Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

EM2 > EM2 > Flashcards

EM2 Flashcards

1
Q

A_______oscilloscope has two vertical inputs

A

Dual Trace

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

An Ideal transformer what is the relatiosnship between the output power and the input power?

A

Power out would be equal to power in.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

The core with the highest permeability is?

A

soft iron

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is the one hand rule when working on electronic equipment ?

A

keeping one hand free will minimize the possibility of creating a low resistance path to ground through your body/

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What do you adjust on an osciliscope to determine the number of waves displayed?

A

Time per division

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

_____is the term for the combination of reactance and resistance that restrict the flow of alternating current>

A

impendence

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

if you use a x10 probe instead of direct x1 probe on an oscilloscope, what effect does it have on the circuit test?

A

it decreases circuit loading

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

which of the following function is not a common use for an inductor?

A

boosting low level signals

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What are the main functions of a transformer ?

A

isolation/coupling step up/down

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Which of the following function is not the common use of a capacitor ?

A

Radiating a signal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

______is known as the time it takes to charge a capacitor to 63 percent.

A

time constant

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

the positive peak of a sine wave corresponds to

A

90 degrees

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

what factors effect the velocity propagation factor of a coax cable

A

dielectric constant and permeability

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

One megahertz is defined as one_____per second

A

million cycles

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

the ammeter function on a multimeeter is used to measure which of the following ?

A

current

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Which of the following controls adjust the amplitude size of the waveforms on the screen?

A

vertical sensitivity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

what has a 50 ohms impendence

A

RG 58

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

1x10with a little 9 next to the 10

A

Giga

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

what voltage is applied across each branch in a parallel RC circuit

A

total circuit voltage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

what is the period of a one hertz waveform?

A

1 second

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

______is term used to refer to an inductor

A

coil

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

What is the time it takes to produce a cycle of a waveform?

A

period

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

For low resistance measurement, test leads resistance should be compensated by?

A

shortening the test leads , finding their resistance and then subtracting that from the measurement.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

Which widening of a transformer is normally connected to the output voltage?

A

secondary

25
Q

inductance varies as the _____of the number of turns

A

square

26
Q

unused leads in a transformer should be

A

insulated from each other

27
Q

When an AC voltage source is supplied across a capacitor the current flow within the circuit will be at a minimum when the sine voltage is at its________

A

Peak value

28
Q

Unless re identified with electrical tape the color ____should not be used for the hot wire in a standard 120 v wall outlet circuit.

A

white

29
Q

The four types of transformer are

A

power, rf and audio, isolation

30
Q

In a resonant circuit, capacitance equals inductance

A

false

31
Q

self inductance is the process by which the changing magnetic field around a conductor induces positive electromotive in the conductor itself

A

false

32
Q

In an iron core or transformer what is the purpose of insulated lamination?

A

reduces power wasting edgy currents

33
Q

The voltage rating of a capacitor _______

A

relates to the maximum voltage that should be applied to it

34
Q

Even if not connected to a circuit , should a large capacitor be considered dangerous?

A

all large capacitors are potentially dangerous

35
Q

what is the phase relationship in a resistive capacitive circuit where the vector line relationship two lines perpendicular to each other?

A

90 degree difference

36
Q

in a _______circuit voltage leads current

A

inductive

37
Q

A burning microwave oven is the example of a _____fire

A

class c

38
Q

In a capacitive circuit what is the phase relationship of voltage and current ?

A

current leads

39
Q

Frequency has what unit of measurement?

A

hertz

40
Q

On an osciliscope which control do you use to adgjust the top to a bottom location of a waveform displayed on the screen?

A

vertical position

41
Q

An alternating current is a sinusoidal with a positive and negative alternation t/f?

A

true

42
Q

In a parallel rc circuit the phase relationship between voltage and current is?

A

90 degrees in the capacitive branch and in phase of the restrictive branch

43
Q

When measuring current the meter should always be?

A

connected in series with the load

44
Q

Balanced signal wiring is done

A

to reduce the circuits vulnerability to external interference

45
Q

the impendence for rg58 coax cable is

A

50 ohms

46
Q

as the distance between the plates of a capacitor decreases the capacitance value ______

A

increases

47
Q

a capacitor is made up of _____

A

two plates seperated by a dielectric

48
Q

when the current goes positive at the same time that the voltage producing it goes negative the current is said to be______

A

out of phase

49
Q

current leads or lags voltage when an ac voltage is applied across a capacitor

A

leads

50
Q

The y axis’s of an oscilloscope is used to measure

A

amplitude

51
Q

What is the fourth harmonic of 15 khz?

A

60KHZ

52
Q

The inductive reactance ______an inductor if the frequency of the applied voltage is doubled .

A

is twice the previous value

53
Q

a resonant circuit with a narrow bandwidth is considered to have a_______

A

high q

54
Q

Which of the following events would cause an inductive flyback transient to occur

A

switch contacts in a highly inductive circuit open

55
Q

The capacitance reaction will________when the frequency of an applied voltage is increased.

A

decrease

56
Q

______is dependant on material and dimension used in the design of each type of coax cables

A

characteristic impendance

57
Q

when a current level of 0.1 amps from arm to arm in the average adult it would likely result in _____

A

a death

58
Q

What is the unit of measure for inductors?

A

henry

59
Q

A sinewave has which of the following characteristics ?

A

sharp rise and fall times in relations to its period

EM2 (1 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions