Electronic Principles
The total impedance of a parallel RLC circuit:

is maximum at the resonant frequency
always decreases as the applied frequency increases
None of these
is equal to the sum of the values of resistance, inductive reactance and capacitive reactance
always increases as the applied frequency increases

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Electronic Principles
Which one of the following statements is true for the voltages in a series RL circuit?

The voltage always has the same amplitude and phase for every part of the circuit
The total voltage lags the total current by less than 90
The total voltage is less than the sum of the voltages across the resistance and inductance
The total voltages is equal to the sum of the voltages across the resistance and inductance
None of these

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Electronic Principles
The south pole of a magnet is the one:

that would be attracted to the earth's south magnetic pole
that has its molecules arranged in a random pattern
that would be repelled by the north pole of another magnet
None of these
that would be attracted to the earths north magnetic pole

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Electronic Principles
Which one of the following statements best describes magnetic hysteresis?

Hysteresis is most apparent when the core material is saturated
Hysteresis is the amount of magnetic flux that is not confined to the core material of an electromagnet
None of these
Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently
Hysteresis is most apparent when a steady amount of current is lowing through the coil of an electromagnet

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