| Que.
1 |
A driving point impedance Z(s)=V(s)/I(s)=s+1/s+2. the system is initally
at rest for a voltage a signal at unit step, the current i(t) through
Z is given by |
| A |
|
1-e^-r |
| B |
|
2-e^-r |
| C |
|
2-2e^-r |
| D |
|
1/2e^-r |
|
Que. 2
|
For the random variable x following the probality density function p(x) shows in fig. the mean and the variance are respectively
^
| P(x)
|
1/4 _____|___________
| | | |
| | |
___|____|___________|_______ x
-1 0 3 ----> |
| A |
|
1/2 and 2/3 |
| B |
|
1 and 4/3 |
| C |
|
1 and 2/3 |
| D |
|
2 and 4/3 |
|
Que. 3
|
If R is the source resistance the output resistance of an emittor follower
using the s simplified hybrid model would be |
| A |
|
h(ie)+R(s) /1+h(fe) |
| B |
|
h(ie) +R(s) /h(fe) |
| C |
|
R(s) +1/h(fe) |
| D |
|
1/h(fe) |
|
Que. 4
|
A unit feedback system has an open-loop transfer function of
G(s)=1000/s(s+10)^2 the magnitude of G(jw) in
the DB at an angular frequency at w= 20 red/sec |
| A |
|
0dB |
| B |
|
10dB |
| C |
|
20dB |
| D |
|
none of the above |
|
Que. 5
|
A linear discreate time system has the characteristic equation Z^3-0.81Z=0.the
system |
| A |
|
is stable |
| B |
|
is marginally stable |
| C |
|
is unstable |
| D |
|
stability can not be assessed from the given information |
|
f
Que
6. |
H(s)=V(s)/I(s) = s+3/(s+3)^2 .i(t) is unit step.V(t)
is steady state is given by |
| A |
|
3/2 |
| B |
|
3/4 |
| C |
|
1 |
| D |
|
0 |
|
Que 7.
|
In case of synchro error dector,the electrical zreo position of control
transformer is obtained when angular displacement between rotors is |
| A |
|
0 |
| B |
|
45degree |
| C |
|
90degree |
| D |
|
180degree |
|
Que. 8
|
A second order differential equation is given by
d^2x/dt^2+5dx/dt+7x=7y The undamped natural freq. and damping ratio are |
| A |
|
1,5 |
| B |
|
5,7 |
| C |
|
1,[(sqrt)7] |
| D |
|
[(sqrt)7],0.94 |
|
Que. 9
|
An amplifier has a bandwidth of 20khz and a midband gain of 50 without
feedback.If a -ve feedback of 1% is applied.then bandwidth with feedback
is |
| A |
|
13.3khz |
| B |
|
30khz |
| C |
|
10khz |
| D |
|
40khz |
|
Que. 10
|
A unity feedback system has the plan transfer function Gp
(s)=1/[(s+1)(2s+1) ] an integral controller with transfer function G
(s)=k/s is placed in the feedforward path the of the feedback system.
the value of k such that the compensated system has an open loop gain
margin of 2.5 |
| A |
|
3/5 |
| B |
|
5/3 |
| C |
|
2 |
| D |
|
none of the above |
-------------
For more papers visit:
http://onestopgate.com/gate-preparation// - http://onestopgate.com/gate-preparation//
|