Transistors Objectives Part 01

01 . The advantage of transistor over vacuum tube is A. No heat is required B. Small size and light in weight C. Very low power consumption D. all of the above.


02 . Aging effect exists in vacuum tubes only


03 . A collector collects holes from the base in case of PNP transistor


04 . In a PNP transistor, with normal bias the collector-base junction is reverse biased and the emitter base junction is forward bias


05 . A PNP transistor is made of Either silicon or germanium

06 . In most transistors, the collector region made physically larger than for dissipating heat.


07 . In a transistor which of the following region is very lightly doped and is very thin ? Base


09 . In a PNP with normal bias, the emitter junction offers a-low resistance

10 . In an NPN transistor, when emitter junction is forward biased and collector junction is reverse biased, the transistor will operate in active region.


11 . A transistor will operate in inverted region when emitter junction is reverse biased and collector junction is forward biased.


12 . In a PNP transistor, electrons flow into the transistor at the base and the collector leads

13 . Which of the following statement is correct? The FET is unipolar, while junction transistor are bipolar.


14 . Most small signal transistors are NPN, silicon, in a plastic package.


15 . A transistor may fail due toA . Open weld at the wire leads to the semiconductor B. Short circuit caused by momentary overloads C. Overheating due to circuit failures D. any of above.


16 . The transistor is usually encapsuled in epoxy resin.


17. Arrow head on a transistor symbol indicates direction of hole current in emitter.


18 . Power transistor are invariably provided with heat sink.


19 . Heat sink disposes off heat mainly by natural convection.

20 . Largest current flow of a bipolar transistor occurs in emitter.