Electronic Principles
Which one of the following phrases most accurately describes a purely inductive circuit?

The ac voltage lags the current by 90 degree
Inductive reactance provides the only opposition to current flow
None of these
Combinations of resistance and inductive reactance provide any opposition to current flow
Resistances provide the only opposition to current flow

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Electronic Principles
Which one of the following statements is true for the voltage in a parallel RC circuit?

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

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Electronic Principles
Which one of the following principles best describes the basic operation of an electromagnet?

None of these
Current is induced in a conductor that is moving through a magnetic field
Current flowing through a conductor generates a magnetic field
Like magnetic poles attract, while unlike poles repel
Like magnetic poles repel, while unlike poles attract

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Electronic Principles
Which one of the following statements best applies to a parallel RLC circuit?

The voltage waveform for each component always has the same amplitude and phase as the applied voltage
The current waveform for each component always has the same amplitude and phase as the applied current
None of these
The sum of the current is always less than the applied current
All of these

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