Electronics and Communication Engineering - Exam Questions Papers

31. 

What was the first commercial geostationary communication satellite?

A. INTELSAT 1
B. ECHO
C. INSAT-1A
D. SPUTNIK

Answer: Option A

Explanation:

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32. 

Assertion (A): When all inputs of a NAND-gate are shorted to get a one input, one output gate, it becomes an inverter.

Reason (R): When all inputs of a NAND-gate are at logic 'O' level, the output is at logic 'I' level.

A. Both A and R are individually true and R is the correct explanation of A
B. Both A and R are individually true but R is not the correct explanation of A
C. A is true but R is false
D. A is false but R is true

Answer: Option B

Explanation:

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33. 

Which of the following devices has the 'negative resistance' characteristic?

A. Reflex klystron
B. Gunn diode
C. P-N-P transistor
D. Magnetron

Answer: Option B

Explanation:

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34. 

Which of the following may result in instability problem?

A. Large error
B. High selectivity
C. High gain
D. Noise

Answer: Option C

Explanation:

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35. 

Which of the following are included in the architecture of a computer?

  1. Addressing modes, CPU
  2. Instruction set, data formats
  3. Secondary memory, operating system
Select the correct answer from the codes given below:

A. 1 and 2
B. 1 and 3
C. 2 and 3
D. 3 only

Answer: Option A

Explanation:

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