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Electronics and Communication Engineering - Exam Questions Papers

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Home » Engineering » Electronics and Communication Engineering » Exam Questions Papers » Exam Paper 1

Exercise :: Exam Questions Papers - Exam Paper 1

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.

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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 →

.

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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.

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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

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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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