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Electrical Engineering Objective Questions { Control System }



1. The transfer function of a system is 2s2 + 6s + 5(s + 1)2 (s + 2) The characteristic equation of the system is
A. 2s2 + 6s + 5 = 0
B. (s + 1)2 (s + 2) = 0
C. 2s2 + 6s + 5 + (s + 1)2 (S + 2) = 0
D. 2s2 + 6s + 5 ? (s + 1)2 (s + 2) = 0

2. By a suitable choice of the scalar parameter K, the system shown in the figure given below, can be made to oscillate continuously at a frequency of
A. 1 rad/s
B. 2 rad/s
C. 4 rad/s
D. 8 rad/s

3. For a gain constant K, the phase-lead compensator
A. reduces the lope of the magnitude curve in the entire range of frequency domain
B. decrease the grain cross-over frequency
C. reduce the phase margin
D. reduce the resonance peak M.

4. Give a system represented by equations 0 x + [1] x=[_2 1_2 _3]0 ans y =1101x The equivalent transfer function representation G(s) of the system is 1
A. G(s) = 2s +5s+21
B. G(s) ? s2
C.+ 3s + 2 3
D.C G(s) ? 2s + 3s + 23

5. Consider the following properties attributed to state model of a system : 1. State model is unique 2. State model can be derived from the system transfer function 3. State model can be derived from time variant systems. Of these statements
A. 1, 2 and 3 are correct
B. 1 and 2 are correct
C. 2 and 3 are correct
D. 1 and 3 are correct

6.  The ac motor used in servo applications is a
A. single-phase induction motor
B. two-phase induction motor
C. three-phase induction motor
D. synchronous motor

7.  In position control systems, the device used for providing rate-feedback voltage is called
A. potentiometer
B. Synchro-transmitter
C. synchro-transformer
D. tachogenerator

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