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Automatic Control Systems

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

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

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Automatic Control Systems
DC tachogenerator can be used in

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

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Automatic Control Systems
The relative stability of a system is given by

Gain margin alone
Phase margin alone
Both phase and gain margins
Either (a) or (b)

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Automatic Control Systems
Which of the following is open loop system?

Respiratory system of animal
System for controlling antirocket missiles
Aqualing
Wind screen wiper

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Automatic Control Systems
If poles lie in first quadrant, damping ratio is

More than 1
1
less than 1
Zero

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Automatic Control Systems
M circles are symmetrical with respect to

M = 1 straight line and imaginary axis
Real and imaginary axis
M = 1 straight line
M = 1 straight line and real axis

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