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EM2 Flashcards

1
Q

A_______oscilloscope has two vertical inputs

A

Dual Trace

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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.

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3
Q

The core with the highest permeability is?

A

soft iron

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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/

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5
Q

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

A

Time per division

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6
Q

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

A

impendence

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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

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8
Q

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

A

boosting low level signals

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9
Q

What are the main functions of a transformer ?

A

isolation/coupling step up/down

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10
Q

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

A

Radiating a signal

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11
Q

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

A

time constant

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12
Q

the positive peak of a sine wave corresponds to

A

90 degrees

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13
Q

what factors effect the velocity propagation factor of a coax cable

A

dielectric constant and permeability

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14
Q

One megahertz is defined as one_____per second

A

million cycles

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15
Q

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

A

current

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16
Q

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

A

vertical sensitivity

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17
Q

what has a 50 ohms impendence

A

RG 58

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18
Q

1x10with a little 9 next to the 10

A

Giga

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19
Q

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

A

total circuit voltage

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20
Q

what is the period of a one hertz waveform?

A

1 second

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21
Q

______is term used to refer to an inductor

A

coil

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22
Q

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

A

period

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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.

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24
Q

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

25
inductance varies as the _____of the number of turns
square
26
unused leads in a transformer should be
insulated from each other
27
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________
Peak value
28
Unless re identified with electrical tape the color ____should not be used for the hot wire in a standard 120 v wall outlet circuit.
white
29
The four types of transformer are
power, rf and audio, isolation
30
In a resonant circuit, capacitance equals inductance
false
31
self inductance is the process by which the changing magnetic field around a conductor induces positive electromotive in the conductor itself
false
32
In an iron core or transformer what is the purpose of insulated lamination?
reduces power wasting edgy currents
33
The voltage rating of a capacitor _______
relates to the maximum voltage that should be applied to it
34
Even if not connected to a circuit , should a large capacitor be considered dangerous?
all large capacitors are potentially dangerous
35
what is the phase relationship in a resistive capacitive circuit where the vector line relationship two lines perpendicular to each other?
90 degree difference
36
in a _______circuit voltage leads current
inductive
37
A burning microwave oven is the example of a _____fire
class c
38
In a capacitive circuit what is the phase relationship of voltage and current ?
current leads
39
Frequency has what unit of measurement?
hertz
40
On an osciliscope which control do you use to adgjust the top to a bottom location of a waveform displayed on the screen?
vertical position
41
An alternating current is a sinusoidal with a positive and negative alternation t/f?
true
42
In a parallel rc circuit the phase relationship between voltage and current is?
90 degrees in the capacitive branch and in phase of the restrictive branch
43
When measuring current the meter should always be?
connected in series with the load
44
Balanced signal wiring is done
to reduce the circuits vulnerability to external interference
45
the impendence for rg58 coax cable is
50 ohms
46
as the distance between the plates of a capacitor decreases the capacitance value ______
increases
47
a capacitor is made up of _____
two plates seperated by a dielectric
48
when the current goes positive at the same time that the voltage producing it goes negative the current is said to be______
out of phase
49
current leads or lags voltage when an ac voltage is applied across a capacitor
leads
50
The y axis's of an oscilloscope is used to measure
amplitude
51
What is the fourth harmonic of 15 khz?
60KHZ
52
The inductive reactance ______an inductor if the frequency of the applied voltage is doubled .
is twice the previous value
53
a resonant circuit with a narrow bandwidth is considered to have a_______
high q
54
Which of the following events would cause an inductive flyback transient to occur
switch contacts in a highly inductive circuit open
55
The capacitance reaction will________when the frequency of an applied voltage is increased.
decrease
56
______is dependant on material and dimension used in the design of each type of coax cables
characteristic impendance
57
when a current level of 0.1 amps from arm to arm in the average adult it would likely result in _____
a death
58
What is the unit of measure for inductors?
henry
59
A sinewave has which of the following characteristics ?
sharp rise and fall times in relations to its period

EM2 (1 decks)

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