Transistor (NPN, CE) — Practice Quiz

Question 1

In a BJT operating in active mode:

Accepted Answer

E-B forward, C-B reverse

Answer

Both junctions forward

Answer

Both junctions reverse

Answer

E-B reverse, C-B forward

Question 2

Current gain β of a transistor is 99. Corresponding α:

Accepted Answer

0.99

Answer

0.5

Answer

1.01

Answer

100

Question 3

Common-Emitter amplifier has voltage gain:

Accepted Answer

≈ −g_m R_C (inverting)

Answer

≈ +1

Answer

≈ R_C/R_E

Answer

Always 100

Question 4

BJT used as a switch is in:

Accepted Answer

Cutoff (off) and saturation (on)

Answer

Active region

Answer

Breakdown

Answer

Reverse

Question 5

Emitter is heavily doped because:

Accepted Answer

To inject many carriers into the base efficiently

Answer

To resist heat

Answer

To attract phonons

Answer

To make it conductive