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Automatic Control Systems

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

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

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Automatic Control Systems
A conditionally stable system is stable for the value of gain between two critical values. It is unstable if

Both A and B
The gain is increased beyond upper critical value
The gain is decreased below lower critical value
None of these

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Automatic Control Systems
A lead compensator

None of these
Speeds up the transient response
Increases the stability margin
Increases the stability margin and speeds up the transient-response.

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Automatic Control Systems
In root locus analysis the breakaway and break in points

Either lie on the real axis or occur in complex conjugate pairs
Always occur in complex conjugate pairs
None of these
lie on the real axis

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

Back emf
Motor friction and load
Armature resistance
Field resistance

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Automatic Control Systems
Transport lag usually exists in

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

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