Chemical Engineering Basics

651. The most suitable material of construction for a sewer to carry sewage under high pressure is

1. Asbestos cement
2. Steel
3. Cement concrete
4. Stoneware

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652. The noble metals

1. Are exemplified by Na, K and Li
2. Do not resist corrosion very strongly
3. Are the lowermost in the electro-chemical series of metals
4. None of these

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653. The normal stress is the same in all directions at a point in a fluid, only when the fluid

1. Is at rest & has zero viscosity
2. Is frictionless
3. Fluid layer has no motion relative to an adjacent layer of fluid
4. is incompressible & frictionless

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654. The only suitable method for hardening the low carbon steel is case hardening. Which of the following is a case hardening process?

1. Cyaniding
2. Sherardizing
3. Spheroidising
4. None of these

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655. The order of a chemical reaction

1. Can be determined only experimentally
2. Can be determined from the stoichiometry of the reaction
3. Cannot be zero
4. Can be fractional

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656. The passage between the nozzle and the __________ is called 'sprue' in case of injection moulding.

1. Runner
2. Cylinder
3. Mold
4. None of these

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657. The phenomenon occurring during explosion of a hydrogen bomb is

1. Nuclear fission
2. Nuclear fusion
3. A combination of both nuclear fission & fusion
4. None of these

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658. The pressure drop per unit length for laminar flow of fluid through a long pipe is proportional to (where, A = cross-sectional area of the pipe & D = Diameter of the pipe)

1. A
2. D
3. 1/A
4. 1/A2

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659. The pressure outside a bubble/droplet of liquid is __________ the internal pressure.

1. Greater than
2. Less than
3. Equal to
4. Unpredictable; depends on the bubble size

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660. The process of removal of scale formed during hot rolling of steel is termed as

1. Descaling
2. Shot blasting
3. Pickling
4. Skimming

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