1. . The three terminals of a bipolar junction transistor are called
(A) input, output, ground
(B) p, n, p
(C) base, emitter, collector
(D) n, p, n
2. . In a PNP transistor, the p-regions are
(A) base and emitter
(B) base and collector
(C) emitter and collector
(D) none of the above
3. . For operation as an amplifier, the base of a NPN transistor must be
(A) 0 V
(B) negative with respect to the emitter
(C) positive with respect to the collector
(D) positive with respect to the emitter
4. . The emitter current is always
(A) greater than the base current
(B) less than the collector current
(C) greater than the collector current
(D) both answer a and c
5. . The βDC of a transistor is its
(A) internal resistance
(B) power gain
(C) voltage gain
(D) current gain
6. . If IC is 50 times larger than IB, then βDC is
(A) 500
(B) 0.02
(C) 100
(D) 50
7. . The approximate voltage across the forward-biased base-emitter junction of a silicon BJT is
(A) 0.3 V
(B) 0.7 V
(C) 0 V
(D) VBB
8. . The bias condition for a transistor to be used as linear amplifier is called
(A) reverse-reverse
(B) forward-reverse
(C) collector bias
(D) forward-forward
9. . If the output of a transistor amplifier is 5 V rms and the input is 100 mV rms, the voltage gain is
(A) 50
(B) 500
(C) 5
(D) 100
10. . When operated in cutoff and saturation, the transistor acts like
(A) a switch
(B) a linear amplifier
(C) a variable capacitor
(D) a variable resistor
11. . In cutoff, VCE is
(A) minimum
(B) maximum
(C) equal to VCC
(D) Both b and c
12. . In saturation, VCE is
(A) 0.7 V
(B) equal to VCC
(C) maximum
(D) minimum
13. . Once in saturation, a further increase in base current will
(A) not affect the collector current
(B) cause the collector current to decrease
(C) cause the collector current to increase
(D) turn the transistor off
14. . If the base-emitter junction is open, the collector voltage is
(A) floating
(B) VCC
(C) 0 V
(D) 0.2 V
15. . The maximum value of collector current in a biased transistor is
(A) βDCIB
(B) IC(sat)
(C) greater than IE
(D) IE - IB
16. . Ideally, a DC load line is a straight line drawn on the collector characteristics curves between
(A) the Q-point and saturation
(B) VCE(cutoff) and IC(sat)
(C) the Q-point and cutoff
(D) IB = 0 and IB = IC/βDC
17. . The input resistance at the base of a biased transistor depends mainly on
(A) βDC
(B) βDC and RE
(C) RB
(D) RE
18. . In voltage divider biased transistor circuit, Rin(base) can generally be neglected in calculation when
(A) Rin(base) > 10R2
(B) R1 ≪ R2
(C) Rin(base) > R2
(D) R2 > 10R
19. . In a certain voltage divider biased NPN transistor, VB is 2.95 V. The DC emitter voltage is approximately
(A) 2.95 V
(B) 2.25 V
(C) 0.7 V
(D) 3.65 V
20. . Voltage divider bias
(A) is not widely used
(B) is essentially independent of βDC
(C) is dependent on βDC
(D) produces positive feedback
21. . The disadvantage of fixed/base bias is that
(A) it produces low gain
(B) it is very complex
(C) it is independent of beta
(D) it produces high leakage current
22. . Emitter bias is
(A) very dependent on βDC
(B) essentially independent of βDC
(C) provides a stable bias point
(D) answer B and C
23. . In an emitter bias circuit, RE = 2.7 kΩ and VEE = 15 V. The emitter current is
(A) 180 mA
(B) 2.7 mA
(C) 5.3 mA
(D) cannot be determined
24. . Collector feedback bias is based on the principle of
(A) beta multiplication
(B) negative feedback
(C) positive feedback
(D) not very stable
25. . The parameter hfe corresponds to
(A) βAC
(B) βDC
(C) RAC
(D) RDC
26. . A certain common emitter amplifier has a voltage gain of 100. If the emitter bypass capacitor is removed
(A) the voltage gain will increase
(B) the voltage gain will decrease
(C) the circuit will become unstable
(D) the Q-point will shift
27. . In a certain emitter follower circuit, the current gain is 50. The power gain is approximately
(A) 50 AV
(B) 50
(C) 1
(D) Answer a and b
28. . The input resistance of a common base amplifier is
(A) the same as CC
(B) the same as CE
(C) very low
(D) very high
29. . A certain common source amplifier has a voltage gain of 10. If the source bypass capacitor is removed
(A) the voltage gain will increase
(B) the transconductance will increase
(C) the voltage gain will decrease
(D) the Q-point will shift
30. . The common gate amplifier differs from both the CS and CD configuration in that it has a
(A) much higher voltage gain
(B) much lower voltage gain
(C) much higher input resistance
(D) much lower input resistance
31. . If you are looking for both good voltage gain and high input resistance, you must use a
(A) CD amplifier
(B) CG amplifier
(C) CS amplifier
(D) CB amplifier