ISCET Semiconductor Devices Questions and Answers

Question 1

A technician is building a simple voltage regulator circuit.
Which semiconductor device is specifically designed to operate in the reverse breakdown region to maintain a constant voltage across its terminals?

Accepted Answer

Zener Diode

Answer

Signal Diode

Answer

Schottky Diode

Answer

Varactor Diode

Question 2

A technician needs to control a high-power AC load, such as a motor, using a low-power DC signal. Which three-terminal semiconductor device is most suitable for this application, acting as a latching switch?

Accepted Answer

Silicon-Controlled Rectifier (SCR)

Answer

Bipolar Junction Transistor (BJT)

Answer

Zener Diode

Answer

Field-Effect Transistor (FET)

Question 3

When comparing a Bipolar Junction Transistor (BJT) to a Field-Effect Transistor (FET), which of the following is a key characteristic of the FET?

Accepted Answer

High input impedance

Answer

Low input impedance

Answer

Current-controlled device

Answer

Constructed with two P-N junctions

Question 4

A technician is testing a standard silicon PN junction diode out of circuit using a digital multimeter's diode test function. What approximate voltage reading should the technician expect when the diode is forward-biased?

Accepted Answer

0.7 V

Answer

0.3 V

Answer

1.2 V

Answer

0.0 V

Question 5

In a semiconductor material, the process of intentionally adding impurities to increase its conductivity is known as:

Accepted Answer

Doping

Answer

Refining

Answer

Ionization

Answer

Annealing

Question 6

A technician is troubleshooting a circuit and suspects a transistor has failed. A visual inspection of the NPN BJT reveals a small crack in its casing and a slight burnt smell. This type of damage is most often caused by:

Accepted Answer

Excessive collector current or overheating

Answer

Electrostatic discharge (ESD)

Answer

Reverse polarity on the base-emitter junction

Answer

Insufficient base current