Electronics and Communication Engineering - Exam Questions Papers

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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

Answer: Option D

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

Answer: Option D

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

Answer: Option D

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

Answer: Option B

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

Answer: Option D

Explanation:

Pm = kT0Δf(F - 1) = 93.15 x 10-15 W.


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