Exercise: Electronic Principles

Questions for: Electronic Principles

A transformer has a primary voltage of 120 V rms and a secondary voltage of 25 V rms. If the secondary current is 1A rms, what is the primary current?
A:
7.8 mA
B:
208 mA
C:
200 mA
D:
300 mA
Answer: B
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Which one of the following phrases best describes residual magnetism?
A:
Magnetism that remains in the core of an electromagnet after the current through the coil is turned off
B:
The force of attraction between the poles of a permanent and temporary magnetic field
C:
The amount of magnetic flux that is not confined to the core material of an electromagnet
D:
The circular magnetic field that surrounds a conductor carrying a current
Answer: A
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Which one of the following statements best describes magnetic hysteresis?
A:
Hysteresis is the amount of magnetic flux that is not confined to the core material of an electromagnet
B:
Hysteresis is most apparent when a steady amount of current is lowing through the coil of an electromagnet
C:
Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently
D:
Hysteresis is most apparent when the core material is saturated
Answer: C
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The equivalent of 1 micro A is:
A:
10000A
B:
1000 A
C:
one-millionth of an ampere
D:
one million amperes
Answer: C
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Which one of the following statements best applies to a parallel RLC circuit?
A:
The voltage waveform for each component always has the same amplitude and phase as the applied voltage
B:
The sum of the current is always less than the applied current
C:
The current waveform for each component always has the same amplitude and phase as the applied current
D:
All of the above
Answer: A
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