Chemical Engineering Basics

811. Which of the following metals is the most prone to work hardening?

1. Brass
2. Aluminium
3. Copper
4. Lead

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812. Which of the following metals reacts violently with water?

1. Mercury
2. Sodium
3. Calcium
4. Magnesium

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813. Which of the following pairs is not correctly matched?

1. Uranium - 233 : Fertile material
2. Binding energy : Mass defect
3. Scattering: Absorption cross-section
4. Number of nucleons : Mass number

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814. Which of the following parameters is not responsible for the heat loss from a hot steam carrying bare pipe surface located in a room without fans?

1. Emissivity of pipe surface
2. Diameter & length of the pipe
3. Temperature of hot pipe surface & that of air in the room
4. None of these

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815. Which of the following performance characteristics of a S.I engine is not affected by the front end volatility of the petrol used?

1. Vapour locking
2. Hot starting
3. Spark plug fouling
4. All 'a', 'b' & 'c'

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816. Which of the following phenomenon will exhibit the minimum heat transfer?

1. Boiling
2. Forced convection in air
3. Free convection in air
4. Conduction in air

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817. Which of the following phenomenon/ phenomena is/are diffusion controlled?

1. Dislocation climb
2. Cross-slip
3. Twinning
4. Recrystallisation

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818. Which of the following processes follows the hardening process for reducing the hardening strains & increasing the toughness of the steel part?

1. Anodising
2. Tempering
3. Carburising
4. Annealing

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819. Which of the following properties of a solid is not dependent on crystal imperfection?

1. Ductility
2. Semi-conductivity
3. Melting point
4. Yield stress

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820. Which of the following rays has the least wavelength?

1. Ultraviolet rays
2. Infrared rays
3. Cosmic rays
4. X-rays

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