Engineering Materials

JKSSB Junior Engineer (Mechanical) · Technical Subjects (Mechanical) · 16 practice questions with answers and explanations: 4 Easy, 12 Medium, 0 Hard.

Sample questions

Sample Easy question 1

Quenching of heated steel in water or oil makes it:

  1. Lighter
  2. Soft and ductile
  3. Hard and brittle
  4. Magnetic
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Answer: C. Rapid cooling forms martensite.

Sample Easy question 2

Steel is an alloy of iron and:

  1. Zinc
  2. Carbon
  3. Copper
  4. 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:

  1. 0.8%
  2. 2% to 4%
  3. 0.1% to 0.3%
  4. Below 0.02%
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Answer: B. Higher carbon makes it hard and brittle.

Sample Medium question 4

Stainless steel contains chromium of at least about:

  1. 1%
  2. 50%
  3. 10.5%
  4. 30%
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Answer: C. Chromium forms a protective oxide layer.

Sample Medium question 5

Tempering is done after hardening to:

  1. Add carbon
  2. Melt the steel
  3. Reduce brittleness and relieve stress
  4. Increase hardness
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Answer: C. It reheats steel to a moderate temperature.

Sample Medium question 6

Case hardening produces a hard outer layer and:

  1. A brittle core
  2. A hard core
  3. No change in core
  4. A soft, tough core
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Answer: D. Carburising adds carbon to the surface.

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