Chemical Engineering Basics

701. Thermal equivalent of electrical power in practical calculation is __________ kcal/kWh.

1. 746
2. 3000
3. 1000
4. 550

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702. Thermistors are used in __________ devices.

1. Voltage measuring
2. Temperature measuring
3. Temperature compensating
4. Both (B) & (C)

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703. Thermit welding is categorised as the __________ welding.

1. Forge
2. Fusion
3. Resistance
4. Arc

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704. Thermit welding uses the following energy source.

1. Electrical energy
2. Chemical energy
3. Energy of high velocity electrons
4. Heat generated by friction

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

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

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706. Though tin occurs lower than iron in the electrochemical series, yet it is coated on steel for corrosion protection, because of its

1. Lower cost
2. Abundant availability
3. Resistance to vegetable acids as the tin plate are commercially used in 'canning' industry
4. None of these

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707. Tin based white metals are used, where bearings are subjected to

1. High pressure & load
2. Low pressure & load
3. High temperature
4. Large surface wear

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708. Tip of the match stick contains a mixture of

1. K + S
2. K + S + K₂Cr₂O₇
3. S + K₂Cr₂O₇ + White P
4. None of these

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709. Titanium is added to molten aluminium alloys before casting for the purpose of

1. Grain refinement
2. Increasing corrosion resistance
3. Reducing porosity
4. Improving fluidity

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710. Titanium is produced by __________ of Ti Cl4.

1. Electrolytic reduction
2. Calcium reduction
3. Magnesium reduction
4. Thermal dissociation

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