71. Which of the following statements is/are true for ultrasonic test?
72. Radiographic appearance of inclusions resembles
73. The tensile test of a sheet material exhibits 20% elongation in length and 10% decrease in width. The plastic strain ratio is
74. The best method for determining the average hardness of an aluminium casting is
75. Ultrasonic testing can be used for (choose the correct combination of the following statements P, Q, R, S):
P. Quantitative analysis of phases
Q. Determination of elastic constants
R. Determination of endurance limit
S. Detection of internal defects
P. Quantitative analysis of phases
Q. Determination of elastic constants
R. Determination of endurance limit
S. Detection of internal defects
76. In fracture control design procedures, NDT plays an important role because it primarily enables to
77. Match the following:
Group 1
Group 2
P. Ultrasonic
1. change in accoustic impedence
Q. Radiography
2. change in thermal conductivity
R. Eddy current
3. change in electrical conductivity
S. Magnetic particle
4. change in density
5. change in magnetic flux leakage
Group 1 | Group 2 |
P. Ultrasonic | 1. change in accoustic impedence |
Q. Radiography | 2. change in thermal conductivity |
R. Eddy current | 3. change in electrical conductivity |
S. Magnetic particle | 4. change in density |
5. change in magnetic flux leakage |
78. Match the NDT methods with the type of defects detected.
NDT methods
Type of defects detected
P. Ultrasonic
1. Internal
Q. X-ray
2. Most
R. Eddy current
3. External
S. Liquid penetrant
4. Surface breaking
NDT methods | Type of defects detected |
P. Ultrasonic | 1. Internal |
Q. X-ray | 2. Most |
R. Eddy current | 3. External |
S. Liquid penetrant | 4. Surface breaking |
79. Radiography technique of detecting defects is based on the principle of
80. What is the most common source of penetrant bath contamination
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