Analog Electronics
In MOSFET devices the N-channel type is better the P-channel type in the following respects

  it is faster.
  it is TTL compatible.
  it has better noise immunity.
  it has better drive capability.

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Analog Electronics
In all base driver amplifiers

ac collector voltage is in phase with ac base voltage
ac collector voltage is 180° out of phase with ac base voltage
ac emitter voltage is 180° out of phase with ac base voltage
None of these

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