Exercise: Analog Electronics

Questions for: Analog Electronics

In a good voltage amplifier, its input impedance
A:
must be high compared to the resistance of the source
B:
must be low compared to the resistance of the source
C:
must be equal to the resistance of the source
D:
must be half the resistance of the source
Answer: A
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In figure output impedance of amplifier is
A:
RE
B:
C:
D:
re + RE
Answer: C
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The upper end of the d.c. load line is called the __________ point and the lower end is the __________ point.
A:
cut off, saturation
B:
saturation, active
C:
saturation, cut off
D:
active saturation
Answer: C
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A generator with an internal resistance of 600 Ω drives an amplifier whose input resistance is 400 Ω. The generator's open circuit voltages is 1 mV; the amplifier develops 100mV across an 8kΩ load. The power gain is
A:
125
B:
250
C:
1125
D:
3125
Answer: D
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The phase angle of lead circuit is
A:
between 0 and -90°
B:
between 0 and +90°
C:
90°
D:
more than 90°
Answer: B
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