(Hint - Reading in DMM is Over Range) a. A Good Diode b. An Open Diode c. Open D

Question

(Hint - Reading in DMM is Over Range)

a.   A Good Diode

b.    An Open Diode

c.     Open DMM Probe

d.    Both b & c

Which parameter of diode dictates AC voltage-blocking capability of diode?

a.    PIV (Peak Inverse Voltage / Peak Reverse Voltage)

b.    VF   (Forward Voltage Drop)

c.    Maximum DC blocking voltage

d.    Both a & c

If DC current in the diode network shown in figure 2 is 100mA which of the diode should we use? (Hint – See datasheet in References)

a.    1N4007

b.    1N34A

c.    Anyone can be used

d. None of the above

Forward DC current carrying capacity of diode:

a.    Increases with increasing temperature

b.    Decreases with increasing temperature

c.    Decreases with decreasing temperature

d.    Temperature has no effect on diode’s forward current carrying capacity.

If junction temperature of a diode increases, forward voltage drop of the diode:

a.    Increases

b.    Decreases

c.    Decreases if operated within its operating temperature range and fused if exceeds.

d.    Remains stable

Explanation / Answer

Solutions:

1) If we are measuring resistance between the diode in forward bias and reverse bias conditions, high resistance indicates that the diode is open-circuited.

So Option is (b).

2) Diode AC voltage blocking capability depends on the PIV (peak inversion voltage which determines the negative peak value that the diode must be able to operate without break down.

So Option is (a).

3) If diode has forward bias current of 100mA, then the load voltage at 2.2K resistor is 220V which is not feasible.

If diode has reverse bias current of 100mA, then the voltage at 2.2K resistor is 220V which is not feasible.

So Option is (d).

4) Forward DC current carrying capability of the diode is increased with increase in temperature.

So Option is (a).

5) If junction temperature of a diode increases, forward voltage drop of the diode decrease because the band gap is reduced with temperature.

So Option is (b).

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