mechanical engineering MCQs – Page 91

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 Review each marked answer and report any item that may be outdated or unclear.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

1801. A one dimensional flow is one which_________________?
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A. takes place in straight lines

B. involves zero transverse component of flow

C. is steady uniform flow

D. is uniform flow

E. takes place in one dimension

1802. Differential monometer is used to measure___________________?
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A. atmospheric pressure

B. velocity in pipes

C. difference of pressure between two points

D. pressure in pipes, channels etc.

E. very low pressure

1803. Which of the following alloys does not have copper as one of the constituents________________?
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A. delta metal

B. monel metal

C. nichrome

D. constantan

E. silicon bronze

1804. If the surface of liquid is convex, men ___________________?
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A. cohesion pressure is increased

B. cohesion pressure is negligible

C. cohesion pressure is decreased

D. none of the above

E. there is no cohesion pressure

1805. Tensile strength of steel can be safely in-creased by________________?
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A. adding small quantities of copper

B. adding copper and carbon

C. adding carbon up to 6.3%

D. adding carbon up to 2.8%

E. adding carbon up to 0.83%

1806. The time oscillation of a floating body with increase in metacentric height will be_________________?
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A. lower

B. higher

C. same

D. unpredictable

E. lower/higher depending on weight of body

1807. White cast iron__________________?
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A. is produced by annealing process. It is soft, tough and easily machined metal

B. is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material

C. contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron

D. is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

E. none of the above

1808. Aluminium bronze contains aluminium and copper in the ratio of___________________?
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A. 90:10:00

B. 40 : 60

C. 10 : 90

D. 50:50:00

E. 60:40:00

1809. Steel made from phosphatic iron is_________________?
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A. hard

B. malleable

C. tough

D. ductile

E. brittle

1810. Admiralty brass used for steam condenser tubes contains copper and zinc in the following ratio_________________?
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A. 30 : 70

B. 50:50:00

C. 40 : 60

D. 70:30:00

E. 60:40:00

1811. Recrystallisation temperature can belowered by_________________?
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A. working at lower temperature

B. grain refinement

C. none of the above

D. all of the above

E. purification of metal

1812. Austenite rs a combination of_________________?
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A. ferrite and austenite

B. ferrite and iron graphite

C. cementite and gamma iron

D. pearlite and ferrite

E. ferrite and cementite

1813. Malleable cast iron _________________?
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A. is produced by small additions of magnesium (or cerium) in the ladle. Graphite is in the nodular or spheroidal form and is well dispersed throughout the material

B. is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

C. is produced by annealing process. It is soft, tough, and easily machined metal

D. contains l.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron

E. none of the above

1814. Wrought iron is________________?
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A. heat treated to change its properties

B. high in strength

C. hard

D. least resistant to corrosion

E. highly resistant to corrosion

1815. Non uniform flow occurs when_________________?
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A. the direction and magnitude of the velocity at all points are identical