Metallurgical Testing And Inspection - Study Mode

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[#76] Which one of the following NDT techniques cannot be used to detect an internal crack in a steel shaft?

(A) Liquid penetrant inspection

(B) Radiography

(C) Ultrasonic testing

(D) X-ray tomography

Correct Answer

(A) Liquid penetrant inspection

[#77] The ASTM grain size number N for a structural steel which shows 65 grains per square inch at a magnification of 100X is

(A) 1

(B) 3

(C) 5

(D) 7

Correct Answer

(D) 7

[#78] Match those listed in Group 1 with the NDT methods listed in Group 2 . Group 1 Group 2 P. Penetrameter 1. Ultrasonic test Q. Differential coil probe 2. Dye-penetrant test R. Piezo-electric probe 3. X-ray radiography S. Developer 4. Accoustic emission test

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

(B) P-2, Q-1, R-3, S-4

(C) P-1, Q-2, R-4, S-3

(D) P-4, Q-3, R-2, S-1

Correct Answer

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

[#79] A pearlitic steel is observed under an optical microscope which has a numerical aperture (N.A) of 1.5 and uses the radiation of 4500A. The minimum lamellar spacing (in A) which can be resolved using this microscope is

(A) 500

(B) 750

(C) 1000

(D) 1500

Correct Answer

(B) 750

[#80] A common use of ultrasonic testing is

(A) Cleaning

(B) Detecting of sub-surface indications

(C) Determination of the test piece ductility

(D) Communications

Correct Answer

(B) Detecting of sub-surface indications