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EI · Practice test 2 of 8

Electronics Information Practice Test 2

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  1. Question 1 easy

    Which basic unit is used to measure electrical inductance?

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    Correct answer: A — henry

    The henry (H) is the SI unit of electrical inductance, named after Joseph Henry.

  2. Question 2 easy

    Which output device acts as a transducer converting electrical energy into sound waves?

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    Correct answer: A — speaker

    A speaker (or loudspeaker) is an electroacoustic transducer that converts an electrical audio signal into corresponding sound waves.

  3. Question 3 easy

    What unit of measurement is indicated by the symbol pF in electronic circuits?

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    Correct answer: A — picofarads

    The symbol pF stands for picofarad, a metric unit of electrical capacitance equal to $$10^{-12}$$ farads.

  4. Question 4 medium

    Three parallel capacitors have values of 10 µF, 20 µF, and 30 µF. What is the total equivalent capacitance of this circuit?

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    Correct answer: A — 60 microfarads

    For capacitors connected in parallel, total capacitance is the sum of individual capacitances: $$C_{\text{total}} = 10 + 20 + 30 = 60$$ µF.

  5. Question 5 medium

    Which adjustable component utilizes a rotating shaft attached to a contact wiper to vary resistance across a resistive element?

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    Correct answer: A — potentiometer

    A potentiometer is a three-terminal variable resistor with a sliding or rotating contact (wiper) that forms an adjustable voltage divider or resistance control.

  6. Question 6 medium

    What specific rating indicates the maximum continuous current a conductor or circuit component can safely carry without exceeding its temperature limits?

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    Correct answer: A — ampacity rating

    Ampacity (or current-carrying capacity) is the maximum amount of electric current a conductor or device can handle continuously before suffering thermal degradation.

  7. Question 7 medium

    Which parameter determines the factor by which an ideal step-up or step-down transformer changes alternating voltage levels?

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    Correct answer: A — turns ratio of the primary to secondary coils

    The voltage transformation ratio of a transformer is directly proportional to its turns ratio $$(V_s / V_p = N_s / N_p)$$

  8. Question 8 hard

    A step-down transformer has 800 turns in its primary winding and 200 turns in its secondary winding. If the primary voltage is 120 V AC, what is the secondary output voltage?

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    Correct answer: A — 30 V AC

    Using the transformer formula $$V_s = V_p \times (N_s / N_p)$$: $$V_s = 120\text{ V} \times (\frac{200}{800}) = 120\text{ V} \times 0.25 = 30\text{ V}$$ AC.

  9. Question 9 hard

    Which of the following thermal interface materials is specifically chosen in high-power semiconductor assemblies due to its high thermal conductivity and electrical insulating properties?

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    Correct answer: A — beryllium oxide ceramics

    Beryllium oxide (BeO) ceramics feature extremely high thermal conductivity combined with high electrical resistance, making them ideal insulator heat sinks for power electronics.

  10. Question 10 hard

    An AC electrical circuit operates at a voltage of 230 V RMS and draws a current of 4 A with a power factor of 0.85. What is the real electrical power dissipated in watts?

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    Correct answer: A — 782 watts

    Real electric power in an AC circuit is calculated as $$P = V \times I \times \text{Power Factor} = 230\text{ V} \times 4\text{ A} \times 0.85 = 782\text{ W}$$