Chemical Engineering Basics

551. Steel is welded using the __________ flame.

1. Carburising
2. Neutral
3. Oxidising
4. All (A), (B) & (C)

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552. Steel produced from phosphatic iron is __________ in nature.

1. Malleable
2. Ductile
3. Brittle
4. Tough

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553. Steel rods are normally used for concrete reinforcement because concrete and steel have almost equal

1. Tensile strength
2. Compressive strength
3. Young's modulus
4. Thermal co-efficient of expansion

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554. Steels with high carbon equivalent have poor Weldability, because in these steels during welding

1. Carbon and other alloying elements get oxidised from the weld pool
2. Excessive ferrite forms in the heat affected zone leading to poor toughness of the weld
3. Martensite forms in the heat affected zone leading to poor toughness/ductility of the weld
4. Segregation of carbon and other element occurs in the weld pool leading to poor properties of the weld

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555. Stellite is a __________ material.

1. Ferrous
2. Ceramic
3. Cemented carbide
4. Non-ferrous cast alloy cutting tool

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556. Strain hardening effect in a metal subjected to cold working is due to the __________ mechanism.

1. Fracture
2. Dislocation
3. Slip
4. Twinning

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557. Strain hardening effect in metals subjected to cold working is due to the __________ mechanism.

1. Slip
2. Fracture
3. Winning
4. Dislocation

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558. Stresses encountered in the metal forming processes are less than the __________ of the material.

1. Fracture strength
2. Yield strength
3. Elastic limit
4. Limit of proportionality

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559. Sub zero treatment of steel is done to

1. Suppress martensite transformation
2. Enhance its working performance in sub zero atmosphere
3. Reduce the retained austenite in hardened steel
4. Induce temper brittleness after its hardening

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560. Sudden fall of atmospheric pressure by a large amount is an indication of the

1. Rain
2. Cold wave
3. Storm
4. Fair weather

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