Electronic Principles and Circuits

When a negative voltage feedback is applied to an amplifier ,its voltage gain

• Is increased

• Is reduced

• Remains the same

• None of the above

The value of negative feedback fraction is always

• Less than 1

• More than 1

• Equal to 1

• None of these

A feed back circuit usually employs _______ Network

The gain of an amplifier with feed back is known as _______ gain

When voltage feedback (negative) is applied to an amplifier, its input impedance

• is decreased

• is increased

• remains the same

• none of the above

When current feed back (negative ) ia applied to an amplifier ,its input impedance

• is increased

• is decreased

• remains the same

• none of the above

Negative feedback is employed in

If voltage gain without feed back and feedback fractions are Av and Mv respective then gain with negative voltage feedback is

• AV/1-Av Mv

• Av/1+Av Mv

• 1+Av Mv/Av

• (1+Av Mv)Av

In the expression for voltage gain with negative voltage feedback the term 1+AmMv is known as

• gain factor

• feedback factor

• sacrifice factor

• none of the above

Feedback is an amplifier always helps to

• Control its output

• Increase its output

• Decrease its input impedance

• Stabilize its gain.