Electrical Engineering : Magnetic Circuit QUESTIONS AND ANSWERS :: part1 : 16 to 20
Following Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
16.Relative permeability of vacuum is |
| 1 |
| 1 H/m |
| 1/4JI |
| 4n x 10-' H/m |
17.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 |
18.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 |
19.Conductance is analogous to |
| permeance |
| reluctance |
| flux |
| inductance |
20.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 |
More Magnetic Circuit QUESTIONS AND ANSWERS available in next pages
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