Analog Electronics
The most commonly used amplifier in sample & hold circuits is

A unity gain non-inverting amplifier
An inverting amplifiers with a gain of 100
A unity gain inverting amplifier
An inverting amplifier with a gain of 10

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Analog Electronics
The magnitude of electric current ICBO

  depends largely upon the emitter doping.
  is generally greater in silicon than in germanium transistor.
  depends largely upon emitter-base junction base potential.
  increases with the increase in temperature.

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Analog Electronics
In all base driver amplifiers

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

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