26. The differential amplifier has
(a) one input and one output.
(b) two inputs and two outputs.
(c) two inputs and one output.
(d) one input and two outputs.
27. The differential amplifier produces outputs that are
(a) common mode.
(b) in-phase with the input voltages.
(c) the sum of the two input voltages.
(d) the difference of the two input voltages.
28. For the common-emitter amplifier ac equivalent circuit, all capacitors are
(a) effectively shorts.
(b) effectively open circuits.
(c) not connected to ground.
(d) connected to ground.
29. In a common-base amplifier, the input signal is connected to the
(a) base.
(b) collector.
(c) emitter.
(d) output.
30. For a common-emitter amplifier, the purpose of the emitter bypass capacitor is
(a) no purpose, since it is shorted out by RE.
(b) to reduce noise.
(c) to despike the supply voltage.
(d) to maximize amplifier gain.
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