Electronics and Communication Engineering - Exam Questions Papers

41. 

For a second order instrument, the optimum range of ξ (damping ratio), which gives good frequency response over a wide range of frequencies is

A. 0.5 to 0.6
B. 0.6 to 0.7
C. 0.7 to 0.8
D. 0.8 to 1.0

Answer: Option A

Explanation:

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42. 

If the connection of two-port is such that the transmission matrix of the overall network is the product of the transmission matrices of the individual networks, what type of connection is it?

A. Series connection
B. Cascade connection
C. Parallel connection
D. None of the above

Answer: Option B

Explanation:

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43. 

A 3 x 8 decoder with two enable inputs is to be used to address 8 blocks of memory. What will be the size of each memory block when addressed from a sixteen bit bus with two MSBs used to enable the decoder?

A. 2 K
B. 4 K
C. 16 K
D. 64 K

Answer: Option A

Explanation:

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44. 

What is the purpose of a start in RS232 serial communication protocol?

A. To synchronise receiver for receiving every byte
B. To synchronise receiver for receiving a sequence of byte
C. Acts as a parity bit
D. To synchronise receiver for receiving the last byte

Answer: Option A

Explanation:

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45. 

Time delay produced by an instruction code given below using 2 MHz clock is:
MVI A, FFH
LOOP: DCR A
JNZ Loop

A. 1783 μs
B. 1787 μs
C. 1781 μs
D. 1797 μs

Answer: Option B

Explanation:

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