AUTOMATIC CONTROL SYSTEMS QUIZ

M circles are symmetrical with respect to

M = 1 straight line and real axis

M = 1 straight line and imaginary axis

M = 1 straight line

Real and imaginary axis

TRUE ANSWER : ?
YOUR ANSWER : ?

Magnetic amplifier is used for

Voltage amplification

Frequency amplification

Power amplification

Current amplification

TRUE ANSWER : ?
YOUR ANSWER : ?

Lag compensation permits a high gain at low frequencies.

True

False

TRUE ANSWER : ?
YOUR ANSWER : ?

The permanent magnet field system of brushless dc servo- motor is generally on

Partly on stator and partly on rotor

Stator

Either (a) or (b)

Rotor

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following can be used as a rotating amplifier in a control system? 1. Amplidyne 2. Separately excited dc generator 3. Synchro 4. Self excited dc generator

3 and 4

1, 2 and 3

All

1 and 2

TRUE ANSWER : ?
YOUR ANSWER : ?

Nichol’s chart is symmetric about – 180° axis.

False

True

TRUE ANSWER : ?
YOUR ANSWER : ?

Integral control action

May lead to oscillatory response

Both (a) and (b)

Neither (a) nor (b)

Removes offset

TRUE ANSWER : ?
YOUR ANSWER : ?

Gain margin and phase margin can be determined from Bode plots as well as Nyquist plot.

True

False

TRUE ANSWER : ?
YOUR ANSWER : ?

A lead compensator

Increases the stability margin and speeds up the transient-response.

None of these

Speeds up the transient response

Increases the stability margin

TRUE ANSWER : ?
YOUR ANSWER : ?

Bandwidth is proportional to speed of response.

False

True

TRUE ANSWER : ?
YOUR ANSWER : ?

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