In a feed-back control system G and H denote open loop and close loop transfer functions respectively. The output-input relationship is_____________?

Related Mcqs:

1. The root locus plot of the roots of the characteristics equation of a closed loop system having the open loop transfer function K (s + 1)/[2 (2s + 1) (3s + 1)] will have a definite number of loci for variation of K from 0 to ∞. The number of loci is_______________?

   A. 1
   B. 2
   C. 3
   D. 4

2. In a closed loop system, the process to be controlled is an integrating process with transfer function 1/2s. The controller proposed to be used in an integral controller with transfer function 1/T1s. When a step change in set point is applied to such a closed loop system, the controlled variable will exhibit__________________?

   A. Overdamped response
   B. Underdamped response
   C. Undamped response
   D. Unstable response

3. ____________ stability method uses open loop transfer function?

   A. Nyquist
   B. Mikhailov
   C. Ruth
   D. None of these

4. The open loop transfer function of a control system is KR/(1 + TS). This represents ______________?

   A. A first order system
   B. Dead time system
   C. A first order time lag
   D. A second order system

5. The open loop transfer function of a process is K [{(s + 1) (s + 4)}/{(s + 2) (s + 3)}]. In the root locus diagram, the poles will be at ___________________?

   A. -1, -4
   B. 1, 4
   C. -2, -3
   D. 2, 3

6. Identify an unbounded input from inputs whose transfer functions are given below______________?

   A. 1
   B. 1/S
   C. 1/S2
   D. 1/(S2 + 1)

7. According to Bode stability criterion, a system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at frequency for which phase lag is_________________?

   A. 0°
   B. 45°
   C. 90°
   D. 180°

8. “A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency.” This is _______________ criterion?

   A. Bode stability
   B. Nyquist
   C. Routh stability
   D. None of these

9. For two non-interacting first order systems connected in series, the overall transfer function is the ______________ of the individual transfer functions?

   A. Product
   B. Ratio
   C. Sum
   D. Difference

10. The characteristic equation for the control system with a closed loop transfer function G1/1 + G2 is given by 1 + G2 = 0. The characteristic equation for the control system_________________?

    A. Depends only upon the open loop transfer function
    B. Determines its stability
    C. Is the same for set point or load changes
    D. All A , B & C.