Electronic Principles
A current source has an internal resistance of 100 kW. What is the largest load resistance if the current source must appear stiff?

2 k Ohm
1 k Ohm
10 k Ohm
20 k Ohm
None of these

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Electronic Principles
In a pure inductor:

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

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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
None of these
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

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