Electronic Principles
Current can flow through a normally open push button switch as long as:

you are pressing the button
its contact remain open
its contact remain open
you are not pressing the button
None of these

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Electronic Principles
Which one of. the following phrases most accurately describes the nature of a pulsating dc voltage?

None of these
The voltage remains at one polarity but changes value periodically
The voltage causes current to flow in two directions at the same time
The voltage reverses polarity periodically
The voltage remains at one polarity and at a steady level

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Electronic Principles
The rms value of a sine waveform is:

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

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Electronic Principles
Which one of the following statements is true?

All of these
Power dissipation of a pure capacitor decreases with operating frequency
Power dissipation of a pure capacitor increases with operating frequency
None of these
There is no meaningful relationship between the power dissipation of a pure capacitor and its operating frequency

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

an increase in current through the coil causes no further increase in the mmf
the core is permitted to move freely within the coil
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
None of these

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Electronic Principles
Which one of the following statements is true for the currents in a parallel RC circuit?

None of these
The total current. is greater than the sum of the currents for the resistance and capacitance
The total current is less than the sum of the currents for the resistance and capacitance
The total current is equal to the sum of the currents for the resistance and capacitance
The current always has the same amplitude and phase for every part of the circuit

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