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Automatic Control Systems

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

Either (a) or (b)
Rotor
Partly on stator and partly on rotor
Stator

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Automatic Control Systems
A system is highly oscillatory if

Gain margin is high
Gain margin is close to 1
Gain margin is close to 1 or phase margin is zero
Gain margin is high and phase margin is 180°

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Automatic Control Systems
Transport lag usually exists in

Pneumatic systems
Hydraulic systems and thermal systems
Thermal, hydraulic and pneumatic systems
Thermal systems

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Automatic Control Systems
The sensor generally used in incremental optical encoder is

LED
LCD
Photodiode
Either (a) or (b)

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Automatic Control Systems
In the field controlled motor the entire damping comes from

Field resistance
Motor friction and load
Armature resistance
Back emf

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Automatic Control Systems
In force current analogy, displacement x is analogous to

Electrostatic energy
Voltage
Magnetic flux linkage
Charge

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