Analog Electronics
The base of an npn transistor is thin and

 doped by a pentavalent material.
  lightly doped.
 metallic.
 heavily doped.

ANSWER DOWNLOAD EXAMIANS APP

Analog Electronics
Optocouplers combine

 Power transistor and silicon transistor.
 SITs and BJTs.
  Infrared light emitting diode and a silicon photo transistor.
 IGBTs and MOSFETs.

ANSWER DOWNLOAD EXAMIANS APP

Analog Electronics
In an OP-amp differentiator

The amplitude of output is proportional to input
The amplitude of output is proportional to rate of change of input
Polarity of input and output is the same
Output occurs when input is finite and constant

ANSWER DOWNLOAD EXAMIANS APP