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    Question

    Ultrasonic pulse echo technique, a non-destructive

    ultrasonic testing, is employed for any possible flaw detection in a metallic bar of thickness 30 cm. If the arrival times of the ultrasonic pulses are 45 us and 90 us respectively, the distance of the flaw from one end of the steel bar at which the ultrasonic pulse initially enters the steel bar, will be:
    A 14 cm Correct Answer Incorrect Answer
    B 15 cm Correct Answer Incorrect Answer
    C 18 cm Correct Answer Incorrect Answer
    D 16 cm Correct Answer Incorrect Answer

    Solution

    The correct answer is B

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