CONTROL SYSTEMS QUIZ

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

1 and 2

3 and 4

All

1, 2 and 3

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In force current analogy, displacement x is analogous to

Magnetic flux linkage

Charge

Electrostatic energy

Voltage

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Nichols chart consists of

Constant magnitude loci

Constant phase angle loci

Magnitude and phase angle loci in log-magnitude versus phase diagram

None of these

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Temperature is analogous to

Charge

Flux

Voltage

None of these

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A system is highly oscillatory if

Gain margin is close to 1 or phase margin is zero

Gain margin is high

Gain margin is high and phase margin is 180°

Gain margin is close to 1

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The effect of adding poles and zeros can be determined quickly by

Nichols chart

Bode plot

Nyquist plot

Root locus

TRUE ANSWER : ?
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In root locus analysis the breakaway and break in points

Always occur in complex conjugate pairs

None of these

Either lie on the real axis or occur in complex conjugate pairs

lie on the real axis

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The sensor generally used in incremental optical encoder is

LED

Photodiode

LCD

Either (a) or (b)

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A lag compensator

Speeds up the transient response of the system

Improves steady state behavior of the system

Improves steady state behavior and preserves the transient response of the system

Improves steady state behavior and speeds up the transient response of the system

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Which dc servomotor requires strongest permanent magnet?

Surface wound with stationary rotor

Surface wound armature

Either A or B

Slotted armature

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