If a diode shows equal resistance but not zero in both directions then the diode must be ____.

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RRB ALP CBT 2 Electronic Mechanic Previous Paper: Held on 23 Jan 2019 Shift 1
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  1. short 
  2. defective
  3. working fine
  4. open

Answer (Detailed Solution Below)

Option 2 : defective
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  • In practice, no diode is an Ideal diode, this means neither it acts as a perfect conductor when forward biased nor it acts as an insulator when it is reverse biased.
  • The opposition offered by a diode to the current flowing forward bias condition is known as its forward resistance.
  • The forward resistance is measured by taking the ratio of DC voltage across the diode to the DC current flowing through it.
  • The value of the forward resistance of a diode is very small, ranging from 1 to 25 Ohms.
  • Under the Reverse biased condition, the opposition offered by the diode to the reverse current is known as Ideally, the reverse resistance of a diode is considered to be infinite.

F2 Neha Madhu 29.10.20 D2

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