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Electronics and Communication Engineering - Exam Questions Papers

Exercise : Exam Questions Papers - Exam Paper 8
36.
Consider the following statements a half adder.
  1. As a half subtractor also
  2. has two outputs CH = x x y and Sn = x ⊕ y for two inputs x and y
  3. has two outputs CH = x + y and SH = x ⊕ y for two inputs x and y
  4. is a combinational circuit
Which of the statements given above is/are correct?
1, 3, 4
1, 2, 4
4 only
2 and 3
Answer: Option
Explanation:

Let two bit, verify S and B will same.

37.
The expression given is F(A, B, C, D, E, F, G, H) = Σ(33, 48, 102, 158, 222, 229, 233, 243, 255); then the __________ and __________ minterms are grouped together into dual and variable __________ is reduced using the dual
243, 233, D
222, 158, B
243, 255, A
229, 243, E
Answer: Option
Explanation:

We use Q-McCluskyey method of redaction

We can observe that minterms 158 and 222 can be grouped to reduce the variable 'B'.

38.
If for certain x(t), the Fourier transform is:

Then for x(2t) the Fourier transform will be:
same as X(jω)
Answer: Option
Explanation:

Using scaling property

.

39.
The circuit I in figure is
1 mA
4 mA
8 mA
10 mA
Answer: Option
Explanation:

Current in the circuit is

[2 v at '+' terminal and '-' terminal will be same].

40.
In x = the value of x is
10
25
36
44
Answer: Option
Explanation:

= (10)2 + (10)3 + ... + (10)8 + (10)9

= (2)10 + (3)10 + .... + (8)10 + (9)10

= 2 + 3 + ... + 8 + 9 = 44.

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