Chemical Engineering Basics

711. To counteract the bad effects of strain hardening on a cold formed part, it must be

1. Tempered
2. Normalised
3. Annealed
4. Hardened

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712. To improve the machinability of steel, it is generally subjected to

1. Spheroidising
2. Tempering
3. Normalising
4. Annealing

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713. Transformation range for ferrous material is the temperature interval during which __________ is formed during its heating.

1. Cementite
2. Austenite
3. Martensite
4. Pearlite

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714. Transformer cores are normally made from

1. Soft ferrites
2. High purity iron
3. Grain oriented Fe-Si alloy
4. Al-Ni-Co alloy

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715. Transition from laminar flow to turbulent flow in fluid flow through a pipe does not depend upon the

1. Length of the pipe
2. Diameter of the pipe
3. Density of the fluid
4. Velocity of the fluid

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716. Transition from laminar to turbulent zone in free convection heat transfer is governed by the critical value of

1. Grashoff number
2. Grashoff number & Reynolds number
3. Reynolds number
4. Grashoff number & Prandtl number

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717. Triple point of water is

1. 0°F
2. 492°R
3. 0°K
4. -273°C

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718. Tumbling is the process of improving the __________ of the materials/parts.

1. Surface finish
2. Fatigue limit
3. Creep limit
4. Surface cleanliness

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719. Two solutions A1 & A2 have pH value of 2 & 6 respectively. It implies that the solution

1. A1 is more alkaline than solution A2
2. A1 is highly acidic
3. A2 is very slightly acidic
4. Both (B) & (C)

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720. Two wires of the same radius & material having length in the ratio of 1 : 2 are stretched by the same force. The strain produced in the two wires will be in the ratio of

1. 1 : 1
2. 1 : 2
3. 2 : 1
4. 1 : 4

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