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Automatic Control Systems

Automatic Control Systems
Which of the following is used to obtain output position in a position control system?

Strain gauge
Thermistor
Synchro
Load cell

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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
Which control action can never be used alone?

Derivative
Both (b) and (c)
Proportional
Integral

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Automatic Control Systems
Nyquist stability criterion uses open loop frequency response characteristics.

True
False

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

Back emf
Armature resistance
Motor friction and load
Field resistance

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

Charge
Electrostatic energy
Magnetic flux linkage
Voltage

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