Electronic Principles
The current gain of a transistor is defined as the ratio of the collector current to the

None of these
base current
emitter current
supply current
collector current

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

None of these
Capacitive reactance provides the only opposition to current flow
Resistances provide the only opposition to current flow
Combinations of resistance and capacitive reactance provide any opposition to current flow
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:

None of these
frequent changes in the direction of current through the coil causes heating effects in the core material
changing the polarity of the current in the coil changes the polarity of the magnetic field around the core
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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