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Electronics and Communication Engineering - Exam Questions Papers

Exercise : Exam Questions Papers - Exam Paper 12
41.
The system shown in figure remains stable when :
k £ - 1
-1 < k < 1
l < k < 3
k > 3
Answer: Option
Explanation:

Pi = 1 x k x s-1 x 1 ⇒

, L2 = k x s-1

System will be stable when k - 3 > 0 or k > 3.

42.
The mechanical system shown below has its pole(s) at:
- K/D
- D/K
- DK
0, - K/D
Answer: Option
Explanation:

Kx(s) - Ky(s) = Dsy(s)

Kx(s) = Dsy(s) + Ky(s)

43.
The step error coefficient of a system with unity feedback is :
1/6
∞
0
1
Answer: Option
Explanation:

kp = s → 0 G(s)H(s).

44.
The following k-map implements
BCD to Decimal Decoder
Decimal to BCD Encoder
1 of 10 Decoder
(a) and (c)
Answer: Option
Explanation:

As the K-map reveals W, X, Y, Z are the input lines to the device and D0 to D9 are the output lines which get activated depending upon the input combinations.

As seen from k-map for W, X, Y, Z from 0000 to 1001 we have D0 to D9 outputs activated respectively.

This operation is performed by BCD to Decimal decoder.

Also it is called as 1 off 10 decoder, as only 1 of 10 output line is high.

45.
The Z-transform of a signal is given by its final value is __________ .
infinite
1/4
zero
1
Answer: Option
Explanation:

Final value

Final value

Final value

.

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