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Electronics and Communication Engineering - Electronic Devices and Circuits

Exercise : Electronic Devices and Circuits - Section 6
41.
Out of 5 M x 8, 1 M x 16, 2 M x 16 and 3M x 8 memories, which memory can store more bits?
5 M x 8
2 M x 16
3 M x 8
1 M x 16
Answer: Option
Explanation:

Bits are 40 M, 16 M and 32 M.

42.
A 6 bit ladder A/D converter has input 101001. The output is (assume 0 = 0 V and 1 = 10 V)
4.23
6.41
5.52
9.23
Answer: Option
Explanation:

Output = 10 j 6.41 V.

43.
A ripple counter has 4 bits and uses flip flops with propagation delay time of 25 ns. The maximum possible time for change of state will be
25 ns
50 ns
75 ns
100 ns
Answer: Option
Explanation:

In ripple counter all the delays are added.

44.
A counter has a modulus of 10. The number of flip flops is
10
5
4
3
Answer: Option
Explanation:

23 = 8 and 24 = 16 Therefore 4 flip-flops are needed. Some states will be skipped to give a modulus of 10.

45.
The counter shown in the given figure is built using 4 -ve edge triggered toggle FFs. The FF can be set asynchronously when R = 0. The combinational logic required to realize a modulo-13 counter is
F = Q4 Q3 Q2 Q1
F = Q4 + Q3 + Q2 + Q1
F = Q4 + Q3 + Q2 + Q1
F = Q4Q3Q2Q1
Answer: Option
Explanation:

Counter is modulo-13, it will count up to 15 but due to mod-13, it will be reset at 13, (13)10 = (1101 )2 = Q4 Q3 Q2 Q1.

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