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Automatic Control Systems

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
For any transfer function, the constant phase angle loci are

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

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Automatic Control Systems
Which dc servomotor requires strongest permanent magnet?

Surface wound armature
Either A or B
Surface wound with stationary rotor
Slotted armature

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Automatic Control Systems
Transport lag usually exists in

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

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

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

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Automatic Control Systems
Nichols chart consists of

Constant phase angle loci
None of these
Magnitude and phase angle loci in log-magnitude versus phase diagram
Constant magnitude loci

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