Electronic Principles
The graph of current gain versus collector current indicates that the current gain

None of these
is contant
equals the collector current divided by the base current
varies enormously
varies slightly

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

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

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

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

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Electronic Principles
What is the primary difference between primary and secondary cell batteries?

Primary-cell batteries can be recharged and used many times, whereas secondary-cell batteries cannot be properly recharged
None of these
Secondary-cell batteries can be recharged and used many times, whereas primary-cell batteries cannot be properly recharged
Primary-cell batteries must be recharged at a much slower rate that secondary-cell batteries
Primary-cell batteries use chemical cells, whereas secondary-cell batteries use an alternative energy source, such as thermal or magnetic energy, to supplement their outputs

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Electronic Principles
In a pure inductor:

ac current and voltage are exactly in phase
None of these
ac current is converted to dc voltage
ac current lags the voltage by 90 degree
ac current leads the voltage by 90 degree

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