mechanical engineering MCQs – Page 94

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 Review each marked answer and report any item that may be outdated or unclear.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

1861. The specific heat of superheated steam in kcal/kg is generally of the order of___________________?
0

A. 0.8

B. 0.3

C. 0.1

D. 1

E. 0.5

1862. The flow in which each liquid particle has a definite path and their paths do not cross each other is called__________________?
0

A. streamline flow

B. turbulent flow

C. one dimensional flow

D. uniform flow

E. steady flow

1863. The upper surface of a weir over which water flows is known is_____________________?
0

A. crest

B. sill

C. contracta

D. weir top

E. nappe

1864. In forced recirculation type boiler__________________?
0

A. heating of water takes place in stages

B. heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum

C. water is supplied in drum and through down-comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam

D. water is converted into steam in one pass without any recirculation

E. feed pump is employed to supplement natural circulation in water wall type furnace

1865. An odd shaped body weighing 7.5 kg and occupying 0.01 m3 volume will be completely submerged in a fluid having specific gravity of__________________?
0

A. 1.25

B. 0.8

C. 1

D. 1.2

E. 0.75

1866. For water, at pressures below atmospheric___________________?
0

A. melting point drops slightly and boiling point drops slightly

B. melting point rises slightly and boiling point drops markedly

C. none of the above

D. melting point rises markedly and boiling point drops markedly

E. melting point drops slightly and boiling point drops markedly

1867. In regenerative air preheater, the heat is transferred _____________________?
0

A. none of the above

B. by direct mixing

C. from heating an intermediateanaterial and then heating the air from this material

D. from a metal wall from one medium to another

E. heat is transferred by bleeding some gas from furnace

1868. The two important forces for a floating body are__________________?
0

A. gravity, pressure

B. inertial, gravity

C. buoyancy, gravity

D. buoyancy, inertial

E. buoyancy, pressure

1869. Mach number is significant in_____________________?
0

A. none of the above

B. simultaneous motion through two fluids where there is a surface of dis-continuity, gravity force, and wave making effects, as with ships hulls

C. supersonics, as with projectiles and jet propulsion

D. all of fhe above

E. full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.

1870. Alcohol is used in manometer, because____________________?
0

A. it provides suitable meniscus for the inclined tube

B. it provides longer length for a given pressure difference

C. its density is less

D. it provides accurate readings

E. its vapour pressure is low

1871. At which pressure the properties of water and steam become identical_________________?
0

A. 0.1 kg/cm2

B. 225.6 kg/cm2

C. 100 kg/cm2

D. it is never possible

E. 1 kg/cm2

1872. True one-dimensional flow occurs when_________________?
0

A. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

B. the magnitude and direction of the velocity do not change from point to point in the fluid

C. the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time

D. the direction and magnitude of the veiocity at all points are identical

E. velocity, depth, pressure etc. change from point to point in the fluid flow

1873. The bituminous coal is non-caking if its carbon content is_______________?
0

A. 90-95%

B. 85-90%

C. 95-100%.

D. 81-85%

E. 78-81%

1874. The diameter of fire tube of Cornish boiler compared to its shell is__________________?
0

A. one half

B. one third

C. two-fifth

D. three-fifth

E. one-fifth

1875. Proximate analysis of fuel is determination of percentage of ____________________?
0

A. lower calorific value

B. rough analysis

C. fixed carbon, ash, volatile matter, moisture

D. higher calorific value

E. carbon, hydrogen, nitrogen, sulphur, moisture

1876. Duplex feed pumps are used in small steam boilers. These operate on the principle of_________________?
0

A. reciprocating pump

B. centrifugal pump

C. ejector pump

D. gear pump

E. axial flow pump

1877. The pressure of reheat steam after passing through reheater compared to inlet condition is _________________?
0

A. equal

B. may be more or less depending on capacity of reheater

C. less

D. more

E. none of the above

1878. The total energy of each particle at various places in the case of perfect incompres sible fluid flowing in continuous sream__________________?
0

A. keeps on decreasing

B. unpredictable

C. remains constant

D. may increase/decrease

E. keeps on increasing

1879. The specific volume of steam with increase in pressure decreases_____________________?
0

A. inversely

B. rapidly first and then slowly

C. slowly first and then rapidly

D. none of the above

E. linearly

1880. Mechanical equivalent of heat for 1 kcal or Joules equivalent is equal to_________________?
0

A. 539 kgm

B. 421 kgm

C. 102 kgm

D. 421 kgm

E. 75 kgm

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