Exercise: Exam Question Papers

Questions for: Exam Question Papers

The steady state error of a stable type 0 unity feedback system for a unit step function is :
A:
0
B:
C:
∞
D:
Answer: B

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A fair coin is tossed independently four times. The probability of the event "the number of time heads shown up is more than the number of times tails shown up" is
A:
B:
C:
D:
Answer: D

4 heads and 0 tail 3 head and 1 tail

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A material has conductivity of 105 mho/m and permeability of 4p x 10-7 H/m. The skin depth at 9 GHz is
A:
1.678 Ξm
B:
26 Ξm
C:
17 Ξm
D:
32.32 Ξm
Answer: C

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An antisymmetric filter having odd number of coefficient may have a performance as
A:
low pass
B:
high pass
C:
band pass
D:
all pass
Answer: D

Consider an anti-symmetric filter response with order 5.

h(n) = [h(2), h(1), h(0), - h(1), - h(2)]

We know, H(0) = addition of all component values.

Hence H(0) = h(0)

Similarly H(p) = addition of all component values with alternate negative sign.

= h(2) - h(1) + h(0) + h(1) - h(2) = h(0)

Hence we get all pass filter.

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A periodic rectangular signal, x(t) has the waveform shown in the given figure. Frequency of the fifth harmonic of its spectrum is __________
A:
200 Hz
B:
250 Hz
C:
400 Hz
D:
1250 Hz
Answer: D

The periodic time = 4 ms = 4 x 10-3 s

âˆī The fundamental frequency

âˆī Frequency of the 5th harmonic

= 250 x 5 = 1250 Hz.

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