Engineering Materials
JKSSB Junior Engineer (Mechanical) · Material Science & Production Engineering · 19 practice questions with answers and explanations: 4 Easy, 15 Medium, 0 Hard.
Sample questions
Sample Easy question 1
Quenching of heated steel in water or oil makes it:
- Lighter
- Soft and ductile
- Hard and brittle
- Magnetic
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Answer: C. Rapid cooling forms martensite.
Sample Easy question 2
Steel is an alloy of iron and:
- Zinc
- Carbon
- Copper
- Aluminium
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Answer: B. Plain carbon steel has up to about 2% carbon.
Sample Easy question 3
Cast iron has a carbon content of about:
- 0.8%
- 2% to 4%
- 0.1% to 0.3%
- Below 0.02%
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Answer: B. Higher carbon makes it hard and brittle.
Sample Medium question 4
Which of these is a thermosetting plastic?
- PVC
- Bakelite
- Nylon
- Polythene
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Answer: B. Thermosetting plastics cannot be softened again by heating.
Sample Medium question 5
Which material is best for a bearing lining (babbitt)?
- Cast iron
- Brass
- Tin-based white metal
- Mild steel
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Answer: C. It has low friction and embeds dirt particles.
Sample Medium question 6
Duralumin is an alloy mainly of:
- Iron with carbon
- Copper with zinc
- Aluminium with copper
- Lead with tin
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Answer: C. It is used in aircraft because of its high strength-to-weight ratio.