mechanical engineering MCQs – Page 97

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 Review each marked answer and report any item that may be outdated or unclear.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

1921. Boiler H.P. is defined as the ________________ ?
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A. the evaporation of 15.65 kg of water per hour from and at 100C into dry saturated steam

B. work done by 1 kg of steam at saturation condition

C. work done in evaporating 1 kg of steam per hour from and at 100C into dry saturated steam

D. steam evaporation rate per kg of fuel fired

E. heat consumed in evaporating 1 kg water at 0C to steam at 100C and 1.033 kg/cm pressure

1922. In order that flow takes place between two points in a pipeline, the differential pressure between these points must be more than_______________?
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A. frictional force

B. none of the above

C. viscosity

D. all of the above

E. surface friction

1923. On Mollier chart, flow through turbine is represented by ________________?
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A. none of the above

B. straight inclined line

C. curved line

D. vertical straight line

E. horizontal straight line

1924. The biggest size of thermal power unit operating in India is ________________?
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A. 30 MW

B. 210 MW

C. 500 MW

D. 60 MW

E. 100 MW

1925. According to Bernoullis equation for steady ideal fluid flow____________________?
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A. the energy is constant along a stream-line but may vary across streamlines

B. none of the above

C. principle of conservation of mass holds

D. velocity and pressure are inversely proportional

E. total energy is constant throughout

1926. Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the_________________?
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A. none of die above

B. force of adhesion

C. force of friction

D. force of diffusion

E. force of cohesion

1927. Rotameter is a device used to measure______________?
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A. velocity of fluid

B. velocity of air

C. flow

D. absolute pressure

E. rotation

1928. Bomb calorimeter is used to determine ___________________?
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A. Higher calorific value at constant pressure

B. Lower calorific value at constant pressure

C. None of the above

D. Lower calorific value at constant volume ,

E. Higher calorific value at constant volume

1929. The basic purpose of drum in boiler is to_____________________?
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A. remove salts from water

B. separate steam from water

C. serve as storage of steam

D. serve as storage of feed water for water wall

E. control level

1930. The region between the separation streamline and the boundary surface of the solid body is known as__________________?
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A. drag

B. boundary layer

C. aerofoil section

D. lift

E. wake

1931. Adiabatic process is________________?
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A. reversible process

B. constant temperature process

C. constant enthalpy process

D. non-heat transfer process

E. essentially an isentropic process

1932. Practical fluids___________________?
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A. possess none of the above properties

B. possess all the above properties

C. are compressible

D. are viscous

E. possess surface tension

1933. The equivalent evaporation of a boiler is a measure to compare _________________?
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A. any type of boilers operating under any conditions

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

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

D. the given boiler with the model

E. the two different boilers of the same make

1934. If partial pressure of air and steam be pa and ps respectively in a condenser, then according to Daltons law, the pressure in condenser is equal to__________________?
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A. non of these

B. Ps-Pa

C. pa-ps

D. Pa+P

1935. Which of the following varieties of coals is mostly used in steam boilers____________________?
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A. brown coal

B. peat

C. non-coking bituminous coal

D. coking bituminous coal

E. none of the above

1936. Boiler stays are used to___________________?
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A. take care of failure in compression

B. take care of failure in shear

C. provide foundation of boiler

D. prevent flat surfaces under pressure from tearing apart

E. provide support for boiler

1937. During polytropic process_________________?
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A. heat transfer takes place across cylinder walls

B. none of the above

C. work is done

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

E. all of the above

1938. Which of the following gases has the highest calorific value ________________?
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A. water gas

B. coal gas

C. blast furnace gas

D. coke oven gas

E. producer gas

1939. In an experiment to determine dryness fraction of steam, the mass of water separated was 1.2 kg in 15 mts and the mass of steam passed out in same time was 4.8 kg. Dryness fraction is__________________?
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A. 50%

B. 40%

C. 90%

D. 25%

E. 80%

1940. Steam engine operates on_________________?
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A. Stirling cycle

B. none of the above

C. joule cycle

D. carnot cycle

E. brayton cycle

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