Electrical Studys

1] In a pnp transistor, the current carriers are ………….

1 pointA. acceptor ions B. donor ionsC. free electronsD. holes

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

1 pointA. collector B. baseC. emitterD. collector-base-junction

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

1 pointA. heavily B. moderatelyC. lightlyD. none of the above

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

1 pointA. four B. threeC. oneD. two

5] A transistor has ………

1 pointA. one pn junction B. two pn junctionsC. three pn junctionsD. four pn junctions

6] A transistor is a …………… operated device

1 pointA. current B. voltageC. both voltage and currentD. none of the above

7] The emitter of a transistor is ………… doped

1 pointA. lightly B. heavilyC. moderatelyD. none of the above

8] In a npn transistor, ………. are the minority carriers

1 pointA. free electrons B. holesC. donor ionsD. acceptor ions

9] The collector of a transistor is …………. doped

1 pointA. heavily B. moderatelyC. lightlyD. none of the above

10] At the base-emitter junctions of a transistor, one finds ………

1 pointA. a reverse bias B. a wide depletion layer C. low resistanceD. none of the above

11] In a transistor, the base current is about …….. of emitter current

1 pointA. 25% B. 20%C. 35 %D. 5%

12] The current IB is ……

1 pointA. electron current B. hole currentC. donor ion currentD. acceptor ion current

13] The input impedance of a transistor is ………

1 pointA. high B. lowC. very highD. almost zero

14] Most of the majority carriers from the emitter ………

1 pointA. recombine in the base B. recombine in the emitterC. pass through the base region to the collector D. none of the above

15] In a transistor ………

1 pointA. IC = IE + IBB. IB = IC + IEC. IE = IC – IBD. IE = IC + IB

16] The value of α of a transistor is ……

1 pointA. more than 1 B. less than 1 C. 1D. none of the above

17] IC = αIE + ……

1 pointA. IB B. ICEOC. ICBOD. βIB

18] The output impedance of a transistor is ……

1 pointA. high B. zeroC. lowD. very low

19] The relation between β and α is …………

1 pointA. β = 1 / (1 – α )B. β = (1 – α ) / αC. β = α / (1 – α )D. β = α / (1 + α )

20] The value of β for a transistor is generally ……

1 pointA. 1B. less than 1 C. between 20 and 500D. above 500

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