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Automatic Control Systems

Automatic Control Systems
Magnetic amplifier is used for

Current amplification
Frequency amplification
Power amplification
Voltage amplification

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Automatic Control Systems
Transport lag usually exists in

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

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

1
more than 1
less than 1
zero

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Automatic Control Systems
In force current analogue, mechanical mobility is analogous to

Admittance Y
Reactance X
Impedance Z
Conductance G

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

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

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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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