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Eddy Current Testing CMA 1

online exam help ukQ1. 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