Question Bank • QB_SUB_FP_CMP_001 MCQ • 1 Mark

Section 3: Farm Power

Farm Power

Subtopic: Engine components

Question Statement:

In a multi-cylinder diesel engine cylinder head, the exhaust valve is typically made of austenitic silicon-chromium steel (silchrome) primarily because:

Options:

  • (A) It operates in an intensely corrosive environment at temperatures exceeding 700°C
  • (B) It needs to have lower density than aluminum
  • (C) It acts as an electrical grounding electrode
  • (D) It conducts zero heat away from the combustion chamber

Answer Key:

A

Step-by-Step Solution & Explanation

Exhaust valves endure peak flame temperatures (700–850°C) and corrosive exhaust gas products (SOx, NOx), requiring silchrome or nimonic alloys for high creep and hot-corrosion resistance.
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