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CSE :: Electronic Principles

Electronic Principles - Section 1
Electronic Principles - Section 2
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Electronic Principles - Section 4
Electronic Principles - Section 5

  1. Which one of the following principles best describes the basic operation of an electromagnet?

    2. A.
    Current is induced in a conductor that is moving through a magnetic field
    B.
    Like magnetic poles repel, while unlike poles attract
    C.
    Current flowing through a conductor generates a magnetic field
    D.
    Like magnetic poles attract, while unlike poles repel
    E.
    None of the above

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  2. The transistor has a collector current of 2 mA. If the current gain is 135, what is the base current?

    3. A.
    14.8 µA
    B.
    10.3 µA
    C.
    7.8 µA
    D.
    7.75 µA
    E.
    None of the above

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  3. Current and voltage are said to be in phase when:

    4. A.
    their waveforms are both ac or both dc
    B.
    they have the same amplitude and frequency
    C.
    their waveforms cross through zero and reach positive and negative peaks at the same time
    D.
    All of the above
    E.
    None of the above

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  4. Silicon atoms combine into an orderly pattern called a

    5. A.
    Crystal
    B.
    Covalent bond
    C.
    Semiconductor
    D.
    Valence orbit
    E.
    None of the above

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  5. The rotating coil of wire in an electric motor is called the:

    6. A.
    armature
    B.
    brush
    C.
    commutator
    D.
    loop
    E.
    None of the above

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  6. The north pole of a magnet is the one:

    7. A.
    that has its molecules arranged in a random pattern
    B.
    that would be attracted to the earth's north magnetic pole
    C.
    that would be repelled by the south pole of another magnet
    D.
    that would be attracted to the earth's south magnetic pole
    E.
    None of the above

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  7. A resistor has a rated value of 100 ohm and a tolerance of 10%. What is its minimum and maximum allowable resistance value?

    8. A.
    90 Ohm - 101 ohm
    B.
    90 Ohm - 110 ohm
    C.
    98 Ohm - 100.1 ohm
    D.
    99 Ohm - 102 ohm
    E.
    None of the above

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  8. When a parallel RLC circuit is operating at its resonant frequency:

    9. A.
    capacitive reactance is greater than the inductive reactance
    B.
    inductive reactance is greater than the capacitive reactance
    C.
    inductive reactance is equal to the capacitive reactance
    D.
    the difference between inductive and capacitive reactance is equal to the resistance
    E.
    None of the above

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  9. For normal operation of the transistor, the collector diode has to be

    10. A.
    Forward-biased
    B.
    Reverse-biased
    C.
    Nonconducting
    D.
    Operating in the breakdown region
    E.
    None of the above

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  10. In a step-down transformer, which is larger?

    11. A.
    Primary voltage
    B.
    Secondary voltage
    C.
    Neither
    D.
    Impossible to say
    E.
    None of the above

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