Electronic Principles
Current and voltage are said to be in phase when:

None of these
they have the same amplitude and frequency
All of these
their waveforms cross through zero and reach positive and negative peaks at the same time
their waveforms are both ac or both dc

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Electronic Principles
Which one of the following principles best describes the basic operation of a generator?

Current flowing through a conductor generates a magnetic field
Current is induced in a conductor that is moving through a magnetic field
Like magnetic poles repel; unlike poles attract
Like magnetic poles attract; unlike poles repel
None of these

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Electronic Principles
One henry of inductance is defined as:

the amount of inductance required for generating 1 V of counter emf when the current changes at the rate of 1 A per second
the amount of inductance required to change the frequency of a current by 1 Hz
the amount of counter emf required to reduce a current to 1 A
None of these
the number of turns of wire in an inductor multiplied by the amount of current flowing through it

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