Magnetic Circuit 1(TTA)

22 Questions | Attempts: 928
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    The unit of magnetic flux is

    • Henry
    • Weber
    • Ampereturn/weber
    • Ampere/metre
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. INSTRUCTIONS
1. NUMBER OF QUESTIONS 22
2. HAS A TIME LIMIT OF 20 MINUTES
3. HAS A PASS MARKS OF 30%
4. QUESTIONS PER PAGE 1
5. EACH QUESTIONS HAS 1 MARKS
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Magnetic Circuit 1(TTA) - Quiz

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  • 2. 

    Those magnetic materials are best suited for making armature and transformer cores which have____permeability and_______hystersis loss.

    • High,high

    • Low,high

    • High,low

    • Low,low

    Correct Answer
    A. High,low
  • 3. 

    If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be

    • Zero

    • Small

    • Large

    • None of the above

    Correct Answer
    A. Large
  • 4. 

    Laminated cores, in electrical machines, are used to reduce

    • Copper loss

    • Eddy current loss

    • Hysteresis loss

    • All of the above

    Correct Answer
    A. Eddy current loss
  • 5. 

    When both the inductance and resistance of a coil are doubled the value of

    • Time constant remains unchanged

    • Initial rate of rise of current is doubled

    • Final steady current is doubled

    • Time constant is halved

    Correct Answer
    A. Time constant remains unchanged
  • 6. 

    Silicon steel is used in electrical machines because it has

    • Low co-ercivity

    • Low retentivity

    • Low hysteresis loss

    • High co-ercivity

    Correct Answer
    A. Low hysteresis loss
  • 7. 

    Permeability in a magnetic circuit corresponds to______ in an electric circuit.

    • Resistance

    • Resistivity

    • Conductivity

    • Conductance

    Correct Answer
    A. Conductivity
  • 8. 

    Conductivity is analogous to

    • Retentivity

    • Resistivity

    • Permeability

    • Inductance

    Correct Answer
    A. Permeability
  • 9. 

    The property of a material which opposes the creation of magnetic flux in it is known as

    • Reluctivity

    • Magnetomotive force

    • Permeance

    • Reluctance

    Correct Answer
    A. Reluctance
  • 10. 

    .Permanent magnets are normally made of

    • Alnico alloys

    • Aluminium

    • Cast iron

    • Wrought iron

    Correct Answer
    A. Alnico alloys
  • 11. 

    Conductance is analogous to

    • Permeance

    • Reluctance

    • Flux

    • Inductance

    Correct Answer
    A. Permeance
  • 12. 

    While comparing magnetic and electric circuits, the flux of magnetic circuit is compared with which parameter of electrical circuit ?

    • E.m.f.

    • Current

    • Current density

    • Conductivity

    Correct Answer
    A. Current
  • 13. 

    Relative permeability of vacuum is

    • 1

    • 1 H/m

    • 1/4JI

    • 4n x 10-' H/m

    Correct Answer
    A. 1
  • 14. 

    Point out the wrong statement. Magnetic leakage is undesirable in electric machines because it

    • Lowers their power efficiency

    • Increases their cost of manufacture

    • Leads to their increased weight

    • Produces fringing

    Correct Answer
    A. Lowers their power efficiency
  • 15. 

    Hard steel is suitable for making permanent magnets because

    • It has good residual magnetism

    • Its hysteresis loop has large area

    • Its mechanical strength is high

    • Its mechanical strength is low

    Correct Answer
    A. It has good residual magnetism
  • 16. 

    The unit of retentivity is

    • Weber

    • Weber/sq. m

    • Ampere turn/metre

    • Ampere turn

    Correct Answer
    A. Weber/sq. m
  • 17. 

    A material for good magnetic memory should have

    • Low hysteresis loss

    • High permeability

    • Low retentivity

    • High retentivity

    Correct Answer
    A. High retentivity
  • 18. 

    Those materials are well suited for making permanent magnets which have______retentivity and _______coercivity.

    • Low, high

    • High, high

    • High, low

    • Low, low

    Correct Answer
    A. High, high
  • 19. 

    The rate of rise of current through an inductive coil is maximum

    • At 63.2% of its maximum steady value

    • At the start of the current flow

    • After one time constant

    • Near the final maximum value of current

    Correct Answer
    A. At the start of the current flow
  • 20. 

    .A ferrite core has less eddy current loss than an iron core because

    • Ferrites have high resistance

    • Ferrites are magnetic

    • Ferrites have low permeability

    • Ferrites have high hysteresis

    Correct Answer
    A. Ferrites have high hysteresis
  • 21. 

    In a magnetic material hysteresis loss takes place primarily due to

    • Rapid reversals of its magnetisation

    • Flux density lagging behind magnetising force

    • Molecular friction

    • It high retentivity

    Correct Answer
    A. It high retentivity
  • 22. 

    The unit of reluctance is

    • Meter/Henry

    • Henry/Meter

    • Henry

    • 1/Henry

    Correct Answer
    A. Henry

Quiz Review Timeline (Updated): Mar 20, 2022 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 20, 2022
    Quiz Edited by
    ProProfs Editorial Team
  • Jul 23, 2016
    Quiz Created by
    Harish.hot04
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