Question

High power amplification is achieved by the use of
1. Magnetic amplifier
2. DC amplifier
3. DC generator
4. Amplidyne

Answer 1

Correct Answer - Option 2 : DC amplifier

Magnetic amplifier:

• The magnetic amplifier is an electromagnetic device for amplifying electrical signals.
• Magnetic amplifiers were used to control large high-power alternators by turning them on and off for telegraphy or to vary the signal for voice modulation.

 

Amplidyne:

• An amplidyne is an electromechanical amplifier. It consists of an electric motor driving a DC generator.
• The signal to be amplified is applied to the generator's field winding, and its output voltage is an amplified copy of the field current.
• The amplidyne is used in industry in high power servo and control systems, to amplify low power control signals to control powerful electric motors.

 

DC amplifier:

• A direct-coupled amplifier or DC amplifier is a type of amplifier in which the output of one stage of the amplifier is coupled to the input of the next stage in such a way as to permit signals with zero frequency, also referred to as direct current, to pass from input to output.
• High power amplification is achieved by using this amplifier. These amplifiers can be used in controlling of Jet engine, regulators in power supply. etc