrogen, nitrogen, sulphur, moisture

2102. The capacity of induced draft fan compared to forced draft fan in a boiler is__________________?
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A. unpredictable

B. same

C. less

D. less or more depending on size of boiler

E. more

2103. Gardually increasing temperature of flue gases at inlet to chimney for given steam outputs is an indication of__________________?
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A. high calorific value coal being burnt

B. raising of steam temperature

C. fouling of heat transfer surfaces

D. leakage of air

E. higher effectiveness of boiler

2104. The height of chimney in a power plant is governed by__________________?
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A. control of pollution

B. limitation of construction facilities

C. the draft to be created

D. all of the above

E. quantity of flue gases to be handled

2105. Which device is used in thermal power plants to reduce level of pollution___________________?
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A. chimney

B. induced draft fan

C. smoke meter

D. precipitator

E. pulveriser

2106. Which is not correct statement about the function of furnace____________________?
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A. mix fuel with air and ignite

B. to provide proper conditions for con-tinuous complete combustion

C. to minimise radiation losses

D. separate ash from coal

E. maintain heat supply to prepare and ignite the incoming fuel

2107. In locomotives, the draught is produced by_________________?
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A. chimney

B. induced draft fan

C. both combined A. and B.

D. steam jet draught

E. none of the above

2108. Boiler parameters are expressed by ___________________?
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A. pressure of steam in kg/cm2

B. all of the above

C. temperature of steam in C

D. tonnes/hr. of steam

E. none of the above

2109. Which is not correct statement about effect of sulphur in fuel ___________________?
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A. it helps in electrostatic precipitation of ash in flue-gases

B. none of the above

C. it has heating value

D. it erodes furnace walls

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

2110. Which is not correct statement about pulverised fuel firing ?
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A. it is the best technique for burning high ash content fuel having low fusion ash

B. heat release can be easily controlled

C. separate mills are required to powder the coal

D. fuel burns economically

E. high burning rate is possible

2111. Calorific value of coal is of the order of _______________________?
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A. 200-400 kcal/kg

B. 2000-4000 kcal/kg

C. 5000-8000 kcal/kg

D. 8000-10,000 kcal/kg

E. 800-1200 kcal/kg

2112. The feed check valve is used in order to ______________________?
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A. none of the above

B. regulate flow of boiler water

C. recirculate unwanted feed water

D. check level of water in boiler drum

E. allow high pressure feed water to flow to drum and not allow reverse flow to take place

2113. The stress developed in a material at breaking point in extension is called__________?
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A. Proof stress

B. Yield point stress

C. Breaking stress

D. Fracture stress

2114. The patrol is distilled at a temperature from :
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A. 6 to 20

B. 220 to 345

C. 15 to 120

D. 65 to 220

2115. The temperature of flue gases at air heater outlet should be__________________?
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A. below dew-point temperature of flue gases

B. above dew-point temperature of flue gases

C. less than wet bulb temperature of flue gases

D. 100C

E. above wet bulb temperature of flue gases

2116. The condition of steam in boiler drum is always ___________________?
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A. wet

B. saturated

C. supersaturated

D. superheated

E. dry

2117. Which is not the correct statement about moisture in coal ______________________?
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A. some moisture in coal helps in better burning which is not possible with completely dry coal

B. in some coals moisture may be present upto 40%

C. moisture in coal is removed before firing by heating it with hot air

D. inherent moisture and surface moisture are different things

E. it increases thermal efficiency

2118. Diesel Cycle is also known as : __________?
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A. Constant Volume cycle

B. All of above

C. Constant temperature cycle

D. Constant Pressure Cycle

2119. The proximate analysis of fuel lists__________________?
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A. various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as per-cents by weight

B. various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as per-cents by volume

C. fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash

D. fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash

E. moisture and ash free heating value

2120. With increase in load, convection superheater has_______________________?
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A. drooping characteristic

B. linear characterisstic

C. none of the above

D. flat characteristic

E. rising characteristic

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