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 (a)   Network

The gain of an amplifier with feed back is known as (a)   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

(a)  

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.