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Bipolar Junction Transistor Amplifiers MCQ Boylestad Test Prep, Exams of Electrical and Electronics Engineering

University of California - BerkeleyElectrical and Electronics Engineering

Bipolar Junction Transistor Amplifiers Bipolar Junction Transistor Amplifiers MCQ Boylestad Test Prep

Typology: Exams

2024/2025

Available from 06/18/2025

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Bipolar Junction Transistor Amplifiers MCQ Boylestad Test Prep
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1. Which of the following techniques can be used in the sinusoidal ac analysis
of transistor networks?
A) Small-signal
B) Large-signal
C) Small- or large-signal
D) None of the above: C
2. What is the limit of the efficiency defined by = Po/Pi?
A) Greater than 1
B) Less than 1
C) Always 1
D) None of the above: B
3. Which of the following define(s) the conversion efficiency?
A) Ac power to the load/ac input power
B) Ac power to the load/dc power supplied
C) Dc output power/ac input power
D) All of the above: B
4. Which of the following should be done to obtain the ac equivalent of a
network?
A) Set all dc sources to zero
B) Replace all capacitors by a short-circuit equivalent.
C) Remove all elements bypassed by the short-circuit equivalent.
D) All of the above: D
5. The model suffers from being limited to a particular set of operating
conditions if it is to be considered accurate.
A) hybrid equivalent
B) re
C) ²
D) Thevenin: A
6. The model fails to account for the output impedance level of the
device and the feedback effect from output to input.
A) hybrid equivalent
B) re
C) ²
D) Thevenin: B
7. Which of the following is (are) true regarding the input impedance for
frequencies in the midrange d100 kHz of a BJT transistor amplifier?
A) The input impedance is purely resistive.
B) It varies from a few ohms to mega ohms.
C) An ohmmeter cannot be used to measure the small-signal ac input imped-
pf3
pf4
pf5
pf8
pf9
pfa

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  1. Which of the following techniques can be used in the sinusoidal ac analysis of transistor networks? A) Small-signal B) Large-signal C) Small- or large-signal D) None of the above: C
  2. What is the limit of the efficiency defined by = Po/Pi? A) Greater than 1 B) Less than 1 C) Always 1 D) None of the above: B
  3. Which of the following define(s) the conversion efficiency? A) Ac power to the load/ac input power B) Ac power to the load/dc power supplied C) Dc output power/ac input power D) All of the above: B
  4. Which of the following should be done to obtain the ac equivalent of a network? A) Set all dc sources to zero B) Replace all capacitors by a short-circuit equivalent. C) Remove all elements bypassed by the short-circuit equivalent. D) All of the above: D
  5. The model suffers from being limited to a particular set of operating conditions if it is to be considered accurate. A) hybrid equivalent B) re C) ² D) Thevenin: A
  6. The model fails to account for the output impedance level of the device and the feedback effect from output to input. A) hybrid equivalent B) re C) ² D) Thevenin: B
  7. Which of the following is (are) true regarding the input impedance for frequencies in the midrange d100 kHz of a BJT transistor amplifier? A) The input impedance is purely resistive. B) It varies from a few ohms to mega ohms. C) An ohmmeter cannot be used to measure the small-signal ac input imped-

ance. D) All of the above: D

  1. Which of the following is (are) true regarding the output impedance for frequencies in the midrange d100 kHz of a BJT transistor amplifier? A) The output impedance is purely resistive. B) It varies from a few ohms to more than 2 M.& C) An ohmmeter cannot be used to measure the small-signal ac output imped- ance. D) All of the above: D
  2. What is the range of the current gain for BJT transistor amplifiers? A) less than 1 B) 1 to 100 C) above 100 D) All of the above: D
  3. The input impedance of a BJT amplifier is purely in nature and can vary from a few to. A) resistive, ohms, megohms B) capacitive, microfarads, farads C) inductive, millihenrys, henrys D) None of the above: A
  4. For BJT amplifiers, the gain typically ranges from a level just less than 1 to a level that may exceed 1000. A) voltage B) current C) impedance D) All of the above: B
  5. What is the unit of the parameter ho? A) Volt B) Ohm C) Siemen D) No unit: C
  6. Which of the h-parameters corresponds to re in a common-base configu- ration? A) hib B) hfb C) hrb D) hob: A
  7. What is the range of the input impedance of a common-base configura- tion?
  1. For the common-emitter fixed-bias configuration, there is a phase shift between the input and output signals. A) 0° B) 45° C) 90° D) 180°: D
  2. Which of the following configurations has an output impedance Zo equal to RC? A) Fixed-bias common-emitter B) Common-emitter voltage-divider with bypass capacitor C) Common-emitter voltage-divider without bypass capacitor D) All of the above: D
  3. Which of the following configurations has a voltage gain of -RC /re? A) Fixed-bias common-emitter B) Common-emitter voltage-divider with bypass capacitor C) Fixed-bias common-emitter and voltage-divider with bypass capacitor D) Common-emitter voltage-divider without bypass capacitor: C
  4. Which of the following configurations has the lowest output impedance? A) Fixed-bias B) Voltage-divider C) Emitter-follower D) None of the above: C
  5. The configuration is frequently used for impedance matching. A) fixed-bias B) voltage-divider bias C) emitter-follower D) collector feedback: C
  6. The emitter-follower configuration has a impedance at the input and a impedance at the output. A) low, low B) low, high C) high, low D) high, high: C
  7. Which of the following gains is less than 1 for a common-base configura- tion? A) Ai B) Av C) Ap D) None of the above: A
  1. Which of the following conditions must be met to allow the use of the approximate approach in a voltage-divider bias configuration? A) ²re > 10R B) ²RE > 10R C) ²RE < 10R D) ²re < 10R2: A
  2. Which one of the following configurations has the lowest input imped- ance? A) Fixed-bias B) Common-base C) Emitter-follower D) Voltage-divider?: B
  3. For the collector dc feedback configuration, there is a phase shift between the input and output signals. A) 0° B) 45° C) 90° D) 180°: D
  4. Which of the following represent(s) the advantage(s) of the system ap- proach over the r-model approach? A) Thevenin's theorem can be used. B) The effect of changing the load can be determined by a simple equation. C) There is no need to go back to the ac equivalent model and analyze the entire network. D) All of the above: D
  5. The loaded voltage gain of an amplifier is always more than the no-load level. A) True B) False: B
  6. The smaller the level of RL, the larger the level of ac voltage gain. A) True B) False: B
  7. Which of the following is (are) true to achieve a good overall voltage gain for the circuit? A) The effect of Rs and RL must be considered as a product. B) The effect of Rs and RL must be considered as a product and evaluated individually. C) The effect of Rs and RL must be evaluated individually. D) None of the above: B
  1. The peak value of the ac input signal is controlled by the in a transistor network for the frequencies in the low to midrange. A) resistors B) applied dc voltage C) capacitors D) None of the above: B
  2. can be applied to determine the response of the ac equivalent circuit. A) Mesh analysis B) Node analysis C) Thevenin's theorem D) All of the above: D
  3. For transistor amplifiers, the no-load voltage gain is the loaded voltage gain. A) smaller than B) greater than C) the same as D) None of the above: B
  4. The input and output signals are for the typical transistor amplifier at frequencies that permit ignoring the effects of the reactive elements. A) in phase B) 180° out of phase C) either in phase or 180° out of phase D) None of the above: C
  5. One junction of an operating transistor is and the other one is . A) forward-biased, forward-biased B) forward-biased, reverse-biased C) reverse-biased, reverse-biased D) None of the above: B
  6. For a common-base configuration, the input impedance is relatively and the output impedance quite. A) high, small B) small, high C) small, small D) high, high: B
  7. The output voltage and the input voltage are for the common-base configuration. A) 45° out of phase

B) 90° out of phase C) 180° out of phase D) in phase: D

  1. In a common-emitter configuration is the controlling current while is the controlled current. A) IC, IB B) IC, IE C) IB, IC D) None of the above: C
  2. The level of re is determined by. A) ± B) IE C) ² D) IB: B
  3. The output voltage and the input voltage are for the common-emit- ter configuration. A) in phase B) 45° out of phase C) 90° out of phase D) 180° out of phase: D
  4. The common-emitter configuration has a level of input impedance with a voltage and current gain. A) moderate, high B) low, moderate C) low, low D) high, low: A
  5. refers to the forward transfer current ratio. A) hi B) hr C) hf D) ho: C
  6. For the common-emitter and common-base configurations, the magnitude of and is often not included in the model. A) hr, ho B) hi, he C) hi, hr D) he, ho: A
  7. In a fixed-bias network, the input signal Vi is applied to the of the transistor while the output Vo is off the.
  1. is slightly affected if the condition ro e10RE is not satisfied in the analysis of an emitter-follower configuration. A) Zi B) Zo C) Av D) Ai: C
  2. A common-base configuration has impedance at the input and impedance at the output. A) high, high B) high, low C) low, low D) low, high: D
  3. In a common-base configuration, the input and output voltages are and the output and input currents are. A) 180° out of phase, 180° out of phase B) 180° out of phase, in phase C) in phase,180° out of phase D) in phase, in phase: D
  4. Ideally, the changes in the load resistor or the source resistor should have effect on all the parameters of the two-port model. A) a great B) a moderate C) no D) None of the above: C
  5. The loaded voltage gain of an amplifier is the no-load level. A) always more than B) always less than C) always the same as D) None of the above: B
  6. The coupling capacitor places the load and collector resistors in a arrangement. A) series B) parallel C) series-parallel D) None of the above: B
  7. The dc load line and ac load line both have the same. A) x-intercept B) y-intercept

C) slope D) Q-point: D

  1. The the level of RL, the the level of ac voltage gain. A) smaller, higher B) larger, lower C) smaller, lower D) None of the above: C
  2. The the source resistance, the the overall gain of an amplifier. A) larger, higher B) larger, lower C) lower, lower D) None of the above: B
  3. The ac voltage gain of a Darlington connection is about. A) 0 B) 1 C) ²D D) None of the above: B
  4. The feedback pair uses a(n) transistor driving a(n) tran- sistor, the two devices acting effectively much like one pnp transistor. A) pnp, npn B) pnp, pnp C) npn, npn D) None of the above: A
  5. In an unbypassed emitter-bias configuration replaces re in the hybrid equivalent circuit. A) hie B) hfe C) hre D) hoe: A
  6. In a hybrid equivalent circuit, is determined to make it easier to find the other parameters. A) Zi B) Zo C) Ai D) Av: D