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Automatic Control Systems

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

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

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Automatic Control Systems
The addition of a pole to the open loop transfer function pulls the root locus

To the right
To the left and making the system more stable
None of these
Towards right or left depending on the position of new pole

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Automatic Control Systems
DC tachogenerator can be used in

Both A and B
Position control system
Speed control system
Neither A nor B

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Automatic Control Systems
In force current analogue, mechanical mobility is analogous to

Conductance G
Impedance Z
Reactance X
Admittance Y

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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

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

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

Charge
Voltage
Electrostatic energy
Magnetic flux linkage

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