mechanical engineering MCQs – Page 96

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 Review each marked answer and report any item that may be outdated or unclear.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

1901. Which of the following is a fire tube boiler________________?
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A. Stirling boiler.

B. Babcock and Wilcox boiler

C. none of the above

D. all of the above

E. locomotive boiler

1902. Choose the wrong statement ?
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A. Relative density of liquids can be determined by means of the depth of flotation of hydrometer

B. The point through which buoyant force acts, is called the center of buoyancy

C. any weight, floating or immersed in a liquid, is acted upon by a buoyant force

D. Center of buoyancy is located above the center of gravity of the displaced liquid v

E. Buoyant force is equal to the weight of the liquid displaced

1903. Which of the following coals has the highest calorific value_________________?
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A. anthracite coal

B. bituminous coal

C. peat

D. lignite

E. wood

1904. Surface energy per unit area of a surface is numerically equal to _____________________?
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A. force of cohesion

B. atmospheric pressure

C. surface tension

D. viscosity

E. force of adhesion

1905. The process of diffusion of one liquid into the other through a semi-permeable membrane is called_______________________?
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A. diffusivity

B. cohesion

C. viscosity

D. surface tension

E. osmosis

1906. A hydraulic press has a ram of 15 cm diameter and plunger of 1.5 cm. It is required to lift a weight of 1 tonne. The force required on plunger is equal to_________________?
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A. 1000 kg

B. 1 kg

C. 100 kg

D. 10,000 kg

E. 10 kg

1907. Which of the following boilers is best suited to meet fluctuating demands___________________?
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A. babcock and wilcox

B. cochran

C. lancashire

D. comish

E. locomotive

1908. Locomotive boiler is of the following type__________________?
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A. internally fired

B. multitubular

C. all of the above

D. mobile

E. horizontal

1909. The value of the coefficient of compressibility for water at ordinary pressure and temperature in kg/cm is equal to_________________?
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A. 21,000

B. 2700

C. 1000

D. 2100

E. 10,000

1910. Hydrometer is used to determine____________________?
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A. relative humidity

B. specific gravity of gases

C. specific gravity of liquids

D. density

E. specific gravity of solids

1911. The coal requirement per kW hour generation in the thermal power plant is of the order of__________________?
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A. 1.0 to 1.5 kg

B. 0.2 to 0.4 kg

C. 0.1 to 0.2 kg

D. 0.6 to 0.8 kg

E. 1.5 to 2 kg

1912. Incomplete combustion can be best judged by__________________?
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A. excess air in flue gases

B. measuring oxygen in flue gases

C. smoky chimney exit

D. measuring carbon mono-oxide in flue gases

E. measuring temperature of flue gases at exit of furnace

1913. An ideal regenerative cycle is ______________________?
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A. more than carnot cycle

B. none of the above

C. equal to carnot cycle

D. less than carnot cycle

E. could be anything

1914. Tertiary air is the air used to____________________?
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A. cool the scanners

B. provide air around burners for obtaining optimum combustion

C. supply air for ignitors

D. convert CO (formed in lower zone of furnace) into C02 at higher zone

E. transport and dry the coal

1915. The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the centriod, if___________________?
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A. all of the above

B. the area is horizontal

C. none of the above

D. the area is vertical

E. the area is inclined

1916. Viscosity of water in comparison to mercury is_________________?
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A. higher

B. lower

C. higher/lower depending on temperature

D. unpredictable

E. same

1917. A boiler in India should conform to safety regulations of__________________?
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A. GOST

B. ASTM

C. DIN

D. IBR

E. BS

1918. Equivalent evaporation is the amount of water evaporated in a boiler from and at ____________________?
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A. saturation temperature at given pressure

B. 20C

C. room temperature

D. 100C

E. 0C

1919. Efficiency of a thermal cycle increases by ________________?
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A. regeneration

B. reheating of steam

C. both A. and B.

D. cooling of steam

E. none of the above

1920. 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. throttling calorimeter

C. separating calorimeter

D. combined separating and throttling calorimeter

E. bucket calorimeter

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