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Electronics and Communication Engineering - Exam Questions Papers

Exercise : Exam Questions Papers - Exam Paper 1
41.
For a = - 1, find the value of V2
∞
0
V1
none of the above
Answer: Option
Explanation:

V1 = i1R1 + i2R2

i1 + ai1 = i2

V2 = i2R2

Putting a = - 1

= 0 V.

42.
A unity-feedback control system has the open loop transfer function . If the input system is a unit ramp, the steady state error will be
0
0.5
2
infinity
Answer: Option
Explanation:

.

43.
For a given voltage, four heating coils will produce maximum heat when connected
all in parallel
all in series
with two parallel pairs in series
one pair in parallel with the other two in series
Answer: Option
Explanation:

.

44.
Denominator polynomial of a transfer function of certain network is:
s3 + s2 + 2s + 24
Then the network is:
stable
oscillatory
unstable
depends on numerator polynomial
Answer: Option
Explanation:

Routh array

There is negative number present in first column. Thus network is unstable.

45.
A TV picture is to be transmitted over a channel of 6 MHz bandwidth at a 35 dB S/N ratio. The capacity of the channel is
50 Mbps
100 Mbps
36 Mbps
72 Mbps
Answer: Option
Explanation:

W = B = Bandwidth

C = 6 x 106 x 12 = 72 Mbps.

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