ISCET Electronic Components & Circuit Analysis 3

Question 1

When a silicon diode is forward biased, the typical voltage drop across it is approximately:

Accepted Answer

0.7 V

Answer

Silicon diodes have a forward voltage drop of approximately 0.7 V, while germanium diodes drop about 0.3 V.

Question 2

In a Wheatstone bridge circuit, the bridge is said to be balanced when:

Accepted Answer

The galvanometer reads zero current

Answer

A Wheatstone bridge is balanced when the ratio R1/R2 = R3/R4, resulting in zero current through the galvanometer.

Question 3

What does the 'Q factor' of a resonant circuit indicate?

Accepted Answer

The ratio of reactance to resistance

Answer

Q factor (quality factor) is the ratio of reactance to resistance, indicating the selectivity and efficiency of a resonant circuit.

Question 4

A full-wave rectifier using a center-tapped transformer produces a ripple frequency of:

Accepted Answer

Twice the input frequency

Answer

A full-wave rectifier produces output pulses during both half-cycles, resulting in a ripple frequency twice the input AC frequency.

Question 5

In a common-collector (emitter follower) amplifier, the voltage gain is approximately:

Accepted Answer

Slightly less than 1

Answer

The emitter follower has a voltage gain just under 1, but provides high current gain and acts as an impedance transformer.

(ISCET) International Society of Certified Electronics Technicians Practice Test