In what application is gallium arsenide used as a semiconductor material?

1. A In high-current rectifier circuits
2. B In high-power audio circuits
3. C In microwave circuits
4. D In very low-frequency RF circuits

Which of the following semiconductor materials contains excess free electrons?

1. A N-type
2. B P-type
3. C Bipolar
4. D Insulated gate

Why does a PN-junction diode not conduct current when reverse biased?

1. A Only P-type semiconductor material can conduct current
2. B Only N-type semiconductor material can conduct current
3. C Holes in P-type material and electrons in the N-type material are separated by the applied voltage, widening the depletion region
4. D Excess holes in P-type material combine with the electrons in N-type material, converting the entire diode into an insulator

What is the name given to an impurity atom that adds holes to a semiconductor crystal structure?

1. A Insulator impurity
2. B N-type impurity
3. C Acceptor impurity
4. D Donor impurity

How does DC input impedance at the gate of a field-effect transistor (FET) compare with that of a bipolar transistor?

1. A They are both low impedance
2. B An FET has lower input impedance
3. C An FET has higher input impedance
4. D They are both high impedance

What is the beta of a bipolar junction transistor?

1. A The frequency at which the current gain is reduced to 0.707
2. B The change in collector current with respect to the change in base current
3. C The breakdown voltage of the base-to-collector junction
4. D The switching speed

Which of the following indicates that a silicon NPN junction transistor is biased on?

1. A Base-to-emitter resistance of approximately 6 ohms to 7 ohms
2. B Base-to-emitter resistance of approximately 0.6 ohms to 0.7 ohms
3. C Base-to-emitter voltage of approximately 6 volts to 7 volts
4. D Base-to-emitter voltage of approximately 0.6 volts to 0.7 volts

What is the term for the frequency at which the grounded-base current gain of a bipolar junction transistor has decreased to 0.7 of the gain obtainable at 1 kHz?

1. A Corner frequency
2. B Alpha rejection frequency
3. C Beta cutoff frequency
4. D Alpha cutoff frequency

What is a depletion-mode field-effect transistor (FET)?

1. A An FET that exhibits a current flow between source and drain when no gate voltage is applied
2. B An FET that has no current flow between source and drain when no gate voltage is applied
3. C An FET that exhibits very high electron mobility due to a lack of holes in the N-type material
4. D An FET for which holes are the majority carriers

In Figure E6-1, which is the schematic symbol for an N-channel dual-gate MOSFET?

1. A 2
2. B 4
3. C 5
4. D 6

In Figure E6-1, which is the schematic symbol for a P-channel junction FET?

1. A 1
2. B 2
3. C 3
4. D 6

What is the purpose of connecting Zener diodes between a MOSFET gate and its source or drain?

1. A To provide a voltage reference for the correct amount of reverse-bias gate voltage
2. B To protect the substrate from excessive voltages
3. C To keep the gate voltage within specifications and prevent the device from overheating
4. D To protect the gate from static damage