Electronics and Communication Engineering - Exam Questions Papers

46. 

An audio signal is to be transmitted digitally. Which is the system best suited for good fidelity?

A. 8 bit PCM
B. 13 bit PCM
C. 32 bit PCM
D. PCM system with non-uniform quantizer

Answer: Option D

Explanation:

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47. 

The pre-emphasis in FM aids in providing extra noise immunity by

A. emphasizing only the higher frequency components
B. emphasizing the entire frequency band
C. emphasizing only the lower frequency band
D. cutting down the low frequency noise

Answer: Option C

Explanation:

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48. 

Two products are sold from a vending machine, which has two push buttons P1 and P2. When a button is pressed, the price of the corresponding product is displayed in a 7-segment display. If no buttons are pressed, '0' is displayed, signifying 'Rs' .0'. If only P1 is pressed, '2' is displayed, signifying 'Rs. 2'.
If only P2 is pressed, '5' is displayed, signifying 'Rs. 5'.
If both P1 and P2 are pressed, 'E' is displayed, signifying 'Error'. The names of the segments in the 7-segment display, and the glow of the display for '0', '2', '5' and 'E', are shown below.

Consider

  1. push button pressed/not pressed is equivalent to logic 1/ 0 respectively
  2. a segment a to g are considered as functions of P1 and P2, then which of the respectively.
What are the minimum number of NOT gates and 2-input OR gates required to design the logic of the driver for this 7-segment display?

A. 3 NOT and 4 OR
B. 2 NOT and 4 OR
C. 1 NOT and 3 OR
D. 2 NOT and 3 OR

Answer: Option D

Explanation:

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49. 

Gain of the circuit shown below is:

A. 3
B.
C.
D. -1

Answer: Option A

Explanation:

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50. 

A negative-feedback closed-loop system is supplied to an input 5 V. The system has a forward gain of 1 and a feedback gain of 1 and a feedback gain of 1. What is the output voltage?

A. 1.0 V
B. 1.5 V
C. 2.0 V
D. 2.5 V

Answer: Option D

Explanation:

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