Analog Electronics
A JFET has disadvantage of

  possessing positive temperature coefficient.
  having small gain-bandwidth product.
  being noisy.
  having low input impedance.

ANSWER DOWNLOAD EXAMIANS APP

Analog Electronics
Voltage Series (feedback also called series-shunt feedback) results in

Decrease in input impedance & increase in output impedance
Increase in both input & output impedances
Increase in input impedance & decreases in output impedance
Decreases in both input & output impedances

ANSWER DOWNLOAD EXAMIANS APP