Exercise: Analog Electronics

Questions for: Analog Electronics

A CE amplifier has re = 6 Ω, β = 100 and a = 0.98. The input impedance is
A:
6 Ω
B:
100 Ω
C:
600 Ω
D:
98 Ω
Answer: C

Input impedance of CE amplifier is β re = 100 X 6 = 600 Ω.

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In the op-amp circuit given in the figure, the load current iL is
A:
B:
C:
D:
Answer: A

Applying KCL

[KCL at non inverting terminal]

.

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An op-amp integrating circuit uses
A:
an inductor
B:
a capacitor
C:
both inductor and capacitor
D:
none of the above
Answer: B

Capacitor in feedback path provides integration.

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In Class C operation the collector current looks like
A:
full sine wave
B:
half sine wave
C:
narrow pulses
D:
nearly half sine wave
Answer: C

Since collector current exists for less than 180°, it looks like narrow pulses.

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A Hartley oscillator is used for
A:
very low frequencies
B:
radio frequencies
C:
micro wave frequencies
D:
audio frequency
Answer: B

LC oscillators are used for radio frequencies.

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