Electronic Principles
An intrinsic semiconductor has some holes in it at room temperature. What causes these holes?

None of these
Doping
Thermal energy
Free electrons
Valence electrons

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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 total voltage in a parallel circuit is less than the value of the smallest voltage
None of these
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

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Electronic Principles
In a pure inductor:

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

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Electronic Principles
The period of a waveform is:

equal to 0.707 times the peak amplitude
the time required for the voltage to rise from 10% to 90% of the peak amplitude
the number of cycles completed in one second
None of these
the time required to complete one full cycle

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