Q.1
The input signals to control systems are not known fully ahead of time, the characteristics of control system which suddenly strain a control system are:
  • a) Constant velocity and acceleration
  • b) Sudden shock
  • c) Sudden change
  • d) All of the mentioned
Q.2
The characteristic equation of a control system is given by s(s+4)(s2+2s+s) + k(s+=What are the angles of the asymptotes for the root loci?
  • a) 0°, 180°, 300°
  • b) 0°, 120°, 240°
  • c) 60°, 180°, 300°
  • d) 120°, 180°, 240°
Q.3
Feedback control system is basically ______________
  • a) Band pass filter
  • b) Band stop filter
  • c) High pass filter
  • d) Low pass filter
Q.4
Which of the following is not a feature of a good control system?
  • a) Slow response
  • b) Sufficient power handling capacity
  • c) Good stability
  • d) Good accuracy
Q.5
A control system is generally met with the time response specifications:
  • a) Damping factor
  • b) Setting time
  • c) Steady state accuracy
  • d) All of the mentioned
Q.6
The open loop transfer function of a plant is given as, G(s) = 1/s2-If the plant is operated in unity feedback configuration, then the lead compensator that can stabilize the control system is:
  • a) 10(s+4)/(s+2)
  • b) 10(s+2)/(s+10)
  • c) 10(s+2)/(s+10)
  • d) 10(s-1)/(s+2)
Q.7
Controllers play which of the following role in the control system?
  • a) They act on the error signal coming out of the summing junction and output a suitable to the actuator
  • b) They try to reduce steady state error optimizes overshoot
  • c) They amplify the signals going to the actuator
  • d) All of the mentioned
Q.8
In control system excessive bandwidth is not employed because
  • a) It leads to slower time response
  • b) Noise is proportional to bandwidth
  • c) Noise is proportional to the square of the bandwidth
  • d) It leads to low relative stability
Q.9
What is the relation between output response and input signal in closed loop system?
  • a) Nonlinear
  • b) Linear
  • c) Exponential
  • d) Parabolic
Q.10
Which of the following is the input of a controller?
  • a) Signal of fixed amplitude not dependent on desired variable value
  • b) Desired variable value
  • c) Sensed signal
  • d) Error signal
Q.11
Which of the following are the not characteristics of the closed loop systems?
  • a) It does not have the ability to control the system transient response
  • b) It does not involve I/O measurements
  • c) It reduces the sensitivity of plant-parameter variations
  • d) It does not compensate for disturbance
Q.12
A control system whose step response is -0.5(1+e-2t) is cascaded to another control block whose impulse response is e-t. What is the transfer function of the cascaded combination?
  • a) 1/(s+1)s
  • b) 0.5/(s+1)(s+2)
  • c) 1/(s+2)(s+1)
  • d) 1/(s+3)
Q.13
Effect of feedback on sensitivity is minimum in:
  • a) Closed loop control system
  • b) Open and closed loop control systems
  • c) Open loop control system
  • d) None of the mentioned
Q.14
A particular control system yielded a steady state error of 0.for unit step input. A unit integrator is cascaded to this system and unit ramp input is applied to this modified system. What is the value of steady-state error for this modified system?
  • a) 0.15
  • b) 0.20
  • c) 0.25
  • d) 0.10
Q.15
Sampling is necessary ____________
  • a) Non automated control system
  • b) Automated control system
  • c) In complex control system
  • d) Where high accuracy is required
Q.16
Which of the motions in actuators are preferred?
  • a) Rotary
  • b) Stationary
  • c) Non-Stationary
  • d) Translator
0 h : 0 m : 1 s