# Eddy Current Testing CMA 1

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# Eddy Current Testing CMA 1

Q1. The coil in an eddy current probe is usually made from:

• Copper
• Aluminium
• Platinum
• Silver

Q2. The coil self inductance is:

• All of the other options are TRUE.
• Dependent on the coil’s wire length
• Dependent on the relative permeability of the core
• Dependent on its number of turns

Q3. Which of the following describes the voltage across a capacitor?

• The voltage is identical with the current through it
• The voltage lags the current through it by a phase of π/2 radians
• The voltage leads the current through it by a phase of π/2 radians
• The voltage is the inverse of the current through it

Q4. It was not until the end of the twentieth century that eddy current testing showed its true potential as a competitive testing method in the NDT market. This was because:

• All of the other options are TRUE
• Difficulty of the eddy current theory
• There was no general purpose, portable and user-friendly eddy current device
• Other NDT testing methods were available and preferred by professionals

Q5. Eddy currents are generated in a conductor by:

• Direct Current
• Voltage across the conductor
• The interaction of a time varying magnetic field with the conductor
• Resistance of the conductor

Q6. In measuring sinusoidal signals, devices would generally give more reliable measurements if they are set to measure:

• The peak to peak value.
• The root mean square value.
• The peak value.
• The DC offset.

Q7. In which of the following standards you can find information about equipment characteristics and verification in eddy current testing:

• EN 12668
• BS EN 13860
• BS EN 12084
• EN 14127

Q8. When a conductive but non-permeable material is brought in the proximity of a probe, the coil’s inductive reactance will:

• Decrease and then increase
• Decrease
• Remain the same
• Increase

Q9. A sinusoidal waveform has a period of 20 ms. Its frequency is:

• 5 Hz
• 50 Hz
• 500 Hz
• 5 kHz

Q10. In eddy current testing, the higher the frequency of the current used to drive the probe, the:

• More effective shielding will be needed due to skin effect
• Stronger the probe’s magnetic field will be
• Shallower the eddy currents will penetrate
• All of the other options are TRUE

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