Q. In frequency modulation technique cracks below bolt holes are not detected.

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Q. What is the frequency prescribed for the need based concept of the ultrasonic testing?

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Q. Which of the following can be used for testing of long railway tracks?

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Q. An OBS(E) designation represents a defect ______

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Q. What type of defect is OBS defect?

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Q. What does IMR stand for in the classification of Rail flaws?

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Q. How is the echo arising due to fault determined using pulse echo system?

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Q. Which of the following techniques is used by Indian railways for ultrasonic testing?

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Q. Which probe is suitable for detecting horizontal and inclined flaws?

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Q. Crystal transducers are used for ________

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Q. How defects are identified using ultrasonic waves?

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Q. What is the minimum frequency of ultrasonic waves?

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Q. What is another name of Ultrasonic rail flaw detection technique?

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Q. How can rail flaws be detected?

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Q. Rails having visual or ultrasonic detection should be sent for metallurgical investigations.

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Q. Which digit is used to tell that the failure in the rail section has started from within the rail head?

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Q. What does the first digit of the second portion of the code represent?

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Q. What does the third letter represent in the First portion of the code used for classification of rail failures?

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Q. What is the reason for withdrawal of rail if letter ‘C’ is used in code?

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Q. Which letter is used for points and crossing rails in the code used for classification of rail failures?

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