Electronics and Communication Engineering - Exam Questions Papers

11. 

With respect to the Miller integrator sweep shown below, the sweep rate will be

A. 2
B. 4
C. 1.5
D. 2.5

Answer: Option A

Explanation:

Sweep rate = .


12. 

The trigonometric Fourier series for the waveform f(t) shown below contain

A. only cosine terms and zero value for the dc component
B. only cosine terms and a positive value for the dc component
C. only cosine terms and a negative value for the dc component
D. only sine terms and a negative for the dc component

Answer: Option C

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 __________ .

A. 72.4%
B. 78.54%
C. 62.4%
D. 68.54%

Answer: Option B

Explanation:

The maximum output power is


14. 

If x[n] = cos then the sequence x[n] is

A. non-periodic
B. periodic
C. depends on n
D. none of these

Answer: Option A

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

A. ABC
B. A
C. AB C
D. A

Answer: Option D

Explanation: