Floyd Self-test Chapter 6 Topic Outline
- Floyd Self-test in Bipolar Junction Transistors Amplifiers
- Floyd Self-test in Amplifier Operation
- Floyd Self-test in Transistor AC Models
- Floyd Self-test in The Common-Emitter Amplifier
- Floyd Self-test in The Common-Collector Amplifier
- Floyd Self-test in The Common-Base Amplifier
- Floyd Self-test in Multistage Amplifiers
- Floyd Self-test in The Differential Amplifier
Start Practice Exam Test Questions
Choose the letter of the best answer in each questions.
1. A small-signal amplifier
- (a) uses only a small portion of its load line
- (b) always has an output signal in the mV range
- (c) goes into saturation once on each input cycle
- (d) is always a common-emitter amplifier
2. The parameter hfe corresponds to
- (a) βdc
- (b) βac
- (c) r’e
- (d) r’c
3. If the dc emitter current in a certain transistor amplifier is 3 mA, the approximate value of is
- (a) 3kΩ
- (b) 3Ω
- (c) 8.33Ω
- (d) 0.33Ω
4. A certain common-emitter amplifier has a voltage gain of 100. If the emitter bypass capacitor is removed,
- (a) the circuit will become unstable
- (b) the voltage gain will decrease
- (c) the voltage gain will increase
- (d) the Q-point will shift
5. For a common-emitter amplifier, RC = 1.0 kΩ, RE = 390Ω, r ’e = 15 Ω, and = 75.
Assuming that RE is completely bypassed at the operating frequency, the voltage gain is
- (a) 66.7
- (b) 2.56
- (c) 2.47
- (d) 75
6. In the circuit of Question 5, if the frequency is reduced to the point where XC (bypass)= RE, the voltage gain
- (a)remains the same
- (b) is less
- (c) is greater
7. In a common-emitter amplifier with voltage-divider bias, RIN(BASE)=68kΩ, R1= 33kΩ, and R2= 15kΩ. The total ac input resistance is
- (a) 68kΩ
- (b) 8.95kΩ
- (c) 22.2kΩ
- (d) 12.3kΩ
8. A CE amplifier is driving a load. If the voltage gain is approximately
- (a) 220
- (b) 1000
- (c) 10
- (d) 180
9. For a common-collector amplifier, RE= 100Ω, r’e =10Ω, and = 150. The ac input
resistance at the base is
- (a) 1500 Ω
- (b) 15k Ω
- (c) 110 Ω
- (d) 16.5k Ω
10. If a 10 mV signal is applied to the base of the emitter-follower circuit in Question 9, the output signal is approximately
- (a) 100 mV
- (b) 150 mV
- (c) 1.5 V
- (d) 10 mV
11. In a certain emitter-follower circuit, the current gain is 50. The power gain is approximately
- (a) 50AV
- (b) 50
- (c) 1
- (d) answers (a) and (b)
12. In a Darlington pair configuration, each transistor has an ac beta of 125. If RE is the
input resistance is
- (a) 560Ω
- (b) 70kΩ
- (c) 8.75M Ω
- (d) 140kΩ
13. The input resistance of a common-base amplifier is
- (a) very low
- (b) very high
- (c) the same as a CE
- (d) the same as a CC
14. Each stage of a four-stage amplifier has a voltage gain of 15. The overall voltage gain is
- (a) 60
- (b) 15
- (c) 50,625
- (d) 3078
15. The overall gain found in Question 14 can be expressed in decibels as
- (a) 94.1 dB
- (b) 47.0 dB
- (c) 35.6 dB
- (d) 69.8 dB
16. A differential amplifier
- (a) is used in op-amps
- (b) has one input and one output
- (c) has two outputs
- (d) answers (a) and (c)
17. When a differential amplifier is operated single-ended,
- (a) the output is grounded
- (b) one input is grounded and a signal is applied to the other
- (c) both inputs are connected together
- (d) the output is not inverted
18. In the double-ended differential mode,
- (a) opposite polarity signals are applied to the inputs
- (b) the gain is 1
- (c) the outputs are different amplitudes
- (d) only one supply voltage is used
19. In the common mode,
- (a) both inputs are grounded
- (b) the outputs are connected together
- (c) an identical signal appears on both inputs
- (d) the output signals are in-phase
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