Mechanical Engineering MCQs

Page No. 37

Nodular iron has____________________?


ahigh maehinability

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blow melting point

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chigh tensile strength

✖


dall of the above

✓


View Answer all of the above

The hardness of steel increases if it contains____________________?


aaustenite

✖


bmartensite

✓


cpearlite

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dcementite

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View Answer martensite

Cobalt in steel __________________?


aimproves wear resistance, cuttinability and toughness

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brefines grain size and produces les tendency to carburisation, improve corrosion and heat resistant proper ties

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cimproves cutting ability and reduce hardenability

✓


dgives ductility, toughness, tensile strength and anti corrosion property:

✖



Tensile strength of steel can be safely in-creased by________________?


aadding carbon up to 2.8%

✖


badding carbon up to 6.3%

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cadding carbon up to 0.83%

✓


dadding small quantities of copper

✖



Connecting rod is usually made of_________________?


aaluminium

✖


blow carbon steel

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cmedium carbon steel

✓


dhigh carbon steel

✖


View Answer medium carbon steel

Tungsten in high speed steel provides________________?


ahot hardness

✓


btoughness

✖


cwear resistance

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dsharp cutting edge

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View Answer hot hardness

Sulphur in steel________________?


aacts as deoxidiser

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breduces the grain size

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cdecreases tensile strength and hardness

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dlowers the toughness and transverse ductility

✓



The ultimate tensile strength of low carbon steel by working at a high strain rate will_________________?


adecrease

✖


bincrease

✓


cremain constant

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dfirst increase and then decrease

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View Answer increase

Ductility of a material can be defined as__________________?


aability to undergo large permanent deformations in compression

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bability to recover its original form

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cability to undergo large permanent deformations in tension

✓


dall of the above

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In compression, a prism of brittle material will break________________?


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

✓


bin direction perpendicular to application of load

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cby crushing into thousands of pieces

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dnone of the above

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