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Neha Agarwal
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Quote Neha Agarwal Replybullet Topic: Signals and Systems sample questions GATE Exam
    Posted: 09Jan2007 at 6:28pm


Que. 1 For a secound order system  with the close loop transfer function     
                T(s)= 9/[s^2+4s+9] the setting time for 2% band in secounds 
is
A
1.5
B
2.0
C
3.0
D
4.0

Que. 2 The Nyquist sampling interval,for the signal sinc(700t)+sinc(500t) is
A
1/350 sec
B
(pi)/350 sec
C
1/700 sec
D
(pi)/175 sec

Que. 3 A video transmission system transmitts 625 picture frames/sec. Each frame 
consist of a       (400*400) pixel grid with 64 intensity levals/pixal.The 
data rate of the system is
A
16Mbps
B
100Mbps
C
600Mbps
D
6.4Mbps

Que. 4 Let x and y be two statistically independent random variables uniformly 
distributed in the ranges (-1,1)and(-2,1) respectively let Z=x+y, then 
the probality that is
A
0
B
1/6
C
1/3
D
1/12

Que. 5 The gain margin and the phase margin of a feedback system with G(s)H(s)=s/(s+100)^3 
are
A
0db,0degree
B
infinite,infinite
C
infinite,0degree
D
88.5dB,infinite

Que. 6 For the polynomial P(s)=s^5+s^4+2s^3+2s^2+3s+15,the number of root which 
is right halfe of the s-plane is
A
4
B
2
C
3
D
1

Que. 7 Laplace transform of tsin at is
A
2as/[(s^2)+(a^2)]^2
B
2a/[(s^2+a^2)]^2
C
2s/[(s^2)+(a^2)]^2
D
a/[(s^2+a^2)]^2

Que. 8 1Khz sinusoidal signal is ideally sampled at 1500 samples/sec and the 
sasmpled signal is passed though an ideal low-pass filter with cutoff 
freq. 800hz the output signal has freq.
A
0 hz
B
0.75Khz
C
0.5Khz
D
0.25Khz

Que. 9 A system function has a pole at s=0 and a zero at s=-1 the constant multiplier 
is unity for an exitation cos t, the steady state response is given by
A
[(sqrt)2] cos(t+45degree)
B
[(sqrt)2] cos(t-45degree)
C
cos45degree
D
1/[(sqrt)2] cos(t+45degree)

Que. 10 For a liner transfer function of the variable, the transfer function of 
the system
A
changes
B
does  not change
C
has no relation at all
D
depends on other fectors also

Que. 11 Asignal phase voltage source square wave inverter feeds pure inductive 
load.The waveform of the load current will be
A
sinusodal
B
rectangular
C
trapezoidal
D
triangular

Que. 12 The unit ckt of the Nyquist plot transforms into 0dB line of the amplitude 
plot the bode digram at
A
0 frequency
B
low frequency
C
high frequency
D
any frequency

Que. 13 An instruction used to set the carry flag in a computer can be classified 
as
A
data transfer
B
arithmetic
C
logical
D
program control

Que. 14 a system function H(s)=V(s)/I(s)=s+2/2s+1         the system is at rest 
for t<0.i(t)=unit step. the value of v(t) at t=0 and t=infinite respectively 
are
A
2 and 1/2
B
1/2 and 2
C
0 and indetermined
D
2 and indetermined

Que. 15 H(s)=V(s)/I(s)=4s+6/s+2, i(t)=unit step function. v(t) as t->infinite 
is given by
A
0
B
3
C
4
D
infinite




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