Transistors Quiz

Complete the following sentence about semiconductors. N-type semiconductors have ______ electrons available to conduct. P-type semiconductors have a structure where there are absences of ______ in the bonding between atoms.

• additional, electrons

• fewer, protons

• extra, neutrons

• missing, ions

Which statement describes the forward current gain of an NPN transistor?

• The difference between the emitter current and the collector current

• The collector current divided by the base current

• The emitter current divided by the collector current

• The collector current divided by the base current

The circuit diagram shows a transistor-based circuit. What will happen when the toggle switch is moved to connect R1 to the base of the transistor? Choose all the statements that are true.

• Current will flow between the base and emitter of TR1.

• The LED will light.

• A smaller current will flow through R2 than R1.

• The current flowing into the base will equal the current flowing through R2.

The graph shows the relationship between the base current and the base-emitter voltage for an NPN transistor. Match each region on the graph to the mode of operation of the transistor.

• Cut-off region

• Active region

• Saturation region

• Reverse-active region

Two students are discussing the structure of a MOSFET. Student A says that a larger charge on the gate will constrict the conducting channel between drain and source. Student B says that once the gate is charged, no current will flow through it. Who is correct?

• Student A only

• Student B only

• Both students

• Neither student