Electronic Principles
1 Microfarad is the same as:

1 million picofarads
None of these
1 millionth of a picofarad
1000 millifarads
1 million farads

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Electronic Principles
In a pure inductor:

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

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Electronic Principles
The dielectric constant of a material is a measure of:

the amount of opposition to the current flow
how well the material concentrates magnetic lines of force
the amount of voltage it can withstand before breaking down
None of these
how well the material concentrates electrostatic lines of force

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Electronic Principles
Which one of the following statements is true for the impedance of a series RC circuit?

The impedance is greater than either the resistance or capacitive reactance but less than their sum
None of these
The impedance is equal to the sum of the resistance and capacitive reactance
The impedance is greater than the sum of the resistance and capacitive reactance
The impedance is less than the sum of the resistance and capacitive reactance

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Electronic Principles
Which one of the following phrases best describes residual magnetism?

The amount of magnetic flux that is not confined to the core material of an electromagnet
The force of attraction between the poles of a permanent and temporary magnetic field
Magnetism that remains in the core of an electromagnet after the current through the coil is turned off
The circular magnetic field that surrounds a conductor carrying a current
None of these

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