mechanical engineering MCQs – Page 107

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 Review each marked answer and report any item that may be outdated or unclear.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

2121. For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has ____________________?
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A. heating surface depends on other parameters

B. equal heating surface

C. less heating surface

D. more heating surface

E. none of the above

2122. In designing air preheater, the important design consideration is that_________________?
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A. handling and maintenance should be easier

B. stack gases should not be cooled to the dew point

C. approach temperature should be as low as possible

D. none of the above

E. heat transfer area should be optimum

2123. Gusset stays in a boiler are provided to____________________?
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A. avoid explosion in furnace

B. support furnace freely from top

C. prevent atmospheric air leaking into furnace

D. prevent leakage of hot flue gases

E. prevent the bulging of flat surfaces

2124. The basic job of feed water treatment in boilers is to overcome the problem of __________________?
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A. all of the above

B. embrittlement

C. carryover

D. scale

E. corrosion

2125. In ordetjo obtain superheated steam, a superheater is added in an existing boiler. As as result, furnace vacuum will _________________?
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A. may improve/worsen depending on size

B. unpredictable

C. remain unaffected

D. improve C. worsen

2126. Feed water conditioning in thermal power plants in done to__________________?
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A. increase *heat transfer rate

B. increase steam parameters

C. all of the above

D. increase efficiency-of thermal power plant

E. reduce hardness and for removal of solids

2127. Atmospheric pressure is equal to____________?
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A. All of these

B. 1.013 bar

C. 101.3KN/m2

D. 760mm of Hg

2128. Farad is the unit of___________?
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A. inductance

B. capacitance

C. None of these

D. voltage

2129. The safety valve on boiler drum compared to safety valve on super heater is set at ________________?
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A. lower value

B. lower/higher depending on steam flow

C. unpredicatble

D. same value

E. higher value

2130. The size of a boiler drum in pulverised fuel fired boiler,as its size and capacity, (steam pressure and flow ratings) increase __________________?
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A. increases

B. remains unchanged

C. decreases

D. unpredictable

E. increases/decreases depending on steam temperature requirements

2131. Which of the following solid fuel has high caloric value : ___________?
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A. Peat

B. Wood

C. Anthracite coal

D. Bituminous coal

2132. Pick up wrong statement about desired properties of a good fuel__________________?
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A. produce minimum smoke and gases

B. ease in storing

C. ecomomical

D. high ignition point

E. high calorific value

2133. Which of the following solid fuel has high carbon content?
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A. None of these

B. Peat

C. Coke

D. Coal

2134. Which of the following is mostly used used as blast furnace fuel for extracting pig iron from iron ores?
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A. Brown coal

B. Anthracite coal

C. Woodchar coal

D. Hard coke

2135. What is the weight (in lbf) of one gallon of air at 1 atm and 25?C? The molecular mass of air is 28.97 g/mole = 0.02897 kg/mole
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A. 0.00989 lbf

B. 65.78lbf

C. 3.00989 lbf

D. 90lbf

2136. Which of the following are used in diesel engines and oil fired boilers :
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A. Gasoline

B. Patrol

C. Heavy fuel oils

D. Paraffin

2137. The efficiency of the ideal diesel cycle is ________ than that of Otto cycle, for the same compression ratio
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A. None of these

B. Equal

C. Higher

D. Lower

2138. Compression efficiency is compared against_____________________?
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A. isothermal compression

B. adiabatic compression

C. isentropic compression

D. botii isothermal and adiabatic compression

E. ideal compression

2139. During peak load periods, the best method of controlling compressors is___________________?
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A. constant speed unloader

B. relief valve

C. start-stop motor

D. variable speed

E. none of the above

2140. Out of the following, from where you will prefer to take intake for air compressor_________________?
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A. from any one of the above locations

B. from coal yard side

C. from outside atmosphere at 1C

D. from an air conditioned room maintained at 20C

E. from a side where cooling tower is located nearby

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