Digital Electronics
The effect of stray magnetic field on the actuating torque of a portable instrument is maximum when the operating field of the instrument and the stray fields are

 Inclined at 60°.
  Parallel.
 Perpendicular.
 Inclined at 30°.

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Digital Electronics
2421 code is

 non-weighted self-complementing code
 weighted non-self-complementing code
 weighted self-complementing code
 non-weighted and non-self-complementing code

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