A transistor has _______

•     one pn junction

•      Two pn junctions

•      three pn junctions

• four pn junctions

The number of depletion layers in a transistor is …………

•    four

•      three

•     one

•    two

The base of a transistor is ………….. doped

• heavily

•   moderately

•  lightly

• none of the above

The element that has the biggest size in a transistor is ………………..

•  collector

• base

•  emitter

•   collector-base-junction

The transistor was invented in 

• 1948

• 1947

• 1974

• 1847

In a NPN transistor, the N-regions are_____________

• Base and Emitter

• Base and collector

• Emitter and collector

• Both A and B

In a PNP transistor, the P regions are____________

• Base and Emitter

• Base and collector

• Emitter and collector

• Both A and B

The emitter current is approximately equal to ____________________

•  base
  current

• collector current

• Sum of base current and collector current

• None 

In NPN Transistor current conduction is mainly due to the flow of

• Electrons

• Holes

• protons

• None of the above

In PNP Transistor current conduction is mainly due to the flow of

• Electrons

• Holes

• neutrons

• None of the above