41. A Darlington pair amplifier has
(a) high input impedance and high voltage gain.
(b) low input impedance and low voltage gain.
(c) a voltage gain of about 1 and a low input impedance.
(d) a low voltage gain and a high input impedance.
42. A common-emitter amplifier has ________ voltage gain, ________ current gain, ________ power gain, and ________ input impedance.
(a) high, low, high, low
(b) high, high, high, low
(c) high, high, high, high
(d) low, low, low, high
43. To analyze the common-emitter amplifier, what must be done to determine the dc equivalent circuit?
(a) leave circuit unchanged
(b) replace coupling and bypass capacitors with opens
(c) replace coupling and bypass capacitors with shorts
(d) replace VCC with ground
44. Which of the following should be done to obtain the ac equivalent of a network?
(a) Set all dc sources to zero
(b) Replace all capacitors by a short-circuit equivalent.
(c) Remove all elements bypassed by the short-circuit equivalent.
(d) All of the above
45. The ________ model suffers from being limited to a particular set of operating conditions if it is to be considered accurate.
(a) hybrid equivalent
(b) re
(c)
(d) Thevenin
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