mechanical engineering MCQs – Page 171

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 Review each marked answer and report any item that may be outdated or unclear.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

3401. In accelerated circulation type boiler________________?
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A. water is converted into steam in one pass without any recirculation

B. feed pump is employed to supplement natural circulation in water wall type furnace

C. water is supplied in drum and through downcomers located in atmospheric conditon it passes to the water wall and rises to durm in the from of mixture of water and steam

D. heating takes place at bottom and the water supplied at bottom gets converted into the mixture of stdam bubbles and hot water which rise to durm

E. water is fed under high pressure and high velocity

3402. Water and sediment in fuel oil can be removed by _______________________?
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A. cooling the oil in the settling tanks

B. burning the oil

C. heating the oil in the settling tanks

D. suspension

E. filtering

3403. Which type of boiler can meet rapid changes of load____________________?
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A. vertical fire tube type

B. forced circulation type

C. horizontal fire tube type

D. horizontal water tube type

E. vertical water tube type

3404. The balanced draft furnace is one using _________________________?
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A. induced draft fan and forced draft fan

B. any one of the above

C. none of the above

D. forced draft fan and chimney

E. induced draft fan and chimney

3405. Boiler parameters are expressed by ___________________?
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A. all of the above

B. none of the above

C. temperature of steam in C

D. tonnes/hr. of steam

E. pressure of steam in kg/cm2

3406. With increase in load, radiant super heater has____________________?
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A. flat characteristic

B. lihear characterisstic

C. none of the above

D. drooping characteristic

E. rising characteristic

3407. A safety valve in a locomotive starts leaking. The leaking medium will be_________________?
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A. water

B. dry steam

C. supersaturated steam

D. wet steam

E. super heated steam

3408. It is required to produce large amount of steam at low pressure. Which boiler should be used ?
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A. lancashire boiler

B. babcock and wilcox boiler

C. cochran boiler

D. stoker fired boiler

E. pulverised fuel fired boiler

3409. The feed check valve is used in order to ______________________?
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A. check level of water in boiler drum

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

C. recirculate unwanted feed water

D. none of the above

E. regulate flow of boiler water

3410. In which of the following boilers, the draught in furnace is increased by utilising exhaust steam from engine__________________?
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A. locomotive boiler

B. babcock and wilcox boiler

C. benson boiler

D. cochran boiler

E. lancashire boiler

3411. In a recuperative air preheater, the heat is transferred____________________?
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A. heat is transferred by bleeding some gases from furnace

B. from heating an itermediate material and then heating the air from this material

C. from a metal wall from one medium to another

D. none of the above

E. by direct mixing ,

3412. The pressure at which latent heat of vaporisation of water is zero, is_________________?
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A. 1 kg/cm2

B. 100 kg/cm2

C. 170 kg/cm2

D. 225.6 kg/cm2

E. below atmospheric pressure

3413. Pick up wrong statement about desired properties of a good fuel__________________?
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A. high calorific value

B. ecomomical

C. ease in storing

D. high ignition point

E. produce minimum smoke and gases

3414. The radius of a dished head is taken approximately as______________________?
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A. half

B. three

C. one

D. two

E. one-fourth

3415. Incomplete combustion can be best judged by__________________?
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A. measuring oxygen in flue gases

B. measuring temperature of flue gases at exit of furnace

C. smoky chimney exit

D. excess air in flue gases

E. measuring carbon mono-oxide in flue gases

3416. The condition of steam in boiler drum is always ___________________?
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A. dry

B. superheated

C. saturated

D. supersaturated

E. wet

3417. Presence of moisture in fuel oil would____________________?
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A. clean the nozzles

B. reduce flame length

C. aid in proper combustion

D. cause sputtering, possibly extinguishing flame

E. keep the burner tips cool

3418. Vacuum for reciprocating steam engines compared to steam turbines is__________________?
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A. more

B. equal

C. less

D. could be more or less depending on the size of plant

E. none of the above

3419. In water wall furnace, the heat is transferred to the water-walls by _________________?
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A. radiation and convection

B. convection

C. radiation

D. conduction

E. radiation and conducton

3420. A supercritical boiler is one that operates above the pressure and temperature of following values_____________________?
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A. 218 kg/cm2 abs and 540C

B. 100 kg/cm2 and 540C

C. 1 kg/cm2 and 100C

D. 100 kg/cm2 abs and 373C

E. 218 kg/cm2 abs and 373C

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