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Electronics and Communication Engineering - Analog Electronics

Exercise : Analog Electronics - Section 2
6.
A 12 kHz pulse wave-form is amplified by a circuit having an Upper cut-off frequency of 1 MHz. The minimum input pulse width that can be accurately reproduced is
83.33 μ sec
1 μ sec
0.1 m sec
3.5 m sec
Answer: Option
Explanation:

tr = 10% Pω = minimum Power(P) = 10 tr 10 x 0.35 μ sec = 3.5 μ sec.

Note: The I/P Pulse will be severely distorted if the rise time is more than 10% of Pulse width.

7.
Feedback factor may be less or more than 1.
True
False
Answer: Option
Explanation:

Feedback factor is much less than 1.

8.
An RC oscillator uses
one RC combination
two RC combinations
at least three RC combinations
either (a) or (b)
Answer: Option
Explanation:

One RC combination can give a phase shift of less them 90°. Therefore 3 RC combinations are required for 180° phase shift.

9.
The main advantage of CMOS circuit is
high gain
high output impedance
low power consumption
high gain and high output impedance
Answer: Option
Explanation:

Low power consumption is a big advantage in digital circuits.

10.
Ac signals are given to both inverting and non-inverting terminals of an op-amp. When will the output maximum
when the phase difference between the inputs is 0°
when the phase difference between the inputs in 90°
when the phase difference between the inputs is 180°
when the phase difference between the inputs is 0 or 180°
Answer: Option
Explanation:

For non-inverting terminal input, output is in phase with input. For inverting terminal input, output is 180° out of phase with input. If inputs have 180° phase difference, outputs will be in phase and additive.

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