mechanical engineering MCQs – Page 170

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 Review each marked answer and report any item that may be outdated or unclear.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

3381. The number of flue tubes in Lancashire boiler is_________________?
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A. two

B. one

C. many

D. zero

E. four

3382. Cochran boiler is a__________________?
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A. horizontal water-tube boiler

B. forced circulating boiler

C. horizontal fire-tube boiler

D. vertical fire tube boiler

E. veritcal water-tube boiler

3383. Water tube boilers are those in which________________?
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A. none of the above

B. change in enthalpy

C. water passes through the tubes and flue gases around it

D. flue gases pass through tubes and water around it

E. work is done during adiabatic expansion

3384. One kg of steam sample contains 0.8 kg dry steam; its dryness fraction is__________________?
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A. 0.8

B. 0.2

C. 0.6

D. 1

E. 0.5

3385. Which of the following is a fire tube boiler________________?
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A. all of the above

B. Babcock and Wilcox boiler

C. locomotive boiler

D. none of the above

E. Stirling boiler.

3386. At critical point, i.e. p=225.65 kg/cm2, the latent enthalpy of vaporisation is______________?
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A. minimum

B. none of the above

C. zero

D. depends on temperature also

E. maximum

3387. 1 kg.m is equal to_________________?
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A. All Joules

B. 102 Joules

C. 9.81 Joules

D. 427 Joules

E. 539 Joules

3388. Locomotive boiler is of the following type__________________?
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A. horizontal

B. internally fired

C. multitubular

D. all of the above

E. mobile

3389. An ideal regenerative cycle is ______________________?
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A. more than carnot cycle

B. less than carnot cycle

C. could be anything

D. none of the above

E. equal to carnot cycle

3390. The equivalent evaporation of a boiler is a measure to compare _________________?
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A. the given boiler with the model

B. the two different boilers of the same make

C. two boilers of same make but operaing under different conditions

D. any type of boilers operating under any conditions

E. two different makes of boilers operating under the same operating conditions

3391. The change in internal energy in steam engines equals to__________________?
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A. work done during the rankine cycle ;

B. work done during adiabatic expansion

C. change in enthalpy

D. work done during compression.

E. none of the above

3392. Orsat meter is used for__________________?
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A. gravimetric analysis of the flue gases

B. volumetric analysis of the flue gases

C. mass flow of the flue gases

D. measuring smoke density of flue gases

E. none of the above

3393. Pick up the wrong statement about critical condition of steam___________________?
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A. all properties of liquid and steam are same

B. specific volume of steam and liquid is same

C. latent heat is zero

D. liquid directly becomes steam

E. this is the maximum pressure limit

3394. The crown of the fire box is made hemispherical in order to___________________?
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A. withstand pressure inside boiler ,

B. enable easy,manufacture

C. give maximum space

D. resist intense heat in fire box

E. give maximum strength

3395. Alkaline pyrogallate is used in Orsats apparatus for absorption of _________________?
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A. 02

B. N2

C. C02

D. none of the above

E. CO

3396. The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is__________________?
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A. more

B. equal

C. less

D. may be less or more depending on temperature

E. unpredictable

3397. The state of vapour under saturation condition is described by_______________?
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A. dryness fraction alone

B. pressure alone

C. temperature alone

D. pressure and temperature

E. pressure and dryness fraction

3398. Heating of dry steam above saturation temperature is known as_____________________?
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A. enthalpy

B. latent heat

C. superheating

D. supersaturation

E. super tempering

3399. Fire tube boilers are those in which__________________?
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A. tubes are laid vertically

B. water passes through the tubes and flue gases around it

C. none of the above

D. forced circulation takes place

E. flue gases pass through tubes and water around it

3400. Lancashire boiler is of____________________?
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A. all of the above

B. stationary<fire tube-type

C. natural cirulation type

D. horizontal type

E. internally fired type

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