mechanical engineering MCQs – Page 175

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 Review each marked answer and report any item that may be outdated or unclear.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

3481. Water at pressure of 4 kg/cm2 and 160C temperature when exposed to atmosphere will_________________?
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A. remain as it was

B. cool down

C. none of the above

D. flash i.e. get converted into steam

E. boil

3482. The ultimate analysis of fuel lists _____________________?
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A. moisture and ash free heating value

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

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

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

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

3483. At which pressure the properties of water and steam become identical_________________?
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A. 225.6 kg/cm2

B. 1 kg/cm2

C. 100 kg/cm2

D. 0.1 kg/cm2

E. it is never possible

3484. Steam in water tube boiler as compared to fire tube boiler_________________?
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A. can be raised rapidly

B. is raised at same rate

C. none of the above is true

D. could be raised at fast/slow rate depending on design

E. is raisd at slower rate

3485. The proximate analysis of fuel lists__________________?
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A. various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as per-cents by volume

B. moisture and ash free heating value

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

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

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

3486. The maximum discharge through a chimney occurs when the height of chimney is_____________________?
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A. equal to the height of the hot gas column producing draught

B. outside temperature is very low

C. more than the tallest building nearby

D. around 200 meters

E. infinitely long

3487. The fusible plug in small boilers is located ________________?
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A. over the combustion chamber

B. in the drum

C. above steam dome

D. at the inlet of chimney

E. in the fire tubes

3488. The height of chimney in a power plant is governed by__________________?
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A. quantity of flue gases to be handled

B. limitation of construction facilities

C. all of the above

D. the draft to be created

E. control of pollution

3489. Caking coals are those which __________________________?
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A. do not form ash

B. form lumps or masses of coke

C. burn completely

D. burn freely

E. show little or no fusing action

3490. The safety valve at superheater as compared to drum safety valve setting is set at___________________?
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A. same value

B. lower value

C. any value

D. higher value

E. none of the above

3491. Sulphur content of fuels is very important to the plant operators because it____________________?
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A. facilitates ash removal

B. promotes complete combustion

C. has high heating value

D. has highly corrosive effect

E. retards electric precipitation

3492. Maximum energy loss in a boiler occurs due to _______________________?
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A. radiation losses

B. ash content

C. unburnt carbon in ash

D. flue gases

E. incomplete combustion

3493. On Millier chart, the constant pressure lines_________________?
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A. diverge from right to left

B. none of the above

C. are equally spaced throughout

D. diverge from left to right

E. first rise up and then fall

3494. Expanding steam to a very low pressure (high vacuum) in steam engines is _________________?
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A. economical

B. optional

C. desirable

D. uneconomical

E. essential

3495. The relative heat absorption for successively added equal areas of boiler convection heating surfaces____________________?
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A. first decreases and then increases

B. remains unaffected

C. first increases and then decreases

D. decreases

E. increases

3496. A fusible plug is fitted in small boilers in order to ___________________?
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A. extinguish fire if water level in the boiler falls below alarming limit

B. control steam dome

C. avoid explosion

D. remove molten aslj

E. avoid excessive build up of pressure

3497. Boiler stays are used to___________________?
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A. provide foundation of boiler

B. provide support for boiler

C. take care of failure in compression

D. take care of failure in shear

E. prevent flat surfaces under pressure from tearing apart

3498. The difference between cornish boiler and lancashire boiler is that_________________?
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A. former is fire tube type and latter is water tube type boiler

B. former is water tube type and latter is fire tube type

C. former contains one fire tube and latter contains two fire tubes

D. none/of the above

3499. If a steam sample is nearly in dry condition, then its dryness fraction can be most accurately determined by___________________?
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A. none of the above

B. bucket calorimeter

C. throttling calorimeter

D. separating calorimeter

E. combined separating and throttling calorimeter

3500. Steam exhaust from high pressure turbine is reheated in _____________________?
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A. a separate coil located in convection path

B. economiser

C. boiler drum

D. superheater tubes

E. a separate coil

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