Basic Electrical & Electronics Question Bank
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Questions and Answers

How many cycles will an AC signal complete in 2 seconds if its frequency is 100 Hz?

  • 100 (correct)
  • 150
  • 200
  • 50

    • What is the range in which the power factor of an AC voltage typically lies?

  • 0 and 1 (correct)
  • 2 and 3
  • 1 and 2
  • 3 and 4

    • What do alternating current voltages have in terms of phases and neutral points?

  • Phase
  • Neutral
  • Both a and b (correct)
  • None of the above

    • In India, what are the standard values for voltage and frequency in electricity systems?

    <p>230 volts and 50 hertz (C)</p> Signup and view all the answers

    The period of a wave is directly related to which of the following quantities?

    <p>Time (B)</p> Signup and view all the answers

    Which unit is used to express frequency in cycles per second?

    <p>Frequency (B)</p> Signup and view all the answers

    When waveform-1 starts from the origin and waveform-2 starts from π/2, what relationship is defined between them?

    <p>Waveform-1 leads waveform-2 (A)</p> Signup and view all the answers

    What is the average value of the following currents: 5A, 6A, 7A?

    <p>6A (A)</p> Signup and view all the answers

    What is the primary function of a transformer?

    <p>Steps up or down AC voltages (C)</p> Signup and view all the answers

    In a transformer with a primary winding supplied with 120V AC and a turn ratio of 10, what is the secondary voltage?

    <p>12000 V (A)</p> Signup and view all the answers

    Why are transformer cores laminated?

    <p>Reduce eddy current and hysteresis loss (B)</p> Signup and view all the answers

    Which parameter does not change in an ordinary transformer?

    <p>Frequency (B)</p> Signup and view all the answers

    In an ideal transformer, what is true about the windings and core?

    <p>All of these (D)</p> Signup and view all the answers

    What material is the core of a transformer typically made of?

    <p>Iron (C)</p> Signup and view all the answers

    What is the primary function of the stator in an electric motor?

    <p>Generate a magnetic field to interact with the rotor (A)</p> Signup and view all the answers

    Which type of motor uses brushes and a commutator?

    <p>DC motor (B)</p> Signup and view all the answers

    What determines the direction of rotation of a DC motor according to the text?

    <p>Fleming’s right-hand rule (B)</p> Signup and view all the answers

    What is true about hysteresis loss according to the text?

    <p>It is directly proportional to frequency (C)</p> Signup and view all the answers

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