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BHEL Engineer Trainee Engineering Materials — practice by topic

Browse 3 questions across 3 Engineering Materials topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Engineering Materials topics

Composites (3)Matrix (3)Reinforcement (3)

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Polymer Matrix Composites (PMCs) and Carbon-Carbon Composites are both subcategories of:Read the answer and worked solution →Sandwich structures (honeycomb core between two facesheets) are an example of which composite category?Read the answer and worked solution →Concrete (cement matrix + aggregate stones) is an example of which composite category?Read the answer and worked solution →

Worked practice questions

Polymer Matrix Composites (PMCs) and Carbon-Carbon Composites are both subcategories of:

  1. Ceramic Matrix Composites
  2. Hybrid Composites
  3. Metal Matrix Composites
  4. Organic Matrix Composites
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Correct answer: D. Organic Matrix Composites

OMC encompasses both PMC (polymer matrix, e.g. epoxy + glass fiber) and Carbon-Carbon Composites (carbon matrix + carbon fiber, used in spacecraft heat shields).

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Sandwich structures (honeycomb core between two facesheets) are an example of which composite category?

  1. Whisker composite
  2. Laminar (laminate) composite
  3. Particulate composite
  4. Fibrous composite
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Correct answer: B. Laminar (laminate) composite

Laminar composites consist of layers of materials held together by a matrix or adhesive. Sandwich panels (lightweight core + stiff facesheets) are the canonical example. Common in aerospace skin panels.

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Concrete (cement matrix + aggregate stones) is an example of which composite category?

  1. Laminar composite
  2. Cermet
  3. Fiber-reinforced composite
  4. Particulate composite
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Correct answer: D. Particulate composite

Particles (aggregate stones, sand grains) embedded in a matrix (cement paste) make concrete a PARTICULATE composite. Reinforced concrete adds steel rebar (fiber phase) — making it a hybrid.

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