Transistors Objective Questions:






Q(1). At the base-emitter junctions of a transistor, one finds ……………

1. a reverse bias
2. a wide depletion layer
3. low resistance
4. none of the above

Ans : 3


Q(2). The input impedance of a transistor is ………….

1.  high
2.  low
3. very high
4.  almost zero

Ans : 2


 Q(3). Most of the majority carriers from the emitter ………………..

1.  recombine in the base
2. recombine in the emitter
3.  pass through the base region to the collector
4.  none of the above

Ans :3


 Q(4). The current IB is …………

1.   electron current
2.   hole current
3.    donor ion current
4.    acceptor ion current

Ans : 1


Q(5). In a transistor ………………..

 1.   IC = IE + IB
2.    IB =C + IE
3.    IE = IC – IB
 4.   IE = IC + IB

Ans : 4


 Q(6). The value of α of a transistor is ……….

1.  more than 1
2.   less than 1
3.   1
4.  none of the above

Ans : 2


Q(7). IC = αIE + ………….

1.  IB
2.  ICEO
3. ICBO
4.  βIB

Ans : 3


Q(8). The output impedance of a transistor is ……………..

1. high
2.  zero
3.  low
4.  very low

Ans : 1


 Q(9). In a transistor, IC = 100 mA and IE = 100.2 mA. The value of β is …………

1.  100
2.  50
3.  about 1
4.  200

Ans : 4


Q(10). In a transistor if β = 100 and collector current is 10 mA, then IE is …………

1.  100 mA
2.  100.1 mA
3.  110 mA
4.  none of the above

Ans : 2


 Q(11). In a pnp transistor, the current carriers are ………….

1.  acceptor ions
2.   donor ions
3.  free electrons
4.   holes

Ans : 4


Q(12). The collector of a transistor is …………. doped

1.  heavily
2.   moderately
3. lightly
4.  none of the above

Ans : 2


Q(13). A transistor is a …………… operated device

1. current
2.  voltage
3.  both voltage and current
4. none of the above

Ans : 1


Q(14). In a npn transistor, ……………. are the minority carriers

1.  free electrons
2.  holes
3.   donor ions
4.  acceptor ions

Ans : 2


Q(15). The emitter of a transistor is ………………… doped

1.  lightly
2.  heavily
3.  moderately
4.  none of the above

Ans : 2


Q(16). In a transistor, the base current is about ………….. of emitter current

1.   25%
2.  20%
3.  35 %
4.   5%

Ans : 4


Q(17). A transistor has …………………

1.  one pn junction
2.  two pn junctions
3.  three pn junctions
4.  four pn junctions

Ans : 2


Q(18). The number of depletion layers in a transistor is …………

1.  four
2.   three
3.  one
4.   two

Ans : 4


Q(19). The base of a transistor is ………….. doped

1.  heavily
2.  moderately
3.  lightly
4. none of the above

Ans : 3


Q(20). The element that has the biggest size in a transistor is ………………..

1.  collector
2.  base
3.  emitter
4.  collector-base-junction

Ans : 1