Electrical Engineering MCQs

Page No. 58

In a stable control system backlash can cause which of the following ?


aUnderdamping


bOverdamping


cPoor stability at reduced values of open loop gain


d Low-level oscillations



A controller, essentially, is a________________?


asensor


b clipper


c comparator


damplifier


View Answer comparator

Which of the following statements is correct for any closed loop system ?


aAll the co-efficients can have zero value


bAll the co-efficients are always non-zero


c Only one of the static error co-efficients has a finite non-zero value


dNone of the above



The transient response, with feedback system_____________?


arises slowly


b rises quickly


cdecays slowly


d decays quickly


View Answer decays quickly

Which of the following statements is correct for a system with gain margin close to unity or a phase margin close to zero ?


aThe system is relatively stable


bThe system is highly stable


c The system is highly oscillatory


dNone of the above



The second derivative input signals modify which of the following ?


aThe time constant of the system


bDamping of the system


cThe gain of the system


dThe time constant and suppress the oscillations



increases the steady state accuracy?


aIntegrator


bDifferentiator


cPhase lead compensator


d Phase lag compensator


View Answer Integrator

Regenerative feedback implies feedback with_______________?


aoscillations


bstep input


cnegative sign


dpositive sign


View Answer positive sign

On which of the following factors does the sensitivity of a closed loop system to gain changes and load disturbances depend ?


aFrequency


bLoop gain


cForward gain


dAll of the above


View Answer All of the above

A control system with excessive noise, is likely to suffer from_______________?


a saturation in amplifying stages


b loss of gain


cvibrations


doscillations



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