Chemical Engineering Basics

661. The product (s) of roasting of a sulphide ore is (are)

1. Oxide only
2. Sulphate only
3. Oxide and sulphate
4. Dependent on temperature and partial pressure of oxygen & sulphur dioxide

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662. The product of a commercial direct reduction process is

1. Liquid iron
2. Solid iron
3. Sponge iron
4. Iron saturated with carbon

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663. The product out from a cupola is called

1. Wrought iron
2. Pig iron
3. Cast iron
4. None of these

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664. The property of material, by which a given amount of energy is absorbed by it without plastic deformation, is called the

1. Resilience
2. Toughness
3. Ductility
4. Impact strength

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665. Thermodynamic cycle involved in the working of a thermal power plant is the __________ cycle.

1. Joule
2. Carnot
3. Rankine
4. Brayton

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666. The ratio of mass of a neutron to that of an electron is about 1839. What is the ratio of the mass of a proton to that of an electron?

1. 159
2. 1837
3. 2537
4. 10000

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667. The ratio of the shear stress to the principal stress on a principal plane is

1. 0
2. 1
3. 43862
4. 43891

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668. The ratio of thermal & electrical conductivity is same for all the metals at the same temperature; and at around room temperature, this ratio is proportional to(where, T = absolute temperature, °K)

1. T
2. 1/T
3. T²
4. 1/T²

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669. The refractory brick which has good thermal shock resistance at high temperature but cracks on cooling below 400°C is

1. Magnesite
2. Chrome
3. Silica
4. Fireclay

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670. The refractory lining of the bottom in a basic electric arc furnace is made of

1. Silica
2. Alumina
3. Magnesia
4. Fireclay

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