mechanical engineering MCQs – Page 80

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 Review each marked answer and report any item that may be outdated or unclear.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

1581. Surveying tapes are made of a material having low coefficient of expansion and enough strength. The alloy used is__________________?
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A. duralumin

B. invar

C. monel metal

D. silver metal

E. Hastelloy

1582. Dow metal contains____________________?
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A. 90% aluminium and 90% copper

B. 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe

C. 90% magnesium and 9% aluminium with some copper

D. 90% magnesium and 10% tin

E. 92.5% aluminium and, 4% copper, 2% nickel and 1.5% Mg

1583. In compression, a prism of brittle material will break________________?
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A. in direction perpendicular to application of load

B. none of the above

C. by crushing into thousands of pieces

D. by forming a bulge (l>) by shearing along oblique plane

1584. Permalloy is a___________________?
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A. none ferrous alloy

B. cutting tool material

C. kind of stainless steel

D. nickel and iron alloy having high permeability

E. polymer

1585. Pure iron is the structure of_______________?
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A. ferrite and pearlite

B. anstenite

C. ferrite

D. pearlite

E. ferrite and cementite

1586. Which is false statement about tempering. Tempering is done to_______________?
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A. reduce hardness and brittleness

B. improve machinability

C. improve ductility

D. release stresses

E. improve toughness

1587. Muntz metal contains copper and zinc in the ratio of________________?
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A. 50:50:00

B. 40 : 60

C. 80:20:00

D. 0.888888889

E. 60 : 40

1588. Grey cast iron_____________________?
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A. is produced by small additions o magnesium (or cerium) in the ladle Graphite is in nodular or spheroida form and is well dispersed throughout the material

B. none of the above is true

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 am is obtained by cooling rapidly. It i: almost unmachinable

E. is produced by annealing process. I is soft, tough and easily machinec metal

1589. Drop forging dies contain carbon of the order of_________________?
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A. 0.1 to 0.2%

B. 0.25 to 0.5%

C. 1.0 to 1.2%.

D. 0.6 to 0.7%

E. 0.7 to 0.9%

1590. Compressive strength of grey cast iron in tonnes/cm is of the order of___________________?
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A. 15-Oct