The GATE Grind

GATE 2021 PI – Question 21

Quality and Reliability · Metrology and Inspection · 1 mark · Multiple choice

Match features P:surface-plate flatness error; Q:cam profile; R:machine-tool slideway alignment error; S:screw-thread pitch and angle errors, with instruments 1:autocollimator; 2:toolmaker’s microscope; 3:dividing head and dial gauge; 4:optical interferometer.

  1. P–4,Q–1,R–2,S–3
  2. P–1,Q–3,R–4,S–2
  3. P–2,Q–4,R–3,S–1
  4. P–4,Q–3,R–1,S–2

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Show answer and explanation

Correct answer: (B) P–1,Q–3,R–4,S–2; (D) P–4,Q–3,R–1,S–2

Explanation

Cam profiles can be indexed and checked using a dividing head/dial gauge; thread geometry uses a toolmaker’s microscope. Surface flatness and slideway alignment can be evaluated using optical angular/interference methods in suitable setups. The final official key accepts **B OR D**, preserving both assignments of autocollimator and interferometer. This is alternative-answer MCQ grading, not a requirement to select both.

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