Electronics and Communication Engineering - Exam Questions Papers

1. 

The circuit given below is:

A. Band stop filter
B. Band pass filter
C. Oscillator circuit
D. All pass filter

Answer: Option B

Explanation:

The given circuit is Band pass filter

.


2. 

Rank of the matrix:

A. 3
B. 2
C. 1
D. 4

Answer: Option C

Explanation:

The given matrix is equivalent to

,

Thus rank is 1.


3. 

His rather casual remarks on politics __________ his lack of seriousness about the subject.

A. masked
B. belied
C. cherish
D. conserve

Answer: Option C

Explanation:

The key words in the statement are 'casual remarks' and 'lack of seriousness'.

The blank should be filled with a word meaning 'showed' or 'revealed'. Hence, 'betrayed' is the correct answer.


4. 

The resolution of a 4 bit counting ADC is 0.5 volts. For an analog input of 6.6 volts, the digital output of the ADC will be

A. 1011
B. 1101
C. 1100
D. 1110

Answer: Option D

Explanation:

Resolution =

= 0.5

2n = 14 = (1110)

n = 4 bits.


5. 

For the power amplifier circuit shown below, the maximum power dissipated by both output transistor is

A. 9.66 W
B. 30.11 W
C. 31.66 W
D. 33.66 W

Answer: Option C

Explanation:

The max. power dissipated by both output transistor is max. P2 = = 31.66 W.


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