CET Semiconductor Devices & Circuits 2

Question 1

What is the primary function of a Zener diode in a circuit?

Accepted Answer

Regulate voltage by operating in reverse breakdown

Answer

Amplify AC signals

Answer

Rectify AC to DC

Answer

Store electrical charge

Question 2

In an NPN transistor, which terminal is the source of electrons during normal active-region operation?

Accepted Answer

Emitter

Answer

Collector

Answer

Base

Answer

Substrate

Question 3

A silicon diode has a forward voltage drop of approximately:

Accepted Answer

0.7 V

Answer

0.1 V

Answer

0.3 V

Answer

1.4 V

Question 4

What does the parameter hFE (or β) represent for a BJT transistor?

Accepted Answer

DC current gain (IC/IB)

Answer

Cutoff frequency

Answer

Transconductance in siemens

Answer

Reverse saturation current

Question 5

Which biasing configuration for a BJT provides the most stable Q-point against temperature variations?

Accepted Answer

Voltage-divider bias

Answer

Fixed bias

Answer

Collector-to-base bias

Answer

Emitter bias with dual supply

Question 6

In a MOSFET, the channel conductivity is controlled by the voltage applied to which terminal?

Accepted Answer

Gate

Answer

Drain

Answer

Source

Answer

Body

Question 7

A full-wave bridge rectifier uses how many diodes?

Accepted Answer

4

Answer

1

Answer

2

Answer

6