mechanical engineering MCQs – Page 168

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 Review each marked answer and report any item that may be outdated or unclear.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

3341. Mechanical equivalent of heat for 1 kcal or Joules equivalent is equal to_________________?
0

A. 102 kgm

B. 75 kgm

C. 539 kgm

D. 421 kgm

E. 421 kgm

3342. The diameters of fire tubes and superheaer tubes in locomotive boiler are_________________?
0

A. 32.5 mm, 180 mm

B. 65.5 mm, 210 mm

C. 47.5 mm, 130 mm

D. 24.5 mm, 65 mm

3343. During polytropic process_________________?
0

A. steam may be wet, dry or superheated after expansion

B. work is done

C. none of the above

D. all of the above

E. heat transfer takes place across cylinder walls

3344. The dry saturated steam at very high pressure (150-200 kg/cm2) when throttled to atmosphere will become_______________?
0

A. remain dry saturated

B. wet

C. none of the above

D. superheated

E. dry

3345. Water boils when its vapour pressure ___________________?
0

A. equals 760 mm of mercury

B. equals to atmospheric pressure

C. equals that of the surroundings

D. boiling has ^nothing to do with vapour pressure

E. equals the pressure of water in the container

3346. A boiler in India should conform to safety regulations of__________________?
0

A. BS

B. DIN

C. GOST

D. IBR

E. ASTM

3347. In a throttling process_________________?
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A. internal energy of steam changes

B. all of the above

C. none of the above

D. work is done by the expanding steam

E. heat transfer takes place

3348. Carbonation of coal is the process of________________________?
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A. heating wood in a limited supply of air at temperatures below 300C

B. binding the pulverised coal into brick-ettes

C. strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel

D. enriching carbon in the coal

E. pulverising coal in inert atmosphere

3349. Pick up the correct statement as regards Cornish boiler and Lancashire boiler _______________?
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A. cornish is fire tube and lancashire is water tube

B. cornish is water tube and lancashire is fire tube

C. cornish has two fire tubes and lancashire has one

D. lancashire has two fire tubes and cornish has one

E. both have two fire tubes

3350. Efficiency of rankine cycle can be increased by_________________?
0

A. decreasing exhaust pressure

B. increasing number of regenerative heaters

C. decreasing initial steam pressure and temperature

D. increasing exhaust pressure

E. increasing the expansion ratio

3351. The coal requirement per kW hour generation in the thermal power plant is of the order of__________________?
0

A. 1.5 to 2 kg

B. 0.2 to 0.4 kg

C. 1.0 to 1.5 kg

D. 0.6 to 0.8 kg

E. 0.1 to 0.2 kg

3352. Coke is produced by__________________?
0

A. enriching carbon in the coal

B. pulverising coal in inert atmosphere

C. strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel

D. heating wood in a limited supply of air at temperatures below 300GC

E. binding the pulverised coal into brick-etts

3353. Stoichiometric quantity of air is the___________________?
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A. air required for optimum combustion so as to have reasonable excess air

B. air present in atmosphere at NTP conditions

C. air required to convert CO into C02

D. air required to form an explosive mixture

E. air required for complete combustion of fuel with no excess air

3354. The dry saturated steam at very low pressure, (5-10 kg/cm2) when throttled to atmosphere will become________________?
0

A. wet

B. none of the above

C. superheated

D. remain dry satruated

E. dry

3355. The increase in pressure _________________?
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A. raises the boiling point of a liquid

B. lowers the boiling point of a liquid

C. none of the above

D. .does not affect the boiling point of a liquid

E. reduces its volume

3356. Which of the following substance will have same percentage in both proximate and ultimate analysis___________________?
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A. ash

B. volatile matter

C. moisture

D. hydrogen

E. none of the above

3357. The basic purpose of drum in boiler is to_____________________?
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A. serve as storage of feed water for water wall

B. control level

C. serve as storage of steam

D. remove salts from water

E. separate steam from water

3358. While steam expands in turbines, theoretically the entropy________________?
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A. decreases

B. remains constant

C. none of the above

D. increases

E. behaves unpredictably

3359. For burning 1 kg of carbon to CO as per chemically correct combusiton, amount of air required is___________________?
0

A. 8/3kg

B. 2 kg

C. 4/3kg

D. 1 kg

E. 16/3 kg

3360. In locomotive boiler, maximum steam pressure is limited to_______________?
0

A. 31 kg/cm2

B. 1 kg/cm2

C. 18 kg/cm2

D. 5 kg/cm2

E. 10 kg/cm2

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