CWI NDE Methods and Symbols 2

Question 1

Which NDE symbol on a weld drawing indicates that liquid penetrant testing should be performed?

Accepted Answer

PT

Answer

MT

Answer

UT

Answer

RT

Question 2

In ultrasonic testing, what does the term 'dead zone' refer to?

Accepted Answer

The region near the transducer face where defects cannot be detected

Answer

An area with no acoustic coupling

Answer

A zone where the beam diverges completely

Answer

The area beyond the far field

Question 3

Which type of radiographic film has the finest grain size and highest resolution but requires longer exposure times?

Accepted Answer

Class I (fine grain)

Answer

Class II (medium grain)

Answer

Class III (coarse grain)

Answer

Class IV (ultra-fast)

Question 4

When performing magnetic particle testing, what is the purpose of the 'residual method'?

Accepted Answer

Testing is done after the magnetizing force is removed, relying on retained magnetism

Answer

Testing is done while the magnetizing current is still flowing

Answer

Testing is performed using permanent magnets only

Answer

Testing that uses residual flux from previous welding

Question 5

In liquid penetrant testing, what is the correct sequence of steps?

Accepted Answer

Precleaning → Penetrant application → Dwell time → Excess removal → Developer → Inspection

Answer

Penetrant application → Precleaning → Developer → Inspection → Removal

Answer

Precleaning → Developer → Penetrant application → Inspection

Answer

Penetrant application → Developer → Dwell time → Inspection

Question 6

On a weld NDE symbol, where is the arrow-side designation placed relative to the reference line?

Accepted Answer

Below the reference line

Answer

Above the reference line

Answer

To the left of the tail

Answer

Inside the weld symbol triangle

Question 7

What is the primary advantage of phased array ultrasonic testing (PAUT) over conventional UT?

Accepted Answer

The beam angle and focus can be electronically steered without moving the probe

Answer

It uses X-rays instead of sound waves for better resolution

Answer

It eliminates the need for couplant

Answer

It can detect defects in non-metallic materials only