What is the working principle of the pulse echo flaw detector?
C
Reflection of ultrasonic waves
Analysis & Theory
Pulse echo flaw detection works by sending ultrasonic pulses and analyzing the echoes reflected from internal flaws.
Which type of wave is used in a pulse echo flaw detector?
Analysis & Theory
Ultrasonic waves are used to detect internal cracks or voids in materials.
In pulse echo method, what indicates the presence of a flaw?
Analysis & Theory
An intermediate echo before the expected back-wall echo suggests the presence of a flaw.
Which component generates ultrasonic pulses in the detector?
Analysis & Theory
Piezoelectric crystals convert electrical energy into ultrasonic pulses and vice versa.
Which medium is often used to ensure transmission of ultrasonic waves into the test object?
C
Water or gel (coupling medium)
Analysis & Theory
A coupling medium like water or gel is used to minimize reflection at the surface and improve wave transmission.
What kind of flaws can pulse echo testing detect?
B
Internal cracks, voids, and delaminations
Analysis & Theory
The pulse echo method is effective for detecting internal defects like cracks or voids.
What is the function of the display unit in a pulse echo system?
B
Shows visual representation of echoes
Analysis & Theory
The display shows echo signals, helping in identifying flaw positions.
Which of the following is a key advantage of pulse echo flaw detection?
A
Non-destructive testing
Analysis & Theory
Pulse echo flaw detection is a non-destructive method, meaning it doesn't harm the test material.
What type of materials can be tested using pulse echo method?
D
Both metals and non-metals
Analysis & Theory
The pulse echo method is versatile and can be used for both metallic and non-metallic materials.
Why is accurate timing important in pulse echo testing?
A
To regulate temperature
Analysis & Theory
Accurate timing between transmission and echo helps in calculating the depth of flaws.