1

Question 2

What type of crystal lattice is found in silicon and germanium?

Answer 2

face centered cubic (fcc)

Question 3

What is the energy gap between the valence band and conduction band of a semiconductor?

Answer 3

one electron volt (1 eV)

Question 4

What is the typical range of the resistivity of a semiconductor?

Answer 4

10 - 10^4 Ω-cm

Question 5

What type of chemical bond is significant in metals?

Answer 5

metallic bonding

Question 6

What do you call a semiconductor that is doped with both donor and acceptor impurities?

Answer 6

compensated semiconductor

Question 7

What is the current flow in a semiconductor due to the applied electric field called?

Answer 7

drift current

Question 8

What is the movement of charge carriers in a semiconductor without the application of electric potential called?

Answer 8

diffusion current

Question 9

For high-speed integrated circuits, which semiconductor material is best to use?

Answer 9

gallium arsenide

Question 10

How much impurity concentration is needed for silicon to change its electrical property from a poor conductor to a good conductor?

Answer 10

one part per million

Question 11

Which semiconductor has the highest heat conductivity and is used as a heat sink?

Answer 11

diamond

Question 12

What is the voltage across the gate-source terminal of a FET that causes drain current ID to equal zero?

Answer 12

pinch-off voltage

Question 13

What is the insulator used in most MOSFETs?

Answer 13

SiO2

Question 14

According to Shockley’s equation of a JFET, what is the drain current when VGS equals the pinch-off voltage VP?

Answer 14

zero

Question 15

What is the amount of voltage needed at the gate-source terminal for an enhancement type MOSFET to form a channel for current flow?

Answer 15

threshold voltage

Question 16

What is the process of growing a thin oxide film on a planar semiconductor device to protect junctions from contamination called?

Answer 16

passivation

Question 17

If the base-emitter junction is reverse biased and the base-collector junction is forward biased, what region of operation is the transistor in?

Answer 17

cut-off region

Question 18

What hybrid parameter is usually neglected in most circuit analysis?

Answer 18

hr and ho

Question 19

What type of compound is GaAs?

Answer 19

Compound

Question 20

What is a CMOS integrated circuit susceptible to?

Answer 20

damage by static

Question 21

How is a semiconductor material made into N type?

Answer 21

By adding a donor impurity

Question 22

Why do holes flow the opposite way from electrons?

Answer 22

Charge carriers are passed from atom to atom

Question 23

What three-terminal IC regulator has a variable negative voltage output?

Answer 23

337

Question 24

How do we protect active devices in switching regulators from large over-currents and over-voltages?

Answer 24

by installing a snubber circuit

Question 25

In a complex control system, what postulates the necessary compensating networks and cross-coupling networks?

Answer 25

compensating network

Question 26

What is the simplest converter used in motor phase control?

Answer 26

half-wave converter

Question 27

What term indicates current gain in a common-collector configuration?

Answer 27

Gamma

Question 28

What is a T flip-flop primarily used for?

Answer 28

To divide the input frequency by two

Question 29

How is line regulation determined?

Answer 29

by changes in output voltage and input voltage

Question 30

How is load regulation determined?

Answer 30

by changes in load current & output voltage

Question 31

In a differentiator, what is the feedback element?

Answer 31

resistor

Question 32

What type of feedback do Wien-bridge oscillators use?

Answer 32

positive feedback

Question 33

What is another name for memory?

Answer 33

primary storage

Question 34

What are common forms of output units?

Answer 34

Printers and screens

Question 35

What is the period of an AC wave?

Answer 35

Equal to 1 divided by the frequency

Question 36

What can magnetic flux always be attributed to?

Answer 36

Motion of charged particles

Question 37

How can the useful current delivered by a solar panel be increased?

Answer 37

By connecting two or more groups of solar cells in parallel

Question 38

What is an advantage of a rheostat over a potentiometer?

Answer 38

A rheostat can handle more current

Question 39

What is the force between two electrically charged objects called?

Answer 39

Electrostatic force

Question 40

How can the capacitance between the primary and secondary windings of a transformer be minimized?

Answer 40

By placing the windings on opposite sides of a toroidal core

Question 41

Who invented the battery?

Answer 41

Alessandro Volta

Question 42

For what is Charles Babbage (1792-1871) remembered?

Answer 42

Computers

Question 43

Who invented the electric generator?

Answer 43

Michael Faraday

Question 44

In which decade was the transistor invented?

Answer 44

1940s

Question 45

Who invented Bakelite?

Answer 45

Leo Hendrik Baekeland