New Zealand NZART pool, section ZLB08

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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