Question

Which of the following techniques are NOT applicable for detecting internal flaws in a ceramic
material?
1. Liquid penetration test
2. Radiography
3. Ultrasonic testing
4. Eddy current method
(A) 1 and 3 (B) 3 and 4 (C) 2 and 4 (D) 1 and 4

Answer 1

1. Liquid penetration test

2. Radiography

3. Ultrasonic testing

4. Eddy current method

(A) 1 and 3 (B) 3 and 4 (C) 2 and 4 (D) 1 and 4

ans a

Answer 2

Option (D) 1 and 4 is the answer.  

1. Liquid penetration test is used to detect only surface level defects.
2. Radiography is mostly used to detect cracks inside the material.
3. Ultrasonic waves can penetrate inside materials and hence detect in-depth defects.  
4. Eddy current method is not used to detect flaws in non-conductive materials such as ceramics.

Hope it helps.