Diode I-V Characteristics — Practice Quiz

Question 1

Threshold voltage of a silicon diode is approximately:

Accepted Answer

0.7 V

Answer

0.1 V

Answer

0.3 V

Answer

1.5 V

Question 2

In reverse bias, the diode current is:

Accepted Answer

Small reverse saturation current ~constant

Answer

Zero

Answer

Large and proportional to V

Answer

Exponentially growing

Question 3

Dynamic resistance of a diode at 1 mA forward bias is approximately:

Accepted Answer

26 Ω

Answer

260 Ω

Answer

2.6 Ω

Answer

0.026 Ω

Question 4

Ideal diode I-V curve:

Accepted Answer

Zero current in reverse, vertical line in forward (V = 0)

Answer

Linear through origin

Answer

Vertical step at V_threshold

Answer

Constant current

Question 5

Why does forward current of a diode rise exponentially?

Accepted Answer

Carrier density across the junction grows as exp(eV/kT)

Answer

Ohm's law applies

Answer

Atoms vibrate more

Answer

Magnetic effect