mechanical engineering MCQs – Page 137

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 Review each marked answer and report any item that may be outdated or unclear.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

2721. Killed steels are those steels__________________?
0

A. which are deoxidised in the ladle with silicon and aluminium

B. which have poor properties due to improper manufacturing

C. which after their destruction are recycled to produce fresh steel

D. in which carbon is completely burnt

E. which are destroyed by burning

2722. Phosphor bronze contains____________________?
0

A. 1% phosphorous

B. none of the above

C. 0.5% of phosphorous

D. 2.5% phosphorous

E. 5% phosphorous

2723. Brass (alloy of copper and zinc) is an example of__________________?
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A. all of the above

B. interstitial solid solution

C. intermetallic compounds

D. none of the above

E. substitutional solid solution

2724. Which is the false statement about wrought iron. It has________________?
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A. uniform strength in all directions

B. high ductility

C. easily weldable characteristics

D. high resistance to rusting and corrosion

E. ability of hold protective coating

2725. Which is false statement about case hardening. Case hardening is done by_______________?
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A. electroplating

B. cyaniding

C. flame hardening

D. nitriding

E. induction hardening

2726. The composition of silver solder is ___________________?
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A. silver, copper, zinc

B. silver, copper, aluminium

C. silver, tin, nickel

D. silver, lead, zinc

E. silver, lead, tin

2727. Which of the following is not the correct method of increasing fatigue limit __________________?
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A. shot peening

B. nitriding of surface

C. cold working

D. under-stressing

E. surface decarburisation

2728. In compression, a prism of brittle material will break________________?
0

A. in direction perpendicular to application of load

B. by crushing into thousands of pieces

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

D. none of the above

2729. Cupola produces following material__________________?
0

A. malleable iron

B. pig iron

C. wrought iron

D. cast iron

E. white iron

2730. Cobalt in steel __________________?
0

A. none of the above

B. improves cutting ability and reduce hardenability

C. improves wear resistance, cuttinability and toughness

D. gives ductility, toughness, tensile strength and anti corrosion property:

E. refines grain size and produces les tendency to carburisation, improve corrosion and heat resistant proper ties

2731. Ductility of a material can be defined as__________________?
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A. ability to undergo large permanent deformations in compression

B. ability to undergo large permanent deformations in tension

C. none of the above

D. all of the above

E. ability to recover its original form

2732. Cemented carbide tools are not found to be suitable for cutting_______________?
0

A. cast iron

B. aluminium

C. brass

D. non-ferrous alloys.

E. steel

2733. Eutectoid steel contains following percentage of carbon_______________?
0

A. 0.8%

B. 0.30%

C. 1.2%.

D. 0.02%

E. 0.63%

2734. Sulphur in pig iron tends to make it___________________?
0

A. soft

B. ductile

C. hard

D. malleable

E. tough

2735. Monel metal contains_________________?
0

A. none of the above

B. 88% copper and 10% tin and rest zinc

C. alloy of tin, lead and cadmium

D. malleable iron and zinc

E. 63 to 67% nickel and 30% copper

2736. Addition of copper to aluminium results in_____________________?
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A. improvement of casting characteristics

B. one of the best known age and precipitation-hardening systems

C. none of the above

D. improving machinability

E. improvement of corrosion resistance

2737. Recrystallization temperature is one________________?
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A. at which crystals first start forming from molten metal when it is cooled

B. at which change of allotropic form takes place

C. at which new spherical crystals first begin to form from the old deformed one when a strained metal is heated

D. at which crystals are destroyed on heating

E. at which crystals grow bigger in size

2738. In which of the following cases, consideration of creep is important_________________?
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A. flywheel of steam engine

B. gas turbine blades

C. cast iron pipes

D. piston I.C. engine

E. cycle chains

2739. Admiralty gun metal contains__________________?
0

A. alloy of tin, lead and cadmium

B. 63 to 67% nickel and 30% copper

C. none of the above

D. 88% copper, 10% tin and rest zinc

E. iron scrap and zinc

2740. German silver is an alloy of___________________?
0

A. silver and gold

B. nickel, copper and zinc

C. nickel and copper

D. refined silver

E. silver and some impurities

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