Test 1

Question 0

Impedance opposes ___ and ___ of ____ field.

Answer 0

Strength, charge, electric field.

Question 1

2 field we’re interested in for audio.

Answer 1

Electric & Magnetic

Question 2

Inductance opposes change in ___ and ___ of ___ field.

Answer 2

Strength, polarity, magnetic

Question 3

Magnetic Field

Answer 3

Inductance

Question 4

Electric Field

Answer 4

Capacitance

Question 5

Speed at which electricity travels in a wire is called. What % of the speed of light.

Answer 5

Propagation Velocity, 70%

Question 6

For a cable to be electrically short it must be ___, or less, of the maximum frequency of interest. If it is, it’s not ___

Answer 6

10%, Transmission Line

Question 7

Why was grounding originally created.

Answer 7

Prevent death by lightning strokes, and industrial created static charge.

Question 8

Grnd connected to the earth via a low resistance path.

Answer 8

Earth Grnd

Question 9

What ground protects against lightning strikes.

Answer 9

Earth Grnd

Question 10

Ground that prevents electrocution due to potentially faulty electronics in a device.

Answer 10

Safety (Fault) Ground.

Question 11

Grounding scheme used for frequencies below 1 MHz.

Answer 11

Single Point (Star) Grounding.

Question 12

Grounding scheme used for frequencies above 1 MHz.

Answer 12

Multipoint (Mesh) Grounding.

Question 13

Grounding scheme used for frequencies above & below 1 MHz with equal effectiveness.

Answer 13

Frequency selective transmission (hybrid) grounding.

Question 14

There should always be a shield grounding at the driven end of the cable whether or not the end connected to a receiving device is balanced or not. T or F

Answer 14

True.

Question 15

3 basic types of grounding.

Answer 15

Earth, safety, and signal grounding.

Question 16

Impedance is the ___ effect of both resistance & reactance of circuits that contain inductance, capacitance, and resistance.

Answer 16

Combined.

Question 17

There’s a predictable amount of noise generated by all devices. T or F

Answer 17

True.

Question 18

Name of measured amount of noise in each device.

Answer 18

Inherent Noise.

Question 19

Inherent noise connect in signal path from two separate devices add. T or F.

Answer 19

True.

Question 20

Noise can or cannot be removed from original signal without altering it.

Answer 20

Can’t.

Question 21

Inductance is denoted ___

Answer 21

L

Question 22

Field that neither moves nor changes direction is ____.

Answer 22

Static.

Question 23

If one type of field moves or fluctuates in space the other type of field is generated. T or F

Answer 23

True.

Question 24

___ ___ is the movement of electrons.

Answer 24

Current flow.

Question 25

For current to flow it must leave and return to a source. T or F

Answer 25

True.

Question 26

EMF ___ ___ ___ is commonly know as ___ and is denoted _

Answer 26

Electro Motive Force, Voltage, V

Question 27

Current if commonly denoted _ for ___

Answer 27

I, intensity.

Question 28

Unit of measurement for current.

Answer 28

Amps. A

Question 29

Resistance is denoted _. Measure in ___ denoted___.

Answer 29

R, ohms, omega.

Question 30

Electrostatic field exists between any 2 conductors that have a ___ between them.

Answer 30

Voltage.

Question 31

Anything that transfers electricity.

Answer 31

Conductor.

Question 32

Capacitance is the property that tends to oppose change in the ___ or ___ of the ___ static field.

Answer 32

Strength, charge, electrico

Question 33

Capacitance is denoted _ unit of measurement ___ denoted _.

Answer 33

C, Farads, F

Question 34

Inductance is denoted _. Measured in ___ denoted _.

Answer 34

L, Henry's, H

Question 35

Impedance is denoted _. Measured in ___.

Answer 35

Z, ohms

Question 36

All real world circuits contain ___ ___ ___ ___.

Answer 36

Capacitance, inductance, resistance, and impedance.

Question 37

SCIN. Type of cable that has the least SCIN?

Answer 37

Shield Current Induced Noise. Braided shields

Question 38

Devices called ground isolators solve what two problems.

Answer 38

Ground loop and common Z problems.

Question 39

A transformer fits or doesn't fit the definition of a ground isolator?

Answer 39

Fits.

Question 40

Twisting of conductors in a balanced line pair values their their resistance to magnetic field. T or F

Answer 40

True.

Question 41

An interface consists of ___ ____ ___

Answer 41

Driver -> line -> receiver.

Question 42

Any voltage that's the same on both conductors of a single circuit is said to be ___ of both circuits.

Answer 42

Common

Question 43

A balanced circuits rejecting what kind of noise?

Answer 43

Common mode noise

Question 44

Differential circuit is a balanced circuit which gives us ___

Answer 44

Differential gain & common mode gain

Question 45

CMRR is the ratio of ___?

Answer 45

Differential gain to the common mode gain

Question 46

Inductive coupling results when any conductor cuts the ___ lines of force.

Answer 46

Magnetic

Question 47

When a conductor cuts a magnetic line of force, what is generated through inductance?

Answer 47

Voltage

Question 48

Real world CMRR would contrast significantly from spec sheets. T or F

Answer 48

True

Question 49

A concise definition of a balance circuit is?

Answer 49

A 2 conductor circuit with a shield.

Question 50

All circuits connected to conductors must have the same ___

Answer 50

Impedance.

Question 51

The purpose of balancing is to make noise pick up equal in ___ conductors?

Answer 51

Both, in which case it can be a common mode signal.

Question 52

A differential devices will reject what voltage.

Answer 52

Common mode.

Question 53

2 signals are said to have ___ when they have equal magnitude but opposite polarity.

Answer 53

Symmetry.

Question 54

What advantage does signal symmetry give us?

Answer 54

Increases our output level.

Question 55

Noise cancelation comes from ___ signals?

Answer 55

Common Mode.

Question 56

Symmetrical signals give us ___ signal?

Answer 56

Differential.