Chemical Engineering Basics

531. Silicon percentage in the silicon steel used for electrical appliances/equipments is

1. 0.3-0.4
2. 41974
3. 43924
4. 20-25

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532. Softening of hardened steel is done by its

1. Normalising
2. Tempering
3. Annealing
4. Carburising

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533. Solidification time of a molten metal in a casting is proportional to (where, V = volume of metal & A = its surface area; in the casting)

1. V/A
2. V/A2
3. V2/A
4. V2/A2

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534. Solute atoms which cause yield point phenomenon in mild steel are/is

1. Aluminium
2. Boron
3. Carbon
4. Nitrogen

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535. Spark plug is provided in a/an

1. Engine having carburettor
2. Diesel engine
3. Compression ignition engine
4. Both (B) & (C)

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536. Specific __________ is a dimensionless quantity.

1. Heat
2. Humidity
3. Weight
4. None of these

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537. Specific gravity of a metal, which weighs 5 kg in air and 4 kg when submerged in water, will be

1. 5
2. 1.25
3. 2.5
4. 3.75

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538. Specific gravity of hot metal (pig iron) is __________ times that of the blast furnace slag.

1. 2
2. 3
3. 0.8
4. 6

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539. Speed of a submarine in deep sea & that of an aeroplane is measured by a/an

1. Pitot tube
2. Hot wire anemometer
3. Rotameter
4. Stroboscope

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540. Speisses is a mixture of the following:

1. Arsenides of heavy metals
2. Antimonides of heavy metals
3. Arsenides & antimonides of heavy metals
4. Iron, cobalt and nickel

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