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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)
Rotor
Partly on stator and partly on rotor
Stator

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Automatic Control Systems
Magnetic amplifier is used for

Frequency amplification
Voltage amplification
Power amplification
Current amplification

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Automatic Control Systems
M circles are symmetrical with respect to

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

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

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

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Automatic Control Systems
Lag compensation permits a high gain at low frequencies.

False
True

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Automatic Control Systems
Transport lag usually exists in

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

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