The GATE Grind

GATE 2026 MT – Question 39

Manufacturing Processes · Non-destructive testing · 2 marks · Multiple choice

Match the descriptions in Column I with the corresponding nondestructive testing methods in Column II.

Column I:

(P) Internal flaws in railroad wheel

(Q) In-service monitoring of crack

(R) Inclusion in mild steel

(S) Surface crack in Al-based alloy

Column II:

(1) Ultrasonic

(2) Radiography

(3) Dye penetrant

(4) Acoustic emission

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

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Correct answer: (A) P-1, Q-4, R-2, S-3

Explanation

Ultrasonics detects internal railroad-wheel discontinuities through echo reflection (P1). Acoustic emission monitors active crack events during service (Q4). Radiography reveals internal inclusions through attenuation contrast (R2). Dye penetrant reveals surface-breaking cracks in nonporous aluminium (S3). Therefore **A**.