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

emitter current
collector current
supply current
None of these
base current

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Electronic Principles
A low-pass filter:

reduces the level of all frequencies by a significant amount
None of these
has no effect on ac signals
passes lower-frequency signals and reduces higher-frequency signals
passes higher-frequency signals and reduces lower-frequency signals

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