Electronics and Communication Engineering  Automatic Control Systems
Exercise :: Automatic Control Systems  Section 6
46. 
The transfer function G(s) of a PID controller is 
Answer: Option A
Explanation:

47. 
In a proportional plus integral control action 
A. 
proportional gain K_{p} is adjustable but integral time T_{i} is constant  B. 
proportional gain K_{p} is adjustable but integral time T_{i} is adjustable  C. 
both proportional gain K_{p} and integral time T_{i} are adjustable  D. 
both proportional gain K_{p} and integral time T_{i} are constant 
Answer: Option C
Explanation:

48. 
An RLC series circuit has
If poles p_{1} and p_{1}* are close to jω axis, then 
A. 
resonant frequency is high  B. 
Q is high  C. 
bandwidth is large  D. 
Q is low 
Answer: Option C
Explanation:

49. 
A reactance function 
A. 
has a pole at origin  B. 
has a zero at origin  C. 
may have a pole or zero at origin  D. 
has a pole or zero at origin and a pole or zero at infinity 
Answer: Option D
Explanation:

50. 
Given figure shows a magnitude Bode plot. The transfer function for this plot is

Answer: Option C
Explanation:
