mechanical engineering MCQs – Page 98

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 Review each marked answer and report any item that may be outdated or unclear.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

1941. The diameters of fire tubes and superheaer tubes in locomotive boiler are_________________?
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A. 32.5 mm, 180 mm

B. 65.5 mm, 210 mm

C. 24.5 mm, 65 mm

D. 47.5 mm, 130 mm

1942. A wet vapour can be completely specified by__________________?
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A. pressure only

B. pressure and dryness fraction

C. temperature only

D. dryness fraction only

E. specific volume only

1943. The fusible plug in small boilers is located ________________?
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A. at the inlet of chimney

B. in the fire tubes

C. above steam dome

D. over the combustion chamber

E. in the drum

1944. The difference of pressure between the inside and outside of a liquid drop is _______________?
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A. p = Txr

B. p = 2T/r

C. p = T/2r

D. p = T/r

E. none of the above

1945. Which type of boiler can meet rapid changes of load____________________?
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A. vertical water tube type

B. forced circulation type

C. horizontal water tube type

D. horizontal fire tube type

E. vertical fire tube type

1946. The flow which neglects changes in a transverse direction is known as_________________?
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A. streamline flow

B. uniform flow

C. one dimensional flow

D. steady flow

E. turbulent flow

1947. The bulk modulus of elasticity___________________?
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A. has the dimensions of 1/pressure

B. is independent of pressure and viscosity

C. increases with pressure

D. is large when fluid is more compressible

E. is directly proportional to flow

1948. The function of injector used in small steam plants is to________________?
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A. dose chemicals in feed water

B. control steam temperature by injecting water

C. create vacuum at turbine exhaust

D. pump feed water

E. create vacuum in furnace

1949. Heating value of fuel used is as on fired basis. If it is reported for dry or moisture free fuel, then latter should be multiplied by the following factor to correct for as fired value ___________________?
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A. (1- moisture content)

B. 1 + moisture content

C. 1 moisture content

D. (1 + moisture content)

1950. Select the correct statement?
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A. Standard atmospheric pressure is the mean local atmospheric pressure a* sea level

B. Gauge piessure is equal to atmospheric pressure plus instrument reading

C. Local atmospheric pressure depends upon elevation of locality only

D. Local atmospheric pressure is always below standard atmospheric pressure

E. A barometer reads the difference be-tween local and standard atmospheric pressure

1951. 100% efficiency of a thermal cycle cannot be achieved because of __________________?
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A. none of the above

B. non-availability of ideal substance

C. it is not possible to achieve 0K temperature

D. frictional losses

E. leakage

1952. The diameter of internal flue tubes in a Lancashire boiler compared to its shell is_________________?
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A. one-fourth

B. two-fifth

C. one-half

D. one-fifth

E. one-third

1953. A fusible plug is fitted in small boilers in order to ___________________?
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A. control steam dome

B. remove molten aslj

C. avoid excessive build up of pressure

D. extinguish fire if water level in the boiler falls below alarming limit

E. avoid explosion

1954. Thermal efficiency of well maintained boiler will be of the order___________________?
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A. 40%

B. 20%

C. 90%

D. 50%

E. 75%

1955. The property of a fluid which enables it to resist tensile stress is known as___________________?
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A. viscosity

B. compressibility

C. adhesion

D. cohesion

E. surface tension

1956. Center of pressure on an inclined plane is___________________?
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A. below the centroid

B. at the centroid

C. at center of pressure

D. at metacentre

E. above the centroid

1957. Pulverized fuel is used for___________________?
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A. medium sized units

B. less radiation loss

C. better burning

D. stoker fired boilers

E. more calorific value

1958. Heating of dry steam above saturation temperature is known as_____________________?
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A. supersaturation

B. enthalpy

C. super tempering

D. superheating

E. latent heat

1959. 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. first increases and then decreases

C. decreases

D. increases

E. remains unaffected

1960. The dry saturated steam at very high pressure (150-200 kg/cm2) when throttled to atmosphere will become_______________?
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A. dry

B. none of the above

C. wet

D. remain dry saturated

E. superheated

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