Chemical Engineering Basics

611. The following type of bonding is strongly directional in solids.

1. Vander Waal's
2. Ionic
3. Metallic
4. Covalent

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612. The friction factor for the turbulent fluid flow in a rough pipe does not depend upon the

1. Pipe roughness & pipe diameter
2. Fluid velocity
3. Type of flowing fluid
4. Both 'b' & 'c'

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613. The fugacity of liquid water at 298 K is approximately 3171 Pa. Considering the ideal heat of vaporisation as 43723 J/gm.mole, its fugacity at 300 K would be

1. 3171P_a
2. 3567P_a
3. 1.01 × 105P_a
4. 5000P_a

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614. The function of neutral flux used in the pyrometallurgy of metal extraction is to increase the __________ of the slag.

1. Fluidity
2. Basicity
3. Acidity
4. Viscosity

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615. The hardenability of steel decreases with

1. Decrease in dislocation density
2. Increase in solutionising temperature
3. Increase in strength
4. Decrease in grain size

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616. The heat of neutralisation remains constant, when there is a reaction between dilute solutions of strong

1. Base and strong acid
2. Base and weak acid
3. Acid and weak base
4. None of these

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617. The heat released by cooling one mole of copper from 400 K to room temperature (300 K) is (assume : C_p of copper is 23 J K^-1mole^-1)

1. 2300 J
2. 4600 J
3. 230 J
4. 2.3 × 10⁶ J

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618. The heat treatment to which the steel wire containing > 0.25% carbon is subjected to is

1. Full annealing
2. Bright annealing
3. Patenting
4. None of these

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619. The highest stress that a material can withstand for a specified length of time without excessive deformation is called the __________ strength.

1. Creep
2. Endurance
3. Fatigue
4. None of these

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620. The joint for soldering is supported by binding wire made of

1. Mild steel
2. Copper
3. Soft iron
4. Stainless steel

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