Nothing Special   »   [go: up one dir, main page]
Scribd Logo
Upload

Welcome to Scribd!

  • 77 views

    Elex 2L Prelim Exam

    Uploaded by

    Midas Troy Victor
    1. The document contains 15 multiple choice questions about transistors and amplifiers. It asks the reader to select the best answer for each question. 2. It also contains 2 short essay questions asking the reader to explain the function of a transistor as a switch and the basic function of a cascaded amplifier. 3. The questions cover topics like the biasing of transistor junctions, how collector current responds to changes in base current and collector voltage, the use of transistors as switches and current controls, voltage gain in single and multi-stage amplifiers, and the effects of adding capacitors and loads.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    Elex 2L Prelim Exam

    Uploaded by

    Midas Troy Victor
    77 views3 pages
    1. The document contains 15 multiple choice questions about transistors and amplifiers. It asks the reader to select the best answer for each question. 2. It also contains 2 short essay questions asking the reader to explain the function of a transistor as a switch and the basic function of a cascaded amplifier. 3. The questions cover topics like the biasing of transistor junctions, how collector current responds to changes in base current and collector voltage, the use of transistors as switches and current controls, voltage gain in single and multi-stage amplifiers, and the effects of adding capacitors and loads.

    Original Description:

    Review

    Original Title

    484973491-Elex-2L-Prelim-Exam

    Copyright

    © © All Rights Reserved

    Available Formats

    PDF, TXT or read online from Scribd

    Did you find this document useful?

    Is this content inappropriate?

    1. The document contains 15 multiple choice questions about transistors and amplifiers. It asks the reader to select the best answer for each question. 2. It also contains 2 short essay questions asking the reader to explain the function of a transistor as a switch and the basic function of a cascaded amplifier. 3. The questions cover topics like the biasing of transistor junctions, how collector current responds to changes in base current and collector voltage, the use of transistors as switches and current controls, voltage gain in single and multi-stage amplifiers, and the effects of adding capacitors and loads.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    77 views3 pages

    Elex 2L Prelim Exam

    Uploaded by

    Midas Troy Victor
    1. The document contains 15 multiple choice questions about transistors and amplifiers. It asks the reader to select the best answer for each question. 2. It also contains 2 short essay questions asking the reader to explain the function of a transistor as a switch and the basic function of a cascaded amplifier. 3. The questions cover topics like the biasing of transistor junctions, how collector current responds to changes in base current and collector voltage, the use of transistors as switches and current controls, voltage gain in single and multi-stage amplifiers, and the effects of adding capacitors and loads.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    You are on page 1of 3

    Multiple Choice: Encircle the letter of the best/right answer (2 pts each)

    1. For the base current to flow in a transistor


    a. The base must be more positive than the emitter
    b. The base must be more negative than the emitter
    c. The base-emitter junction must be forward biased
    d. The base-emitter junction must be reversed biased
    2. For collector current to flow in an NPN transistor, the base and collector must be;
    a. More positive than the emitter
    b. More negative than the emitter
    c. Forward biased
    d. Reverse biased
    3. The base to emitter voltage drop of a forward biased transistor is typically;
    a. 0.5 - 0.7 volts for a silicon NPN
    b. 1.5 to 3.0 volts for a germanium NPN
    c. 1.5 - 3.0 volts for a silicon NPN
    d. 5 - 7 volts for a silicon NPN
    4. For given collector voltage, what happens to collector current as base current increases?
    a. It increases
    b. It remains constant Prelim Examination
    c. It decreases MEC 321L
    1
    d. It approaches cut-off
    Name: ________________________________________________________________ Score:_________________
    5. For a given base current what happens to collector current as collector voltage increases?
    a. It does not change
    b. It increases rapidly
    c. it increases slightly
    d. It decreases slightly
    6. Can collector current be cut-off (reduced to nearly zero) by reducing base current?
    a. Sometimes
    b. Never
    c. It has almost no effect
    d. Yes
    7. PNP transistors:
    a. Must have 3 terminal connections
    b. Must have two PN junctions
    c. Neither (a) nor (b)
    d. Both (a) and (b)
    8. For any transistor to operate normally:
    a. Both base-emitter and collector-base junctions must be forward biased
    b. Both base-emitter and collector-base junction must be reverse biased
    c. The base-emitter junction must be forward biased while the collector-base junction is reversed biased

    1 | P r e l i m E x a m i n a ti o n
    9. Which of the following is a true statement?
    a. An NPN transistor can control power to a load in its collector circuit
    b. A PNP transistor can be used as a switching device
    c. An NPN transistor can be used to control current from zero to some predetermined level
    d. All of the above
    10. A transistor can be used as a solid-state variable current control?
    a. Sometimes
    b. Yes
    c. No
    d. It has no function
    11. The voltage gain of a two-stage cascaded voltage amplifier is:
    a. Equal to the gain of the first stage plus the gain of the second stage.
    b. Equal to the gain of the first stage times the gain of the second stage.
    c. Equal to the input voltage divided by the output voltage.
    d. Equal to the output divided by the input voltage of the second stage.
    12. Adding an external load to the output of a two-stage RC coupled amplifier:
    a. Increases the output signal
    b. Increases the output impedance
    c. Decreases the load of the first stage
    Prelim Examination
    d. Decrease the voltage gain
    MEC 321L
    2 13. Adding an emitter bypass capacitor:
    a. Increases the frequency response
    Name: ________________________________________________________________ Score:_________________
    b. Increases the voltage gain
    c. Increases the emitter current
    d. All of the above
    14. An electrolytic capacitor used for coupling between stages:
    a. Must be connected with proper polarity
    b. Must have low reactance at the operating frequencies
    c. Must have low dc leakage current
    d. All of the above
    15. The frequency response of a typical RC coupled amplifier
    a. Is relatively flat over a range of audio frequency
    b. Has a peaked response over a range of audio frequencies
    c. Is relatively poor at the upper audio frequencies
    d. Is relatively poor at the lower audio frequencies

    2 | P r e l i m E x a m i n a ti o n
    II. Essay:

    1. Explain the function of a transistor as a switch (on-off) in a circuit 10 pts

    2. Explain the basic function of cascaded amplifier and why is it being used? 10 pts

    Prelim Examination
    MEC 321L
    3
    Name: ________________________________________________________________ Score:_________________

    3 | P r e l i m E x a m i n a ti o n

    You might also like