mechanical engineering MCQs – Page 102

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 Review each marked answer and report any item that may be outdated or unclear.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

2021. For very great pressures, viscosity of moss gases and liquids__________________?
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A. none of the above

B. shows erratic behavior

C. remains same

D. increases

E. decreases

2022. Water boils when its vapour pressure ___________________?
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A. equals that of the surroundings

B. boiling has ^nothing to do with vapour pressure

C. equals 760 mm of mercury

D. equals the pressure of water in the container

E. equals to atmospheric pressure

2023. A packaged boiler is one in which various parts like firing equipment, fans, feed pumps and automatic controls are________________?
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A. none of the above

B. supplied by same manufacturer loose and assembled at site

C. packaged boiler does not exist

D. supplied mounted on a single base

E. purchased from several parties and packed together at site

2024. The resultant upward pressure of the fluid on an immersed body due to its tendency to uplift the sub-merged body is called_______________?
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A. upthrust

B. metacentre

C. center of pressure

D. reaction

E. buoyancy

2025. Presence of moisture in fuel oil would____________________?
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A. aid in proper combustion

B. clean the nozzles

C. keep the burner tips cool

D. cause sputtering, possibly extinguishing flame

E. reduce flame length

2026. For a floating body to be in stable equilibrium, its metacentre should be___________________?
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A. below the center of buoyancy

B. below the center of gravity

C. above the center of gravity

D. above the center of buoyancy

E. between e.g. and center of pressure

2027. With increase in load, radiant super heater has____________________?
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A. drooping characteristic

B. none of the above

C. rising characteristic

D. flat characteristic

E. lihear characterisstic

2028. The equation of continuity holds good when the flow____________________?
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A. is steady

B. velocity is uniform at all the cross sections

C. none of the above

D. is one dimensional

E. all of the above

2029. On Mollier chart, free expansion, or throttling process from high pressure to atmosphere is represented by_______________?
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A. straight inclined line

B. horizontal straight line

C. curved line

D. vertical straight line

E. none of the above

2030. In a throttling process________________?
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A. steam volume remains constant

B. steam enthalpy remains constant

C. steam temperature remaisn constant

D. steam entropy remains constant

E. steam pressure remains constant

2031. The evaporation of 15.653 kg of water per hour from and at 100C is called_________________?
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A. boiler efficiency

B. one boiler h.p.

C. equivalent evaporation

D. evaporative capacity

E. factor of evaporation

2032. The diameter of fire tubes in Cochran boiler is of the order of___________________?
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A. 6 Cm ,

B. 15 cm

C. 12 cm

D. 8 cm

E. 2 cm

2033. Alkaline pyrogallate is used in Orsats apparatus for absorption of _________________?
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A. CO

B. C02

C. 02

D. N2

E. none of the above

2034. Carbonation of coal is the process of________________________?
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A. pulverising coal in inert atmosphere

B. heating wood in a limited supply of air at temperatures below 300C

C. binding the pulverised coal into brick-ettes

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

E. enriching carbon in the coal

2035. 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

2036. Hard coke is used in________________?
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A. blast furnace

B. domestic use

C. cement industry

D. locomotives

E. thermal power plant

2037. 02 content in atmospheric air on volume basis is___________________?
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A. 40%

B. 21%

C. 23%

D. 30%

E. 70%

2038. Pick up the wrong statement?
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A. manganese in steel induces hardness

B. sulphur, phosphorous and lead improve machining properties of steel

C. nickel and chromium in steel help in raising the elastic limit and improve the resilience and ductility

D. aluminium in steel results in excessive grain growth

E. tungsten in steels improves magnetic properties and hardenability

2039. The vapour pressure over the concave surface is______________________?
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A. none of the above

B. greater than the vapour pressure over the plane surface

C. equal to the vapour pressure over the plane surface

D. zero

E. less man the vapour pressure over the plane surface

2040. One kilowatt-hour energy is equivalent to ________________?
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A. 1000 kJ

B. 1000 J

C. 3600 kW/sec

D. 360 kJ

E. 3600 kJ

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