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Electronics and Communication Engineering - Electronic Devices and Circuits

Exercise : Electronic Devices and Circuits - Section 6
36.
A pulse train with a 1 MHz frequency is counted using a 1024 modulus ripple counter using JK flip flops. The maximum propagation delay for each flip-flop should be
1 μs
0.5 μs
0.2 μs
0.1 μs
Answer: Option
Explanation:

Total delay = = 1 ms = 10 x delay of one flip flop. Therefore delay for one flip-flop = 0.1 ms.

37.
What will be maximum input that can be converted for a 6 bit dual slope A/D converter uses a reference of -6v and a 1 MHz clock. It uses a fixed count of 40 (101000).
9 V
9.45
10 V
8 V
Answer: Option
Explanation:

.

38.
In the given figure shows a logic circuit. The minimum Boolean expression for this circuit is
A + B
A + B + C
AB + C
AB + AC + BC
Answer: Option
Explanation:

Output A(B + C) + AB + C(A + B) = AB + AC + AB + AC + BC = B + A + BC = A + B + C.

39.
If number of information bits is 11, the number of parity bits in Hamming code is
5
4
3
2
Answer: Option
Explanation:

2p > m + p + 1. If m = 11, p must be 4 to satisfy this equation.

40.
The number of digit 1 present in the binary representation of 3 x 512 + 7 x 64 + 5 x 8 + 3 is
8
9
10
12
Answer: Option
Explanation:

3 x 512 + 7 x 64 + 5 x 8 + 3

= (2 + 1) x 29 + (4 + 2 + 1)26 + (4 + 1)23 + (2 + 1)

= 210 + 29 + 28 + 27 + 26 + 25 + 23 + 21 + 1

= 210 + 29 + 28 + 27 + 26 + 25 + 23 + 21 + 20

9 term of power two

Hence number of '1' is 9.

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