Control Systems Mid - II, April - 2012

1.As the value of gain K increases the system stability
  • increases
  • reduces
  • depends
  • none
Answer: B
2.The more positive phase margin, ______ is the stability of the system.
  • more
  • less
  • depends
  • doesnt depend
Answer: A
3.Using bode plot, the following can be determined
  • cutoff frequency
  • bandwidth
  • gain margin
  • all the above
Answer: D
4.The poles of 1 G(s)H(s) are
  • poles of G(s)H(s)
  • open loop poles
  • both
  • none
Answer: C
5.The lag compensator is basically a filter
  • high pass
  • band pass
  • band reject
  • low pass
Answer: D
6.The c.s given by G(s)H(s)=10/(s 5)(s^2 2s 2) is
  • unstable
  • stable
  • marginally stable
  • depends
Answer: B
7.The system in which output is not only dependent on input but also on in initial conditions is called system
  • static
  • dynamic
  • zero memory
  • none
Answer: B
8.In a state space matrix the matrix D is also called as matrix
  • system
  • evolution
  • control
  • direct transmisssion
Answer: D
9.S-1:The state model of a system is not unique S-2:transfer function of a state model is unique
  • S-1 and S-2 are true
  • S-1 true and S-2 false
  • S-1 false and S-2 false
  • S-1 false and S-2 true
Answer: A
10.The zero input response of system is also called as response.
  • free
  • natural
  • unforced
  • all the above
Answer: D
11.The slope of resultant magnitude curve near cutoff frequency is called ------------------ rate.
Answer: cut off
12.The amount of additional phase angle lag which can be introduced in system till system reaches on verge of instability is called -----------------------.
Answer: phase margin
13.The unity feedback system G(s)=80/s(s 2)(s 20) the no. of simple poles are ---------------.
Answer: 2
14.The zeros of 1 G(s)H(s) are ----------------- poles of the system.
Answer: closed loop
15.According to mapping theorem the encirclement of origin N= ------------------------.
Answer: Z-P
16.The alteration of system using additional suitable devices is called -------------------- of a control system.
Answer: compensation
17.The lag compensator allow high gain at ---------------- frequency.
Answer: low
18.The characteristics equation of a state space model is given by ------------------.
Answer: SI-A=0
19.The method of obtaining state space model using canonical variables is also called --------------- programming.
Answer: parallel
20.The roots of characteristic equation are called ---------------- values of matrix.
Answer: eigen