Electronic Principles
At room temperature an intrinsic silicon crystal acts approximately like

a conductor
a piece of copper wire
None of these
an insulator
a battery

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

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

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

Combinations of resistance and capacitive reactance provide any opposition to current flow
None of these
Resistances provide the only opposition to current flow
Capacitive reactance provides the only opposition to current flow
The ac voltage leads the current by 90 degree

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