Electronic Principles
The rms value of a sine waveform is:

equal to 0.707 times the peak amplitude
the number of cycles completed in one second
None of these
the time required to complete one full cycle
equal to 1.41 times the peak amplitude

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

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

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Electronic Principles
Which one of the following is a statement of Kirchhoffs current law?

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

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