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Control Systems

Study 100 Electrical Engineering MCQs with correct answers and explanations.

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51Electrical EngineeringMedium

A closed loop system is distinguished from open loop system by which of the following?

AInput pattern

BOutput pattern

CFeedback

DServomechanism

Correct answer

C. Feedback

Explanation

The correct answer is Feedback.

52Electrical EngineeringMedium

In an automatic control system which of the following elements is not used?

AError detector

BOscillator

CSensor

DFinal control element

Correct answer

B. Oscillator

Explanation

The correct answer is Oscillator.

53Electrical EngineeringMedium

The transient response, with feedback system________?

Adecays slowly

Brises slowly

Cdecays quickly

Drises quickly

Correct answer

C. decays quickly

Explanation

The correct answer is decays quickly.

54Electrical EngineeringMedium

A control system in which the control action is somehow dependent on the output is known as________?

ASemiclosed loop system

BNone of the above

COpen system

DClosed loop system

Correct answer

D. Closed loop system

Explanation

The correct answer is Closed loop system.

55Electrical EngineeringMedium

Which of the following can be measured by the use of a tachogenerator?

ASpeed and acceleration

BAcceleration

CDisplacement

DNone of the above

ESpeed

Correct answer

E. Speed

Explanation

The correct answer is Speed.

56Electrical EngineeringMedium

________can be extended to systems which are time-varying?

ATransfer functions

BBode-Nyquist stability methods

CRoot locus design

DState model representatives

Correct answer

D. State model representatives

Explanation

The correct answer is State model representatives.

57Electrical EngineeringMedium

Which of the following should be done to make an unstable system stable?

AThe gain of the system should be decreased

BThe gain of the system should be increased

CThe number of zeros to the loop transfer function should be increased

DThe number of poles to the loop transfer function should be increased

Correct answer

B. The gain of the system should be increased

Explanation

The correct answer is The gain of the system should be increased.

58Electrical EngineeringMedium

In order to increase the damping of a badly underdamped system which of following compensators may be used?

ABoth A. and B.

BPhase-lag

CPhase-lead

DNone of the above

EEither A. and B.

Correct answer

C. Phase-lead

Explanation

The correct answer is Phase-lead.

59Electrical EngineeringMedium

An amplidyne can give which of the following characteristics?

AConstant voltage

BConstant current, constant voltage and constant power

CNone of the above

DConstant current as well as constant voltage

EConstant current

Correct answer

B. Constant current, constant voltage and constant power

Explanation

The correct answer is Constant current, constant voltage and constant power.

60Electrical EngineeringMedium

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

ANone of the above

BThe system is highly stable

CThe system is highly oscillatory

DThe system is relatively stable

Correct answer

C. The system is highly oscillatory

Explanation

The correct answer is The system is highly oscillatory.

Which of the following should be done to make an unstable system stable?

AThe gain of the system should be decreased

BThe gain of the system should be increased

CThe number of zeros to the loop transfer function should be increased

DThe number of poles to the loop transfer function should be increased

Correct answer

B. The gain of the system should be increased

Explanation

The correct answer is The gain of the system should be increased.

An amplidyne can give which of the following characteristics?

AConstant voltage

BConstant current, constant voltage and constant power

CNone of the above

DConstant current as well as constant voltage

EConstant current

Correct answer

B. Constant current, constant voltage and constant power

Explanation

The correct answer is Constant current, constant voltage and constant power.