1
GATE EE 2000
MCQ (Single Correct Answer)
+1
-0.3
A unity feedback system has open loop transfer function $$G(s).$$ The steady-state error is zero for
A
step input and type $$–1$$ $$G(s)$$
B
ramp input and type $$–1$$ $$G(s)$$
C
step input and type $$-$$ $$G(s)$$
D
ramp input and type $$-$$ $$0$$ $$G(s)$$
2
GATE EE 1998
MCQ (Single Correct Answer)
+1
-0.3
The output of a linear time invariant control system is $$c(t)$$ for a certain input $$r(t).$$ If $$r(t)$$ is modified by passing it through a block whose transfer function is $${e^{ - s}}$$ and then applied to the system, the modified output of the system would be
A
$${{c\left( t \right)} \over {1 + {e^t}}}$$
B
$${{c\left( t \right)} \over {1 + {e^{ - t}}}}$$
C
$$c\left( {t - 1} \right)u\left( {t - 1} \right)$$
D
$$c\left( t \right)\,\,u\left( {t - 1} \right)$$
3
GATE EE 1997
MCQ (Single Correct Answer)
+1
-0.3
Introduction of integral action in the forward path of a unity feedback system result in a
A
marginally stable system
B
system with no steady state error
C
system with increased stability margin
D
system with better speed of response
4
GATE EE 1996
MCQ (Single Correct Answer)
+1
-0.3
The unit - impulse response of a unity - feedback control system is given by $$c\left( t \right) = - t{e^{ - t}} + 2\,\,{e^{ - t}},\,\left( {t \ge 0} \right)$$ the open loop transfer function is equal to
A
$${{s + 1} \over {{{\left( {s + 2} \right)}^2}}}$$
B
$${{2s + 1} \over {{s^2}}}$$
C
$${{s + 1} \over {{{\left( {s + 1} \right)}^2}}}$$
D
$${{s + 1} \over {{s^2}}}$$
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