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Engineering Materials

Engineering Materials
Quenching is not necessary when hardening is done by

Any one of these
Nitriding
Flame hardening
Case hardening

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Engineering Materials
A material is known as allotropic or polymorphic if it

Responds to heat treatment
Has a fixed structure under all conditions
Has its atoms distributed in a random pattern
Exists in several crystal forms at different temperatures

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Engineering Materials
If a refractory contains high content of silicon, it means refractory is

Brittle
Acidic
Neutral
Basic

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Engineering Materials
The presence of hydrogen in steel causes

Corrosion resistance
Embrittlement
Improved Weldability
Reduced neutron absorption cross-section

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Engineering Materials
Corrosion resistance of steel is increased by addition of

Chromium and nickel
Sulphur, phosphorus, lead
Vanadium, aluminium
Tungsten, molybdenum, vanadium, chromium

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Engineering Materials
Cemented carbide tools are not found to be suitable for cutting

Steel
Brass
Aluminium
Cast iron

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