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Subelement ZLB
Basic Electrical Theory
Section ZLB08
Alternating Current
ZLB0801
An 'alternating current' is so called because
Correct Answer
A.
it
reverses
direction
periodically
B.
it travels through a circuit using alternate paths
C.
its direction of travel is uncertain
D.
its direction of travel can be altered by a switch
ZLB0801
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ZLB0802
The time for one cycle of a 100 Hz signal is
A.
1 second
Correct Answer
B.
0.
01
second
C.
0.0001 second
D.
10 seconds
ZLB0802
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ZLB0803
A 50 hertz current in a wire means that
A.
a potential difference of 50 volts exists across the wire
B.
the current flowing in the wire is 50 amperes
C.
the power dissipated in the wire is 50 watts
Correct Answer
D.
a
cycle
is
completed
50
times
in each second
ZLB0803
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ZLB0804
The current in an AC circuit completes a cycle in 0.1 second. So the frequency is
A.
1 Hz
Correct Answer
B.
10
Hz
C.
100 Hz
D.
1000 Hz
ZLB0804
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ZLB0805
An impure signal is found to have 2 kHz and 4 kHz components. This 4 kHz signal is
A.
a fundamental of the 2 kHz signal
B.
a sub-harmonic of 2 kHz
C.
the DC component of the main signal
Correct Answer
D.
a harmonic of the 2 kHz signal
ZLB0805
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ZLB0806
The correct name for the equivalent of 'one cycle per second' is one
A.
henry
B.
volt
Correct Answer
C.
hertz
D.
coulomb
ZLB0806
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ZLB0807
One megahertz is equal to
A.
0.0001 Hz
B.
100 kHz
Correct Answer
C.
1000
kHz
D.
10 Hz
ZLB0807
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ZLB0808
One GHz is equal to
A.
1000 kHz
B.
10 MHz
C.
100 MHz
Correct Answer
D.
1000 MHz
ZLB0808
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ZLB0809
The 'rms value' of a sine-wave signal is
A.
half the peak voltage
B.
1.414 times the peak voltage
C.
the peak-to-peak voltage
Correct Answer
D.
0
.
707
times the peak voltage
ZLB0809
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ZLB0810
A sine-wave alternating current of 10 ampere peak has an rms value of
A.
5 amp
Correct Answer
B.
7
.
07
amp
C.
14.14 amp
D.
20 amp
ZLB0810
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