Chemical Engineering Basics

461. Out of the following, the joint produced by __________ has the lowest strength.

1. Soldering
2. Welding
3. Brazing
4. Riveting

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462. Out of the following, the lowest packing of atoms exists in __________ crystal lattice structure.

1. Hexagonal close, packed (hcp)
2. Face centred cubic (fcc)
3. Body centred cubic (bcc)
4. Simple cubic

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463. Out of the following, the most malleable material is

1. Copper
2. Aluminium
3. Wrought iron
4. Lead

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464. Out of the following, which will fracture most readity, when hit with a hard hammer?

1. Brass
2. Bronze
3. German silver
4. Cast iron

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465. Oxide layer formed on the non-ferrous metal surface after its annealing is

1. Removed by acid pickling
2. Hammered into the surface
3. Removed with coarse emery cloth
4. Left as such to protect the surface

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466. Oxyacetylene reducing flame is used while carrying out welding on

1. Alloy steel
2. Grey cast iron
3. Mild steel
4. High carbon steel

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467. Oxygen cylinders used for autogenous (cutting/welding) purposes are

1. Seamless & made of steel
2. Heat treated before use
3. Made by sand casting
4. Welded steel cylinders

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468. Parallel straight line pattern of temperature distribution for both hot and cold fluids is observed in case of heat exchanger of the type

1. Parallel flow with equal heat capacities
2. Counter flow with equal heat capacities
3. Counter flow with unequal heat capacities
4. Parallel flow with unequal heat capacities

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469. Particle nature of cathode rays is proved due to the fact that they

1. Travel in a straight line
2. Get deflected by magnetic electric field
3. Produce fluorescence
4. Heat the exposed material

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470. Pearlite comprises of

1. 87% cementite & 13% Fe
2. 87% ferrite & 13% cementite
3. 93.33% ferrite & 6.67% C
4. 87% ferrite & 13% C

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