# Electronics and Communication Engineering - Exam Questions Papers

## Why Electronics and Communication Engineering Exam Questions Papers?

In this section you can learn and practice Electronics and Communication Engineering Questions based on "Exam Questions Papers" and improve your skills in order to face the interview, competitive examination and various entrance test (CAT, GATE, GRE, MAT, Bank Exam, Railway Exam etc.) with full confidence.

## Where can I get Electronics and Communication Engineering Exam Questions Papers questions and answers with explanation?

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## Where can I get Electronics and Communication Engineering Exam Questions Papers Interview Questions and Answers (objective type, multiple choice)?

Here you can find objective type Electronics and Communication Engineering Exam Questions Papers questions and answers for interview and entrance examination. Multiple choice and true or false type questions are also provided.

## How to solve Electronics and Communication Engineering Exam Questions Papers problems?

You can easily solve all kind of Electronics and Communication Engineering questions based on Exam Questions Papers by practicing the objective type exercises given below, also get shortcut methods to solve Electronics and Communication Engineering Exam Questions Papers problems.

1.

In the following non planar graph number of independent loop equations are A. 8 B. 12 C. 7 D. 5

Explanation:

Number of independent loop equations are given by,

L = B - N + 1

where L : No. of loop equations

B : No. of branches = 12

N : No. of nodes = 8

L = 12 - 8 + 1 = 5.

2.

A transmission line has a characteristic impedance of 50 Ω and a resistance of 0.1 Ω/m, if the line is distortion less, the attenuation constant (in Np/m) is

 A. 500 B. 5 C. 0.014 D. 0.002

Explanation:

Distortion less a = RG and Z0 = RG  .

3.

A certain 8 bit uniform quantization PCM system can accommodate a signal ranging from - 1 V to + V. The rms value of the signal is V . The signal to quantization noise ratio is:

 A. 30 dB B. 46.91 dB C. 40 dB D. 49.92 dB

Explanation:

(SNR)dB = 1.76 + 6.02n

n = 8

Thus (SNR)dB = 1.76 + 6.02 x 8 = 49.92 dB.

4.

A rectangular waveguide, in dominant TE mode, has dimensions 10 cm x 15 cm. The cut off frequency is

 A. 10 GHz B. 1 GHz C. 15 GHz D. 25 GHz

Explanation:

For TE10 mode 5.

A radar receiver has a noise figure of 10 dB at 300 K having a bandwidth of 2.5 MHz. The minimum power it can receive is

 A. 3.45 x 10-15 W B. 1.38 x 10-15 W C. 7.5 x 10-15 W D. 93.15 x 10-15 W