11. Which of the following statement is correct
a. FET and junction transistor both are unipolar
b. FET and junction transistor both are bipolar
c. The FET is bipolar , while junction transistor are unipolar
d. The FET is unipolar , while junction transistor are bipolar
12. Most small signal transistors are
a. NPN , silicon in a plastic package
b. PNP , silicon in a plastic package
c. NPN , germanium in a metallic case
d. PNP , germanium in a mettalic case
13. A transistor may fail due to
a. open weld at the wire leads to the semi conductor
b. short circuit caused by momentary over loads
c. overheating due to circuit failures
d. any of the above
14. The transistor is usually encapsuled in
a. graphite powder
b. enamel paint
c. epoxy resin
d. any of the above
15. Arrow head on a transistor symbol indicates
a. Direction of electron current in emitter
b. Direction of hole current in emitter
c. Diffusion current in emitter
d. Drift current in emitter
16. Power transistors are invariably provided with
a. soldered connections
b. heat sink
c. metallic casing
d. none of the above
17. The heat sink disposes off heat mainly by
a. radiation
b. natural convection
c. forced convection
d. conduction
18. Largest current flows of a bipolar transistor occurs
a. In emitter
b. In base
c. in collector
d. Through emitter-collector
19. Conventional biasing of a bipolar transistor has
a. EB forward biased and CB forward biased
b. EB reversed biased and CB forward biased
c. EB forward biased and CB reverse biased
d. EB reversed biased and CB reverse biased
20. Which of the following number specification refers to FET with one gate
a. 2 N
b. 3 N
c. 3 Y
d. 3 X
