Electronic Principles
The transistor has a collector current of 2 mA. If the current gain is 135, what is the base current?

None of these
10.3 µA
7.8 µA
7.75 µA
14.8 µA

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Electronic Principles
For a pure capacitor:

ac current lags the voltage by 90 degree
ac current is converted to dc voltage
None of these
ac current leads 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:

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

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