Analog and Digital Electronics 6

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Analog and Digital Electronics 6

Part 6 List for questions and answers of Analog & Digital Electronics


Q1. A transistor may be used as a switching device or as a

a) Rectifier

b) Variable resistor

c) Fixed resistor

d) Tuning device


Q2. Most of the electrons in the base of an NPN transistor flow

a) Into the base supply

b) Into the collector

c) Out of the base lead

d) Into the emitter


Q3. Three different Q points are shown on a dc load line. The upper Q point represents the

a) Maximum current gain

b) Intermediate current gain

c) Cutoff point

d) Minimum current gain


Q4. With the positive probe on an NPN base, an ohmmeter reading between the other

transistor terminals should be

a) Low resistance

b) Infinite

c) High resistance

d) Open


Q5. When a silicon diode is forward biased, what is VBE for a C-E configuration?

a) Voltage-divider bias

b) 0.4 V

c) 0.7 V

d) Emitter voltage


Q6. If a 2 mV signal produces a 2 V output, what is the voltage gain?

a) 0.001

b) 100

c) 0.004

d) 1000 


Q7. Which is beta’s current ratio?

a) IC/IB

b) IC/IE

c) IE/IB

d) IB/IE


Q8. What is the current gain for a common-base configuration where IE = 4.2 mA and IC = 4.0 mA?

a) 1.05

b) 16.80

c) 0.20

d) 0.95


Q9. To operate properly, a transistor’s base-emitter junction must be forward biased with reverse bias applied to which junction?

a) Collector-emitter

b) Base-collector

c) Base-emitter

d) Collector-base


Q10. When transistors are used in digital circuits they usually operate in the

a) Saturation and cutoff regions

b) Linear region

c) Active region

d) Breakdown region


Q11. The C-B configuration is used to provide which type of gain?

a) Current

b) Resistance

c) Voltage

d) Power


Q12. The Q point on a load line may be used to determine

a) VCC

b) VC

c) VB

d) IC 


Q13. With low-power transistor packages, the base terminal is usually the

a) Right end

b) Tab end

c) Middle

d) Stud mount


Q14. Voltage-divider bias provides

a) A stable Q point

b) A Q point that easily varies with changes in the transistor’s current gain

c) An unstable Q point

d) A Q point that is stable and easily varies with changes in the transistor’s current gain


Q15. A current ratio of IC/IE is usually less than one and is called

a) Beta

b) Omega

c) Theta

d) Alpha


Q16. In a transistor, collector current is controlled by

a) Collector resistance

b) Base current

c) Collector voltage

d) All


Q17. In a C-E configuration, an emitter resistor is used for

a) Stabilization

b) Ac signal bypass

c) Collector bias

d) Higher gain


Q18. The ends of a load line drawn on a family of curves determine

a) The power curve

b) The amplification factor

c) The operating point

d) Saturation and cutoff


Q19. With a PNP circuit, the most positive voltage is probably

a) VBE

b) ground

c) VC

d) VCC 


Q20. Total emitter current is

a) IC + IE

b) IB + IC

c) IE- IC

d) IB – IC 


Part 6: List for questions and answers of Analog & Digital Electronics


Q1. Answer:a


Q2. Answer:b


Q3. Answer:a


Q4. Answer:a


Q5. Answer:d


Q6. Answer:d


Q7. Answer:a


Q8. Answer:d


Q9. Answer:d


Q10. Answer:a


Q11. Answer:c


Q12. Answer:c


Q13. Answer:c


Q14. Answer:a


Q15. Answer:d


Q16. Answer:b


Q17. Answer:a


Q18. Answer:d


Q19. Answer:b


Q20. Answer:b