CET CET Analog Electronics and Amplifiers

Question 1

What is the voltage gain of a common-emitter amplifier with a collector resistance of 1 kΩ and emitter resistance of 100 Ω (emitter unbypassed)?

Accepted Answer

10

Answer

0.1

Answer

100

Answer

1000

Question 2

Which BJT amplifier configuration provides both voltage gain and current gain while inverting the output signal?

Accepted Answer

Common-emitter

Answer

Common-base

Answer

Common-collector

Answer

Emitter-follower

Question 3

What is the primary purpose of a bypass capacitor placed in parallel with the emitter resistor in an amplifier?

Accepted Answer

Increase AC voltage gain by shorting the emitter resistor at signal frequencies

Answer

Block DC bias current

Answer

Increase input impedance

Answer

Reduce power supply noise

Question 4

In a differential amplifier, what does a high Common-Mode Rejection Ratio (CMRR) indicate?

Accepted Answer

The amplifier effectively rejects signals common to both inputs

Answer

The amplifier has high voltage gain

Answer

The amplifier has wide bandwidth

Answer

The amplifier has low noise figure

Question 5

What is the ideal input impedance of an operational amplifier?

Accepted Answer

Infinite

Answer

Zero

Answer

50 Ω

Answer

600 Ω

Question 6

Which amplifier class operates with the transistor conducting for less than 180° of the input cycle, improving efficiency at the cost of high distortion?

Accepted Answer

Class C

Answer

Class A

Answer

Class B

Answer

Class AB