Chemical Engineering Basics

571. The 'transition temperature' for ductile to brittle behaviour of steel increases with increase in the __________ content in steel.

1. Carbon
2. Manganese
3. Both 'a' nor 'b'
4. Neither 'a' nor 'b'

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572. The __________ of a double acting reciprocating pump as compared to the single acting pump will be almost double.

1. Flow output
2. Head developed
3. Overall efficiency
4. Weight

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573. The ability of tool steel to resist softening at high temperatures is termed as __________ hardness.

1. Red
2. Extended
3. Super
4. Extreme

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574. The activity co-efficient of the solute in a dilute solution

1. Decreases with the increase of concentration of the solute
2. Increases with the increase of concentration of the solute
3. Remains constant
4. Is unity at infinite dilution

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575. The activity of pure hydrogen gas at 1000°C and 5 atm pressure

1. Is always less than 1
2. Is always greater than 1
3. Can be 5
4. Depends on the choice of the standard state

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576. The Al2O3 content of cryolite in Hall-Heroult cell is maintained between __________ percent.

1. 43953
2. 18-20
3. 42339
4. 44171

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577. The amount of different substances produced, when the same quantity of electricity is passed through different solutions are proportional to their

1. Equivalent weight
2. (Equivalent weight)2
3. Molecular weight
4. (Molecular weight)2

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578. The amount of water evaporated in kg per kg of fuel burnt in a boiler is called the __________ of a boiler.

1. Evaporative capacity
2. Evaporation efficiency
3. Thermal efficiency
4. Steam load

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579. The approximate height of a blast furnace having a useful volume of 2000 m3 is about __________ metres

1. 25
2. 35
3. 55
4. 75

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580. The atmospheric temperature during melting of ice/snow (in the atmosphere)

1. Decreases
2. Increases
3. Remain same
4. May increase or decrease; depends on the altitude where snow melts

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