GROL - General Radiotelephone Operator License Semiconductor and Tube Components Questions and Answers

Question 1

In a bipolar junction transistor (BJT) amplifier circuit, which operating region is characterized by the base-emitter junction being forward-biased and the base-collector junction being reverse-biased?

Accepted Answer

Active region

Answer

Saturation region

Answer

Cutoff region

Answer

Breakdown region

Question 2

What is the primary function of the control grid in a triode vacuum tube?

Accepted Answer

To regulate the flow of electrons from the cathode to the plate.

Answer

To heat the cathode and cause thermionic emission.

Answer

To attract and collect the electrons emitted by the cathode.

Answer

To provide a physical shield against external interference.

Question 3

A technician is designing a simple voltage regulator circuit. To maintain a constant output voltage despite variations in input voltage or load current, which component should be used and how should it be connected?

Accepted Answer

A Zener diode in reverse-bias.

Answer

A signal diode in forward-bias.

Answer

A varactor diode in reverse-bias.

Answer

A light-emitting diode in forward-bias.

Question 4

Which of the following describes the correct biasing for a P-N junction diode to be in a forward-biased condition, allowing significant current to flow?

Accepted Answer

The P-type material is connected to the positive terminal and the N-type material to the negative terminal of the voltage source.

Answer

The P-type material is connected to the negative terminal and the N-type material to the positive terminal of the voltage source.

Answer

No external voltage is applied across the P-N junction.

Answer

Both the P-type and N-type materials are connected to the positive terminal of the voltage source.

Question 5

What is a key difference between a Bipolar Junction Transistor (BJT) and a Field-Effect Transistor (FET)?

Accepted Answer

BJTs are current-controlled devices, while FETs are voltage-controlled devices.

Answer

BJTs are voltage-controlled devices, while FETs are current-controlled devices.

Answer

BJTs have a much higher input impedance than FETs.

Answer

BJTs are unipolar devices, while FETs are bipolar devices.

Question 6

In a common-emitter NPN transistor circuit operating in the saturation region, what are the biasing conditions of the junctions?

Accepted Answer

Both base-emitter and base-collector junctions are forward-biased.

Answer

Base-emitter junction is reverse-biased, base-collector is forward-biased.

Answer

Base-emitter junction is forward-biased, base-collector is reverse-biased.

Answer

Both base-emitter and base-collector junctions are reverse-biased.