List of top Instrumentation Engineering Questions on Control Systems

If the characteristic equation of a closed-loop system is $s^2 + 2s + 2 = 0$, then the system is:
The Bode plot of the transfer function $G(s) = 5$ is:
The type denotes the number of:
Which of the following controller produces zero offset?
The breakaway point of the root locus on the real axis for a closed loop system with a loop gain \( G(s) = \frac{K(s+10)}{(s+2)(s+5)} \) is:
The phase margin of the system for which the loop gain \( GH(j\omega) = \frac{A_1}{(j\omega + 1)^3} \) is:
An optical fiber is characterized by
A step index optical fiber whose refractive indices of the core and cladding are 1.44 and 1.40 respectively, is surrounded by air. Its numerical aperture is
An optical fiber has a refractive index of 1.641 for the core and 1.422 for the cladding.
The critical angle above which a ray will be totally internally reflected is
The coherence length of the He-Ne laser beam is 120 cm. Its coherence time in seconds is:
Collimated light beams from a He-Ne laser and a sodium vapor lamp are focused using a lens.
The size of the spot at the focal point due to the laser is relatively smaller because
If the transfer function of a system is \( G(s) = \frac{A}{s^2 + \omega^2} \), then the steady state gain of the system to a unit step input is:
Consider a unity feedback control system whose forward path transfer function is \( G(s) = \frac{K}{s^2} \). The steady state error for a step input is:
A temperature control system is usually very sluggish. To improve its dynamics:
A first order system with a proportional controller exhibits an offset to step input. The offset can be reduced by:
An integral controller is used to:
The system \( G(s) = \frac{0.8}{s^2 + s - 2} \) is subjected to a step input. The system output \( y(t) \) as \( t \rightarrow \infty \) is:
If the open loop transfer function of the negative feedback control system is \[ G(s)H(s) = \frac{k}{(s+1)^3}, \] then the gain $k$ for a closed loop pole at \[ \left( \frac{1}{2} + j\frac{\sqrt{3}}{2} \right) \] is:
A transfer function has two zeros at infinity. Then the relation between the numerator degree (N) and the denominator degree (M) of the transfer function is:
The transfer function of the system is the Laplace transform of its

The figure shown below is a circuit diagram of ____ controller?

Zero initial condition for a system means ____ .
Derivative error compensation:
Which one of the following controllers produces the output in three terms?
Feedback control systems are: