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Electronics and Communication Engineering - Analog Electronics

Exercise : Analog Electronics - Section 6
26.
In the circuit of figure diode will conduct
from 90 to 180° in the positive half cycle
from 30° to 180° in the positive half cycle
from 50° to 160° in the positive half cycle
from 30° to 150° in the positive half cycle
Answer: Option
Explanation:

Diode will conduct when instantaneous value of ac voltage is more than 50 V.

27.
The input to integrating op-amp is a rectangular wave. The output will be
a sine wave
a rectangular wave
a triangular wave
none of the above
Answer: Option
Explanation:

Integral of constant is t.

28.
The most widely used diode rectifier circuit is
half wave
full wave with centre tapped transformer
bridge
either (a) or (b)
Answer: Option
Explanation:

Bridge rectifier has the advantage of lower PIV. Moreover it does not require centre tapped transformer.

29.
In figure, V0 =
-1 V
2 V
+1 V
+15 V
Answer: Option
Explanation:

.

30.
The main advantage of a crystal oscillator
can oscillate any frequency
gives a high output voltage
frequency of oscillation is almost constant
can operates at a low dc voltage
Answer: Option
Explanation:

Crystal oscillator has the advantage of frequency stability.

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