Control system lab

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

• Closed loop system

• Semi closed loop system

• Open system

• None of the above

In closed loop control system, with positive value of feedback gain the overall gain of the system will

• decrease

• Increase

• be unaffected

• any of the above

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

• Servomechanism

• Feedback

• Output pattern

• Input pattern

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

• The gain of the system should be decreased.

• The gain of the system should be increased

• The number of poles to the loop transfer function should be increased

• The number of zeros to the loop transfer function should be increased

A.C. servomotor resembles

• two phase induction motor

• Three phase induction motor

• direct current series motor

• universal motor

Transfer function of a system is used to calculate which of the following ?

• The order of the system

• The time constant

• The output for any given input

• The steady state gain

If the gain of the critical damped system is increased it will behave as

• oscillatory

• critically damped

• over damped

• under damped

• none of the above

Best method to determine stability and transient response of the system is

• Bode plot

• Signal flow graph

• Nyquist plot

• Root locus

If poles of system are lying on the imaginary axis in s-plane, the system will be

• Unstable

• Marginally stable

• Conditionally stable

• Unstable

If a pole is added to a system it causes

• Lag compensation

• Lead compensation

• Lead-lag compensation

• None of these