Viva EDC Cycle 1

The cut-in voltage of a silicon diode is approximately:

• 0.3 V

• 0.5 V

• 0.7 V

• 1.2 V

In forward bias, current through a PN junction diode is:

• Negligible

• Very high

• Zero

• Constant

The VI characteristic of a diode in reverse bias shows:

• Large current

• Small leakage current

• Zero current

• Oscillations

Which diode emits light when forward biased?

• Zener

• LED

• Schottky

• Tunnel

The color of LED depends on:

• Applied voltage

• Bandgap of semiconductor

• Current rating

• Packaging

In CB configuration, input is applied between:

• Base-Collector

• Collector-Emitter

• Emitter-Base

• Base-Emitter

Current gain (α) in CB mode is given by:

• IC / IB

• IC / IE

• IE / IC

• IB / IC

Typical value of α is:

• >1

• 0.1-0.3

• 0.5-0.6

• 0.9-0.99

Input characteristics of CB transistor resemble:

• Diode in forward bias

• Diode in reverse bias

• Resistor

• Zener diode

CB configuration has:

• High Rin, High Rout

• Low Rin, High Rout

• High Rin, Low Rout

• Low Rin, Low Rout