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Electronics and Communication Engineering - Analog Electronics

Exercise : Analog Electronics - Section 6
46.
In a capacitor filter, the time constant RLC should be small.
True
False
Answer: Option
Explanation:

Time constant should be large.

47.
A 741 type op-amp has a gain bandwidth product of 1 MHz. A non-inverting amplifier using this op-amp and having a voltage gain of 20 dB will exhibit a -3dB bandwidth of
50 kHz
100 kHz
Answer: Option
Explanation:

As we know, Gain Bandwidth, Product = β x A

106 = β x A

20 log A = 20

A = 10' 10

β = 100 kHz.

48.
In a full wave rectifier circuit using centre tapped transformer, the peak voltage across half the secondary winding is 40 V. If diodes are ideal, the average output voltage is
40 V
25.5 V
20 V
2.55 V
Answer: Option
Explanation:

.

49.
In the circuit of figure, PIV can be up to
Em
2 Em
0.5 Em
2 Em
Answer: Option
Explanation:

Peak inverse voltage can be upto 2Em since capacitor can store charge equal to Em.

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