# Deemed University 2009 A.M.I.E.T.E Electronics & Communication Engineering Communication engineering – et (old scheme) - Question Paper

Tuesday, 30 April 2013 03:35Web

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AMIETE – ET (OLD SCHEME)

Code: AE15 Subject: COMMUNICATION ENGINEERING

**Time:**three Hours Ma

**x.**

**Marks:**100

NOTE: There are nine ques. in all.

· ques. one is compulsory and carries 20 marks. ans to

**Q.**

**1.**must be written in the space given for it in the ans book supplied and nowhere else.

· Out of the remaining 8 ques. ans any 5 ques.. every ques. carries 16 marks.

· Any needed data not explicitly given, may be suitably presumed and said.

**Q.1**select the accurate or the best option in the following: (210)

**a.**Unwanted energy, usually of random nature, current in a transmission system, due to any reason is called

**(**nois

**A)****e.**

**(**random signal.

**B)****(**info.

**C)****(**carrier.

**D)**For a receiver of noise figure F operating at , K, the equivalent noise temperature is provided by

**(**.

**A)****(**.

**B)****(**.

**C)****(**.

**D)**Modulation index of an AM wave with is

**(**40%.

**A)****(**80%.

**B)****(**125%.

**C)****(**360V.

**D)**If there are (N an integer) equally likely and independent messages, then info bits in every message is

**(**.

**A)****(**.

**B)****(**.

**C)****(**N.

**D)**The Hamming distance of an orthogonal code of k info bits is equal to

**(**.

**A)****(**.

**B)****(**.

**C)****(**.

**D)**If sampling of 20 Hz bandwidth signals is at Nyquist rate using three bits per sample, then the bit rate (bits/s) is

**(**

**A)****1**

**7.****(**.

**B)****(**

**C)****60.**

**(**120.

**D)**The nonlinear device with kind characteristics used in a square-law AM demodulator is a

**(**diod

**A)****e.**

**(**capacitor.

**B)****(**resistor.

**C)****(**comparator.

**D)**h. An amplitude-modulated signal, carrier plus double sideband is passed through a filter before transmission to the receiving end in the

Earning: Approval pending. |