| 1. | Steel containing upto 0.15% carbon, is known as ? | |
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mild steel
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dead mild steel
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medium carbon steel
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high carbon steel
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Report Question| 2. | Which of the following impurity in cast iron makes it hard and brittle ? | |
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Silicon
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Sulphur
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Manganese
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Phosphorus
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| 3. | Specify the sequence correctly ? | |
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Grain growth, recrystallisation, stress relief
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Stress relief, grain growth, recrystallisation
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Stress relief, recrystallisation, grain growth
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Grain growth, stress relief, recrystallisation
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| 4. | In a unit cell of a body centred cubic space lattice, there are .................. atoms ? | |
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six
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nine
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fourteen
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seventeen
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| 5. | For a steel containing 0.8% carbon ? | |
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there is no critical point
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there is only one critical point
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there are two critical points
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there can be any number of critical points
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| 6. | An alloy steel which is work hardenable and which is used to make the blades of bulldozers, bucket wheel excavators and other carth moving equipment contain iron, carbon and ? | |
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chromium
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silicon
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manganese
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magnesium
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| 7. | In the austempering process of heat treatment, austenite changes into ? | |
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martensite
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troostite
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sorbite
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bainite
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| 8. | A steel alloy containing 36% nickel is called ? | |
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stainless steel
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high speed steel
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invar
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heat resisting steel
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| 9. | The coordination number of a face centred cubic space lattice is ? | |
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six
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twelve
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eighteen
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twenty
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| 10. | The steel widely used for motor car crankshafts is ? | |
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nickel steel
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chrome steel
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nickel-chrome steel
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silicon steel
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