Electronic Principles
What form of energy is used for creating static electricity?

Light energy
Chemical energy
Mechanical energy
Solar energy
None of these

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Electronic Principles
The total impedance of a parallel RLC circuit:

None of these
is equal to the sum of the values of resistance, inductive reactance and capacitive reactance
always increases as the applied frequency increases
is maximum at the resonant frequency
always decreases as the applied frequency increases

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Electronic Principles
The core of an electromagnet is said to be in saturation when:

changing the polarity of the current in the coil changes the polarity of the magnetic field around the core
an increase in current through the coil causes no further increase in the mmf
the core is permitted to move freely within the coil
None of these
frequent changes in the direction of current through the coil causes heating effects in the core material

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Electronic Principles
What is the difference between a conductor and an insulator?

The difference between conductors and insulators depends on how they are used
An insulator allows current to flow much easier than a conductor does
None of these
A conductor allows current to flow much easier than an insulator does
An insulator has an excessive number of free electrons, while a conductor has a few free electrons or none at all

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