midterm 2

Question 1

In which region does a BJT act as an OFF switch in electronic circuits?

Answer 1

Cut-off

Question 2

The state of a BJT where the collector current is at maximum and independent of base current?

Answer 2

Saturation

Question 3

What is the ratio of dc collector current to dc emitter current in a BJT called?

Answer 3

Alpha

Question 4

What is the thin, lightly doped region of a BJT?

Answer 4

Base

Question 5

The process of increasing power, voltage, or current by electronic means?

Answer 5

Amplification

Question 6

A signal type characterized by a continuous set of values?

Answer 6

Analog

Question 7

In a PN junction with no external voltage, the electric field is called?

Answer 7

Barrier

Question 8

What causes the potential barrier in a PN junction?

Answer 8

Fixed donor and acceptor ions

Question 9

What happens to the capacitance of a reverse-biased PN junction as reverse bias increases?

Answer 9

It decreases

Question 10

What is the junction current in an unbiased PN junction at equilibrium?

Answer 10

Zero, as equal but opposite carriers cross the junction

Question 11

What type of device is a diode?

Answer 11

Unidirectional

Question 12

Which region of the diode does the anode correspond to?

Answer 12

P-type

Question 13

What voltage is needed to forward bias a silicon diode?

Answer 13

0.7 V

Question 14

If a 7V battery is connected across a diode with 0.7V forward drop, will the bulb glow?

Answer 14

Yes

Question 15

Applying voltage from cathode to anode is what type of biasing?

Answer 15

Reverse

Question 16

What is the maximum reverse voltage a diode can handle?

Answer 16

Peak Inverse Voltage

Question 17

Which part of the I-V graph represents reverse bias?

Answer 17

Reverse Biased

Question 18

How is the depletion layer in forward bias compared to reverse bias?

Answer 18

Thin

Question 19

How does reverse-biased resistance compare to forward-biased resistance?

Answer 19

Higher in reverse bias

Question 20

What does forward current depend on?

Answer 20

Forward voltage

Question 21

A reverse-biased silicon diode has about 0.7 V across it.

Answer 21

False

Question 22

An atom is the smallest particle of an element that retains its characteristics.

Answer 22

True

Question 23

An intrinsic semiconductor is neither a good conductor nor insulator.

Answer 23

True

Question 24

The ideal model of a diode is a switch.

Answer 24

True

Question 25

A pn structure is called a diode.

Answer 25

True

Question 26

Forward bias allows current through a pn junction.

Answer 26

True

Question 27

An intrinsic crystal contains impurities.

Answer 27

False

Question 28

N-type material has very few free electrons.

Answer 28

False

Question 29

Silicon used in semiconductors is extremely pure.

Answer 29

False

Question 30

The movement of free electrons in semiconductors is called electron voltage.

Answer 30

False