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Electronics and Communication Engineering - Exam Questions Papers

Exercise : Exam Questions Papers - Exam Paper 7
11.
With respect to the Miller integrator sweep shown below, the sweep rate will be
2
4
1.5
2.5
Answer: Option
Explanation:

Sweep rate = .

12.
The trigonometric Fourier series for the waveform f(t) shown below contain
only cosine terms and zero value for the dc component
only cosine terms and a positive value for the dc component
only cosine terms and a negative value for the dc component
only sine terms and a negative for the dc component
Answer: Option
Explanation:

Since given waveform is even, thus it will have only cosine terms. Function f(t) has more negative value then positive, so it will have negative DC Component.

13.
For a class B amplifier using a supply of VCC = 30 V and driving a load of 16 Ω the maximum efficiency will be __________ .
72.4%
78.54%
62.4%
68.54%
Answer: Option
Explanation:

The maximum output power is

14.
If x[n] = cos then the sequence x[n] is
non-periodic
periodic
depends on n
none of these
Answer: Option
Explanation:

Consider cos= cos= cos

Number of samples per period = 16p

This is not a rational number. Hence signal is non periodic.

15.
The point P in the following figure is stock at 1. The output f will be
ABC
A
AB C
A
Answer: Option
Explanation:

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