Chemical Engineering Basics

151. Brazing is the joining of metals

1. Without melting the base metal
2. With a non-ferrous filler
3. Both (A) & (B)
4. Neither (A) nor (B)

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152. Breakeven point represents the condition, when the company runs under no profit no loss condition. In break even analysis, total cost comprises of fixed cost

1. Only
2. Plus variable cost
3. Plus overhead cost
4. Plus selling expenses

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153. Brinell Hardness Number (BHN) for talc is approximately in the range of

1. 43952
2. 20-30
3. 100-150
4. 200-250

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154. Brittleness induced due to the presence of sulphur in steel can be reduced by adding

1. Manganese
2. Magnesium
3. Vanadium
4. Copper

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155. Broaching tools are usually made of

1. Cermets
2. High speed steel
3. Tungsten carbide
4. Stellite

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156. Calorific value of __________ are almost same.

1. Lignite & anthracite coal
2. Lignite & coal gas
3. Petrol & diesel
4. Coal gas & natural gas

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157. Capacity & power requirement for an air compressor working at high altitude compared to sea-level will be

1. More
2. Less
3. Same
4. Either more or less; depends on the climatic conditions

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158. Carbide tipped cutting tools are manufactured by powder metallurgy techniques and have a composition of

1. 90% tungsten carbide and 10% cobalt
2. 70% aluminium oxide & 30% silica
3. 30% nickel, 15% chromium & 55% tungsten
4. 65% tungsten & 35% zirconium

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159. Carbon is present in the form of __________ in grey cast iron.

1. Spheroids
2. Nodular aggregates of graphite
3. Flakes
4. Cementite

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160. Carbon supply in pack carburising process is in the form of

1. Charcoal
2. Calcium carbide
3. Hydrocarbon oil
4. Graphite

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