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The portable instrument used for measuring ultrasonic pulse velocity through concrete with a digital output is known as:
Answer & Solution
Correct answer: A.
1. Ultrasonic pulse velocity is measured by sending a pulse from one transducer through concrete and timing its arrival.
2. The standard portable digital instrument is the Portable Ultrasonic Non-destructive Digital Indicating Tester (PUNDIT).
3. It weighs no more than 3 kg, with a timing accuracy of 0.1 microsecond.
4. The Schmidt hammer and Vee-Bee consistometer are unrelated devices for rebound and workability.
5. Pulvex is not a recognised tester.
_Source: IGNOU ET-522 Concrete Technology, Block 2 Unit 9 "Testing of Concrete"._
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