In this section of Electronic Devices and Circuits.It contain A.C Models – AC Analysis of BJT circuits and small signal amplifier MCQs (Multiple Choice Questions Answers).All the MCQs (Multiple Choice Question Answers) requires in depth reading of Electronic Devices and Circuits Subject as the hardness level of MCQs have been kept to advance level.These Sets of Questions are very helpful in Preparing for various Competitive Exams and University level Exams.

This Section Covers below lists of topics :

1. Base-Biased Amplifier MCQs
2. Emitter-Biased Amplifier MCQs
3. Small Signal Operation MCQs
4. AC Beta MCQs
5. AC Resistance of the Emitter Diode MCQs
6. Two Transistors Models MCQs
7. Analyzing an Amplifier MCQs
8. AC Quantities on the Data Sheet MCQs

Practice it now to sharpen your concept.

PRACTICE IT NOW TO SHARPEN YOUR CONCEPT AND KNOWLEDGE

• Zero
• Maximum
• Minimum
• Average

• Zero
• Maximum
• Minimum
• Average

#### 3. A coupling capacitor is

• A dc short
• An ac open
• A dc open and an ac short
• A dc short and an ac open

#### 4. In a bypass circuit, the top of a capacitor is

• An open
• A short
• An ac ground
• A mechanical ground

#### 5. The capacitor that produces an ac ground is called a

• Bypass capacitor
• Coupling capacitor
• Dc open
• Ac open

#### 6. The capacitors of a CE amplifier appear

• Open to ac
• Shorted to dc
• Open to supply voltage
• Shorted to ac

#### 7. Reducing all dc sources to zero is one of the steps in getting the

• DC equivalent circuit
• AC equivalent circuit
• Complete amplifier circuit
• Voltage-divider biased circuit

• Resistors
• Capacitors
• Inductors
• Transistors

• Sinusoidal
• Constant
• Distorted
• Alternating

#### 10. In a CE amplifier with a large input signal, the positive half cycle of the ac emitter current is

• Equal to the negative half cycle
• Smaller than the negative half cycle
• Larger than the negative half cycle
• Equal to the negative half cycle

#### 11. Ac emitter resistance equals 25 mV divided by the

• Quiescent base current
• DC emitter current
• AC emitter current
• Change in collector current

#### 12. To reduce the distortion in a CE amplifier, reduce the

• DC emitter current
• Base-emitter voltage
• Collector current
• AC base voltage

• 1 ohm
• 10 ohm
• 100 ohm
• 1 kohm

#### 14. A graph of ac emitter current versus ac base-emitter voltage applies to the

• Transistor
• Emitter diode
• Collector diode
• Power supply

#### 15. The output voltage of a CE amplifier is

• Amplified
• Inverted
• 180 degrees out of phase with the input
• All of the above

#### 16. The emitter of a CE amplifier has no ac voltage because of the

• DC voltage on it
• Bypass capacitor
• Coupling capacitor

#### 17. The voltage across the load resistor of a CE amplifier is

• Dc and ac
• DC only
• AC only
• Neither dc nor ac

#### 18. The ac collector current is approximately equal to the

• AC base current
• AC emitter current
• AC source current
• AC bypass current

#### 19. The ac emitter current times the ac emitter resistance equals the

• Dc emitter voltage
• AC base voltage
• AC collector voltage
• Supply voltage

#### 20. The ac collector current equals the ac base current times the

• AC collector resistance
• DC current gain
• AC current gain
• Generator voltage

#### 21. The emitter is at ac ground in a

• CB stage
• CC stage
• CE stage
• None of these

#### 22. The output voltage of a CE stage is usually

• Constant
• Dependent on re’
• Small
• Less the one

#### 23. The voltage gain equals the output voltage divided by the

• Input voltage
• AC emitter resistance
• AC collector resistance
• Generator voltage

#### 24. The input impedance of the base increases when

• Beta increases
• Supply voltage increases
• Beta decreases
• AC collector resistance increases

#### 25. Voltage gain is directly proportional to

• Beta
• Ac emitter resistance
• DC collector voltage
• AC collector resistance

• Small
• Equal
• Large
• Zero

• Smaller
• Equal
• Larger
• Zero

#### 28. To reduce the distortion of an amplified signal, you can increase the

• Collector resistance
• Emitter feedback resistance
• Generator resistance

#### 29. The emitter of a swamped amplifier

• Is grounded
• Has no de voltage
• Has an ac voltage
• Has no ac voltage

#### 30. A swamped amplifier uses

• Base bias
• Positive feedback
• Negative feedback
• A grounded emitter

#### 31. In a swamped amplifier, the effects of the emitter diode become

• Important to voltage gain
• Critical to input impedance
• Significant to the analysis
• Unimportant

#### 32. The feedback resistor

• Increases voltage gain
• Reduces distortion
• Decreases collector resistance
• Decreases input impedance

#### 33. The feedback resistor

• Stabilizes voltage gain
• Increases distortion
• Increases collector resistance
• Decreases input impedance

#### 34. The ac collector resistance of the first stage includes the

• Input impedance of first stage
• Emitter resistance of first stage
• Input impedance of second stage

#### 35. If the emitter bypass capacitor opens, the ac output voltage will

• Decrease
• Increase
• Remain the same
• Equal zero

#### 36. If the collector resistor is shorted, the ac output voltage will

• Decrease
• Increase
• Remain the same
• Equal zero

#### 37. If the load resistance is open, the ac output voltage will

• Decrease
• Increase
• Remain the same
• Equal zero

#### 38. If any capacitor is open, the ac output voltage will

• Decrease
• Increase
• Remain the same
• Equal zero

#### 39. If the input coupling capacitor is open, the ac input voltage will

• Decrease
• Increase
• Remain the same
• Equal zero

#### 40. If the bypass capacitor is open, the ac input voltage will

• Decrease
• Increase
• Remain the same
• Equal zero

#### 41. If the output coupling capacitor is open, the ac input voltage will

• Decrease
• Increase
• Remain the same
• Equal zero

#### 42. If the emitter resistor is open, the ac input voltage will

• Decrease
• Increase
• Remain the same
• Equal zero

#### 43. If the collector resistor is open, the ac input voltage will

• Decrease
• Increase
• Remain the same
• Equal approximately zero

#### 44. If the emitter bypass capacitor is shorted, the ac input voltage will

• Decrease
• Increase
• Remain the same
• Equal zero
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