qhotti
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In a DC circuit, ? will oppose current flow.
a.
eddy currents
b.
resistance
c.
skin effect
d.
all of the above
The correct answer is: resistance
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In an AC circuit, ? will oppose current flow.
a.
eddy currents
b.
resistance
c.
skin effect
d.
all of the above
The correct answer is: all of the above
-
Current passing through a resistance produces ? .
a.
a dissipation of power
b.
a voltage drop
c.
heat
d.
all of the above
The correct answer is: all of the above
-
How can instantaneous AC current values be determined?
d.
-
What is the instantaneous value of a 10 ampere peak sine wave at 0, 30, 45, 60, and 180
degrees?
0° = ? amps
30° = ? amps
45° = ? amps
60° = ? amps
180° = ? amps
0
5
7.07
8.66
0
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Current and voltage in an AC resistive circuit are ? phase.
a.
in
b.
out of
c.
single
d.
three
The correct answer is: in
-
Drag the appropriate current sine wave to the correct location to show an in-phase
relationship.
no answer
-
Given the circuit, solve for the following: (Round the FINAL answer to two decimal places,
if needed.)
What is the peak voltage for the circuit?
What is the effective voltage for the circuit?
What is the total power or wattage of the circuit?
The correct answer is: 300 Volts
The correct answer is: 212.13 Volts
The correct answer is: 2250 Watts
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Factors such as skin effect and eddy currents are present in an AC circuit and, in practice,
? the resistance of the conductor.
a.
decrease
b.
increase
c.
do not affect
The correct answer is: increase
-
As frequency increases, skin effect ? .
a.
increases
b.
decreases
c.
stays the same
The correct answer is: increases
-
Skin effect and eddy currents ? present in a DC circuit, and, therefore, will not be
factors that affect the opposition to current flow in a DC circuit.
a.
are
b.
are not
The correct answer is: are not
-
Skin effect can be ? by using stranded conductors, which provide greater surface area
for current than solid conductors.
a.
reduced
b.
increased
The correct answer is: reduced
-
The ? value of AC voltage will produce the same amount of power as a like value of DC
voltage.
a.
average
b.
effective
c.
nominal
d.
peak
The correct answer is: effective
-
When an AC voltage is given, it is always the ? value unless stated otherwise.
a.
average
b.
nominal
c.
peak
d.
RMS
The correct answer is: RMS
-
Match the points on the sine wave that indicate the values in the table.
Average voltage
Effective voltage (RMS)
Peak-to-peak voltage
Peak voltage
d
c
a
b
-
The ? value is the actual average of all the instantaneous voltage or current values
across a full cycle of a rectified sine wave.
a.
average
b.
effective
c.
peak
d.
RMS
The correct answer is: average
-
The average value of halfwave rectified DC is ? times the peak AC value or one-half of
the average value.
a.
0.318
b.
0.637
c.
0.707
d.
1.414
The correct answer is: 0.318
-
Given the circuit, solve for the following: (Round the FINAL answers to two decimal
places.)
The parallel circuit has 42.4 peak volts applied, a given R resistance of 5,600 ohms,
and a peak current through R of 9 milliamperes.
What is the effective voltage?
What is the resistance of R ?
What is the peak current through R?
What is the total effective current?
What is the effective power consumed by this circuit?
The correct answer is: 29.98 Volts
The correct answer is: 4711 Ω
The correct answer is: 7.57 mA
The correct answer is: 11.72 mA
The correct answer is: 351 mW
