Chemical Engineering Basics

171. Ceramic compounds as compared to metallic compounds

1. Crystallise faster
2. Resist greater tensile stress at room temperature
3. Have higher melting temperature
4. Are better conductor of electricity at higher temperature

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172. Change in volume of metals from absolute zero temperature to their melting points is

1. Almost same for all metals
2. Different for different metals
3. Less for low melting point metals
4. Less for high melting point metals

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173. Chlorine acts as a bleaching agent only in the presence of

1. Dry air
2. Pure oxygen
3. Moisture
4. Sunlight

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174. Chromium molybdenum steel cannot be welded using __________ welding.

1. Thermit
2. Electrical resistance
3. Oxy-acetylene
4. Any of these

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175. Circular cross section machine parts which are symmetrical about the axis of rotation are made by hot

1. Piercing
2. Spinning
3. Drawing
4. Extrusion

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176. Closeness of packing is maximum in case of __________ crystal lattice.

1. Face centred
2. Simple cubic
3. Body centred
4. None of these

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177. Coarse grained steels have

1. Low toughness
2. No tendency to distort
3. High density
4. Very high toughness

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178. Coating provided on the electrodes used in the arc welding is not expected to

1. Add alloying elements
2. Prevent electrode from contamination
3. Stabilise the arc
4. Provide protective atmosphere to weld

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179. Coating thickness in case of galvanising of steel sheet generally corresponds to the deposition of __________ gms of zinc per m² of steel strip.

1. 44109
2. 1000-1500
3. 120-500
4. 1500-3000

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180. Cobalt - 60 is used as a source of __________ in medical therapy & industrial radiography.

1. X-rays
2. γ-rays
3. α-rays
4. β-rays

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