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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)
Partly on stator and partly on rotor
Stator
Rotor

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Automatic Control Systems
For any transfer function, the constant phase angle loci are

Either (a) or (b)
A family of circles
A family of straight lines
Neither (a) nor (b)

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Automatic Control Systems
DC tachogenerator can be used in

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

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

Armature resistance
Motor friction and load
Back emf
Field resistance

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

Synchro
Load cell
Thermistor
Strain gauge

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