HAM HAM Radio Extra Class Test Practical Electronics Circuits Questions and Answers 2

Question 1

What is the primary purpose of a bleeder resistor in a power supply circuit?

Accepted Answer

To discharge filter capacitors when the supply is turned off

Answer

To increase the output voltage under load

Answer

To regulate the current flowing to the load

Answer

To filter out AC ripple from the DC output

Question 2

In a Class AB amplifier, what advantage does it offer over a Class B amplifier?

Accepted Answer

Reduced crossover distortion

Answer

Higher power efficiency

Answer

Greater voltage gain

Answer

Lower component count

Question 3

What is the function of a bypass capacitor placed across the emitter resistor in a common-emitter amplifier?

Accepted Answer

To increase AC voltage gain by shorting the emitter resistor at signal frequencies

Answer

To stabilize the DC bias point of the transistor

Answer

To filter out power supply noise from the circuit

Answer

To prevent thermal runaway of the transistor

Question 4

Which component in a voltage regulator circuit provides the reference voltage for comparison?

Accepted Answer

A zener diode

Answer

A coupling capacitor

Answer

An RF choke

Answer

A varactor diode

Question 5

What happens to the Q factor of a parallel resonant circuit if the resistance in the circuit increases?

Accepted Answer

The Q factor decreases

Answer

The Q factor increases

Answer

The Q factor remains unchanged

Answer

The resonant frequency shifts higher

Question 6

What type of filter topology uses both series inductors and shunt capacitors to achieve a sharp cutoff response?

Accepted Answer

A pi-network low-pass filter

Answer

A simple RC high-pass filter

Answer

A single-pole Butterworth filter

Answer

A resistive T-network attenuator