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You Are On Multi Choice Question Bank SET 1009

50451. The ________ model fails to account for the output impedance level of the device and the feedback effect from output to input.




50452. Refer to this figure. Calculate the value of VB.





50453. You have a need to apply an amplifier with a very high power gain. Which of the following would you choose?





50454. What is the voltage gain of a feedback pair connection?





50455. A common-emitter amplifier has ________ voltage gain, ________ current gain, ________ power gain, and ________ input impedance.





50456. What is the range of the input impedance of a common-base configuration?





50457. The advantage that a Sziklai pair has over a Darlington pair is





50458. What is the typical range of the output impedance of a common-emitter configuration?





50459. What is the unit of the parameter ho?





50460. Refer to this figure. Calculate the value of Rin(tot).





50461. What is the range of the current gain for BJT transistor amplifiers?





50462. What does the negative sign in the voltage gain of the common-emitter fixed-bias configuration indicate?





50463. For the common-emitter fixed-bias configuration, there is a ________ phase shift between the input and output signals.





50464. Which one of the following configurations has the lowest input impedance?





50465. Which of the following represent(s) the advantage(s) of the system approach over the r-model approach?




50466. The differential amplifier has





50467. The emitter-follower configuration has a ________ impedance at the input and a ________ impedance at the output.





50468. The differential amplifier produces outputs that are





50469. The ________ model suffers from being limited to a particular set of operating conditions if it is to be considered accurate.




50470. Under which of the following condition(s) is the current gain ?





50471. The ________ configuration is frequently used for impedance matching.





50472. Refer to this figure. You notice while servicing this amplifier that the output signal at Vout is reduced from normal. The problem could be caused by





50473. When the bypass capacitor is removed from a common-emitter amplifier, the voltage gain




50474. Refer to this figure. Determine the value of VC.





50475. In a common-base amplifier, the input signal is connected to the





50476. Which of the following is (are) true to achieve a good overall voltage gain for the circuit?





50477. To analyze the common-emitter amplifier, what must be done to determine the dc equivalent circuit?





50478. For the common-emitter amplifier ac equivalent circuit, all capacitors are





50479. Refer to this figure. If an emitter bypass capacitor was installed, determine the value of Rin(base).





50480. Under which of the following conditions is the output impedance of the network approximately equal to RC for a common-emitter fixed-bias configuration?





50481. Which of the following gains is less than 1 for a common-base configuration?





50482. Which of the following define(s) the conversion efficiency?





50483. The dc emitter current of a transistor is 8 mA. What is the value of re?





50484. Which of the following should be done to obtain the ac equivalent of a network?





50485. In an unbypassed emitter bias configuration hie replaces ________ in the re model.



50486. Which of the following is (are) true regarding the input impedance for frequencies in the midrange 100 kHz of a BJT transistor amplifier?





50487. For the collector dc feedback configuration, there is a ________ phase shift between the input and output signals.





50488. A common-collector amplifier has ________ input resistance, ________ current gain, and ________ voltage gain.




50489. The total gain of a multistage amplifier is the ________.



50490. Which of the following configurations has an output impedance Zo equal to RC?





50491. Refer to this figure. Find the value of Rin(base).





50492. For a common-emitter amplifier, the purpose of the emitter bypass capacitor is





50493. For BJT amplifiers, the ________ gain typically ranges from a level just less than 1 to a level that may exceed 1000.





50494. The loaded voltage gain of an amplifier is always more than the no-load level.



50495. Which of the following configurations has a voltage gain of –RC /re?





50496. An emitter-follower amplifier has an input impedance of 107 k. The input signal is 12 mV. The approximate output voltage is (common-collector)





50497. Which of the following is (are) true regarding the output impedance for frequencies in the midrange 100 kHz of a BJT transistor amplifier?





50498. Refer to this figure. The output signal from the first stage of this amplifier is 0 V. The trouble could be caused by





50499. What is the limit of the efficiency defined by = Po / Pi?





50500. What is re equal to in terms of h parameters?






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