Electronic Principles
At room temperature an intrinsic semiconductor has

No holes
None of these
many holes
a few free electrons and holes
many free electrons

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

The total resistance in a parallel circuit is equal to the average value of the individual resistances
The total resistance of a parallel circuit is always less than the value of the smallest resistance
None of these
The total resistance of a parallel circuit is equal to the total voltage
The total resistance is equal to the sum of the individual resistances in a parallel circuit.

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

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

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Electronic Principles
The core of an electromagnet is said to be in saturation when:

changing the polarity of the current in the coil changes the polarity of the magnetic field around the core
frequent changes in the direction of current through the coil causes heating effects in the core material
None of these
the core is permitted to move freely within the coil
an increase in current through the coil causes no further increase in the mmf

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Electronic Principles
When a parallel RLC circuit is operating at its resonant frequency:

capacitive reactance is greater than the inductive reactance
inductive reactance is equal to the capacitive reactance
None of these
the difference between inductive and capacitive reactance is equal to the resistance
inductive reactance is greater than the capacitive reactance

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