| Que. 1 |
Sinusoidal oscillators are |
| A |
|
stable |
| B |
|
unstable |
| C |
|
margin stable |
| D |
|
conditionally stable |
|
| Que. 2 |
If thegain of the open loop system is doubled, the gain margin |
| A |
|
is not affected |
| B |
|
gets doubled |
| C |
|
becomes half |
| D |
|
become one fourth |
|
| Que. 3 |
Phase margin of a system is used to specified |
| A |
|
relative stability |
| B |
|
absolute stability |
| C |
|
time response |
| D |
|
freq. response |
|
| Que. 4 |
The feedback system with charecteristic equation s^4+20Ks^3+5s^2+10s+15=0 |
| A |
|
stable for all value of k |
| B |
|
stable for +ive value of k |
| C |
|
stable for infinity > k > 7 |
| D |
|
unstable for all value of k |
|
| Que. 5 |
In the above system if a=.1, the steady state error to unity ramp input
will be |
| A |
|
.16 |
| B |
|
.25 |
| C |
|
.35 |
| D |
|
.49 |
|
| Que. 6 |
If the charecteristic equation of a close loop system is 1+k/s(s+1)(s+2)=0,the
centroid at the asymptotes in root locus will be |
| A |
|
0 |
| B |
|
2 |
| C |
|
-1 |
| D |
|
-2 |
|
| Que. 7 |
The magnitude freq. response of a control system.the value of w1 and w2
are respectively |
| A |
|
10,200 |
| B |
|
20,200 |
| C |
|
20,400 |
| D |
|
100,400 |
|
| Que. 8 |
A control system whose step response is -0.5(1+e^-2t) is cascaded in another
control block whose impulse response is e^-t the transfer function of
the cascaded combination is |
| A |
|
1/(s+1)(s+2) |
| B |
|
1/s(s+1) |
| C |
|
1/s(s+2) |
| D |
|
0.5/(s+1)(s+2) |
|
| Que. 9 |
The error response of a secound order system to a step input is obtained
as E(t)=1.66e^-st sin(6t+37degree) the damping ratio is |
| A |
|
0.4 |
| B |
|
0.5 |
| C |
|
0.8 |
| D |
|
1.0 |
|
| Que. 10 |
In a linear system an input of 5sin wt produces an output of 10coswt
the output corresponding to input 10cos wt will be equal to |
| A |
|
+5sinwt |
| B |
|
-5sinwt |
| C |
|
+20 sinwt |
| D |
|
-20 sinwt |