Electronic Principles
Which one of the following is a statement of KirchhofFs voltage law?

The algebraic sum of voltages in a loop is equal to zero
The voltage drop across a resistance is proportional to the value of resistance and the amount of current flowing through it
The algebraic sum of voltages entering and leaving a point is equal to zero
None of these
The total voltage in a parallel circuit is less than the value of the smallest voltage

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Electronic Principles
A low-pass filter:

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

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

The total voltages is less than the sum of the voltages across the resistance and inductance
The total voltage is equal to the sum of the voltages across the resistance and inductance
The total voltage lags the total current by less than 90
None of these
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 statements best describes magnetic hysteresis?

Hysteresis is the amount of magnetic flux that is not confined to the core material of an electromagnet
None of these
Hysteresis is most apparent when a steady amount of current is lowing through the coil of an electromagnet
Hysteresis is most apparent when the core material is saturated
Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently

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