Transformer Principles in Aircraft Electrical Systems
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Questions and Answers

What happens when a magnet is suspended to swing freely?

  • It aligns itself with the earth's magnetic poles (correct)
  • It remains stationary and does not move
  • It changes its shape to conform to its surroundings
  • It aligns itself with the earth's gravitational poles

    • What is the function of the magnetic field surrounding a magnet?

  • It reduces the strength of the magnet
  • It arranges itself to conform to the shape of the magnet (correct)
  • It repels other magnets
  • It attracts other magnets

    • What is the primary principle behind the generation of AC voltage in a generator?

  • A conductor passing through lines of magnetic force (correct)
  • A coil rotating in a gravitational field
  • A stationary coil in a changing gravitational field
  • A magnet rotating in a stationary conductor

    • What determines the strength of the induced voltage in a generator?

    <p>The speed of the conductor and the strength of the magnetic field</p> Signup and view all the answers

    What is the purpose of labeling the ends of a magnet as 'N' and 'S'?

    <p>To distinguish the north-seeking and south-seeking ends of the magnet</p> Signup and view all the answers

    What is the earth's role in the behavior of magnets?

    <p>It is a giant magnet, with its poles attracting the ends of other magnets</p> Signup and view all the answers

    What is a characteristic of a shunt DC motor?

    <p>Constant current through the field</p> Signup and view all the answers

    Which type of DC motor is suitable for applications where constant speed is desired and high starting torque is not needed?

    <p>Shunt motor</p> Signup and view all the answers

    What is the primary difference between a shunt and a series DC motor?

    <p>The connection of the field winding to the armature</p> Signup and view all the answers

    What is the purpose of the series winding in a compound DC motor?

    <p>To provide a high starting torque</p> Signup and view all the answers

    What is the characteristic of a compound DC motor's speed with load?

    <p>It varies less than in a series wound motor</p> Signup and view all the answers

    What is the number of windings in the field of a compound DC motor?

    <p>Two</p> Signup and view all the answers

    What is the relationship between the effective value and the peak value of an AC circuit?

    <p>The effective value is equal to 0.707 times the peak value.</p> Signup and view all the answers

    Why are AC meters typically calibrated to display the effective value?

    <p>Because it is the approximate DC voltage of the same value.</p> Signup and view all the answers

    What is the assumption made when a value is given for current or voltage in an AC circuit?

    <p>The value is always the effective value unless otherwise specified.</p> Signup and view all the answers

    What is the purpose of specifying the effective value in AC circuits?

    <p>To provide a practical and useful measurement for AC circuits.</p> Signup and view all the answers

    What is the relationship between the effective value and the heat produced in a resistor?

    <p>The effective value produces the same heat as the peak value.</p> Signup and view all the answers

    What is the term used to describe the mathematical process of deriving the effective value?

    <p>Root mean square (RMS) value.</p> Signup and view all the answers

    What is the primary purpose of a voltage transformer?

    <p>To step up or step down voltages</p> Signup and view all the answers

    What is the primary difference between the primary windings of voltage and current transformers?

    <p>The connection method in the primary circuit</p> Signup and view all the answers

    What is the name of the law that describes the current flow in the primary coil when voltage is applied?

    <p>Faraday's Law of Electromagnetic Induction</p> Signup and view all the answers

    What is the primary function of the soft iron core in a transformer?

    <p>To form a path and concentrate the magnetic flux</p> Signup and view all the answers

    What determines the strength of the magnetic field induced in a transformer?

    <p>The amount of current and number of turns in the winding</p> Signup and view all the answers

    What is the name of the phenomenon that occurs when a current flows through the primary coil and sets up a magnetic field?

    <p>Mutual inductance</p> Signup and view all the answers

    What is the characteristic of semiconductor materials?

    <p>Offering a resistance between the best conductors and insulators</p> Signup and view all the answers

    Which of the following is a poor conductor of electricity?

    <p>Rubber</p> Signup and view all the answers

    What is the relationship between the length of a wire and its resistance?

    <p>The longer the length, the greater the resistance</p> Signup and view all the answers

    What happens to the resistance of a conductor when its cross-sectional area is doubled?

    <p>The resistance is reduced in half</p> Signup and view all the answers

    What is the effect of temperature on the resistance of most conductors?

    <p>The resistance increases as temperature increases</p> Signup and view all the answers

    Why does the resistance of a conductor decrease when its cross-sectional area is increased?

    <p>The electrons move without collision in the increased area</p> Signup and view all the answers

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