Electronic Principles
A device that converts thermal energy to electrical energy is called a:

chemical cell
thermocouple
piezoelectric devices
None of these
solar cell

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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
Hysteresis is most apparent when the core material is saturated
Hysteresis is most apparent when a steady amount of current is lowing through the coil of an electromagnet
None of these
Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently

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Electronic Principles
What is a free electron?

An electron that has twice the amount of charge of a normal electron
An electron that has no electrical charge
An electron that has been freed from its parent atom
None of these
An electron that costs nothing

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

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

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