Deck 29: Diodes and Diode Applications

Question 1

The ______________ resistance is the resistance of the p and n materials.

Answer 1

bulk

Question 2

In the diode prefix 1N, the 1 indicates one ______________.

Answer 2

junction

Question 3

______________ ratings are maximum ratings and should never be exceeded.

Answer 3

Breakdown

Question 4

A circuit that converts the ac power-line voltage to the required dc value is called a ______________ supply.

Question 5

Diodes are able to produce a dc output voltage because they are ______________ devices.

Question 6

The ______________ value of a full-wave signal is equal to 0.707 times the peak voltage.

Question 7

The unfiltered output from a half-wave or full-wave rectifier is a ______________ dc voltage.

Question 8

When elements such as gallium or arsenic are used in doping, a ______________-emitting diode can be manufactured.

Question 9

Voltage regulation is the most common application of a ______________ diode.

Question 10

______________ conduct less than metal conductors but more than insulators.

Question 11

What includes the variations between two successive points having the same value and varying in the same direction?

A) Fluctuating dc
B) Oscillations
C) Cycle
D) Wavetrap

Question 12

A circuit that provides an entirely positive or negative output voltage when an ac input voltage is applied is called a

A) rectifier
B) inverter
C) filter capacitor
D) zener diode

Question 13

The rms value of a full-wave signal is equal to

A) V_p/0.707
B) 0.707 x V_p
C) 1.414 x V_p
D) 0.637 x V_p

Question 14

The maximum instantaneous reverse-bias voltage across a diode is the

A) reverse breakdown voltage
B) reverse bias
C) peak reverse bias
D) peak inverse voltage

Question 15

Which of the following is not an advantage for using a bridge rectifier rather than a two-diode full-wave rectifier?

A) Smaller
B) Lighter
C) More efficient design
D) Costs less

Question 16

The unfiltered output from a half-wave or full-wave rectifier is a(n)

A) ac voltage
B) steady dc voltage
C) pulsating dc voltage
D) sine wave

Question 17

Why does the full-wave rectifier provide a larger dc output voltage with less ripple than a half-wave rectifier?

A) The discharge time for a half-wave is only one-half that of a full-wave
B) The discharge time for a full-wave is only one-half that of a half-wave
C) The charge time for a full-wave is twice that of the half-wave
D) The charge time for a half-wave is twice that of the full-wave

Question 18

What diodes are doped with elements such as gallium, arsenic, and phosphorus and emit different colors of light?

A) LEDs
B) Photoconductors
C) Photoresistors
D) Photocells

Question 19

In most cases, the LED voltage drop can be assumed to be

A) 1 V
B) 1.414 V
C) 2 V
D) 3.414 V

Question 20

Which of the following is not an advantage of an LED over an incandescent lamp?

A) Lower operating voltage
B) Longer life
C) Less expensive
D) Faster on-off switching

Question 21

What diode is optimized for operation in the breakdown region and is often used as a voltage regulator?

A) Silicon rectifier
B) Light-emitting
C) Zener
D) Tunnel

Question 22

Semiconductors with other atoms mixed in are called

A) intrinsic semiconductors
B) extrinsic semiconductors
C) pure semiconductors
D) covalent semiconductors

Question 23

The process of adding impurity atoms is called

A) covalent bonding
B) doping
C) biasing
D) rectifying

Question 24

The sharing of valence electrons is called

A) covalent bonding
B) doping
C) biasing
D) rectifying

Question 25

An atom that has five valence electrons is a

A) pentavalent atom
B) trivalent atom
C) zener atom
D) carbon atom

Question 26

The absence of a valence electron in a covalent bond structure is a(n)

A) atom
B) electron
C) hole
D) dope

Question 27

A small amount of current mainly due to minority carriers in both sections of a diode is called

A) breakdown current
B) avalanche current
C) forward current
D) leakage current

Question 28

The effect that causes a sharp increase in reverse current when the reverse-bias voltage across a diode becomes excessive is called

A) doping
B) reverse bias
C) zener voltage
D) avalanche

Question 29

When using an ohmmeter to check a semiconductor diode, the resistance should be

A) low in both directions
B) high in both directions
C) high in one direction and low in the other
D) zero in one direction and 100 ? in the other

Question 30

Which approximation treats a forward-biased diode like an ideal diode in series with a battery?

A) First
B) Second
C) Third
D) Fourth

Question 31

The most basic semiconductor device is the diode, a device that allows current to pass through it in only one direction.

Question 32

One of the most useful applications of a semiconductor diode is converting dc voltage into ac voltage.

Question 33

The semiconductor element carbon is mainly used in the production of diodes.

Question 34

Intrinsic semiconductors are semiconductors in their purest form.

Question 35

The sharing of valence electrons is called covalent bonding.

Question 36

A popular semiconductor device called a diode is made by joining p- and n-type semiconductor materials.

Question 37

A colored band near one end of an actual diode is used to indicate the anode lead.

Question 38

A reverse-biased diode conducts a small amount of current, called leakage current.

Question 39

Avalanche is the effect that causes a sharp increase in reverse current when the reverse-bias voltage across the diode becomes excessive.

Question 40

A graph of forward voltage versus forward current shows that a diode is a nonlinear device.

Question 41

The condition of a semiconductor diode cannot be determined with an ohmmeter.

Question 42

The first approximation treats a forward-biased diode like a closed switch with a voltage drop of zero volts.

Question 43

The part number for a diode will always begin with the prefix 1N.

Question 44

A circuit that converts the ac power-line voltage to the required dc value is called a power supply.