3. In D.C. machines, ir order to prevent excessive distortion of field form by the armature reaction, the field mmf must be made

equal to that of armature mmf
less in comparison with the armature mmf
machines, ir order to prevent excessive distortion of field form by the armature reaction, the field mmf must be made A. equal to that of armature mmf B. less in comparison with the armature mmf C. large in comparison with the armature mmf
none of the above

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by the armature reaction, the field mmf must be made" class="read-more button" href="https://exam.pscnotes.com/mcq/in-d-c-machines-ir-order-to-prevent-excessive-distortion-of-field-form-by-the-armature-reaction-the-field-mmf-must-be-made/#more-45279">Detailed SolutionIn D.C. machines, ir order to prevent excessive distortion of field form by the armature reaction, the field mmf must be made

4. In a single phase power factor meter the phase difference between the currents in the two pressure coils is

exactly 0°
approximately 0°
exactly 90°
approximately 90°

Detailed SolutionIn a single

48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTube

phase power factor meter the phase difference between the currents in the two pressure coils is

5. In a low power factor wattmeter the compensating coil is connected

in series with current coil
in parallel with current coil
in series with pressure coil
in parallel with pressure coil

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wattmeter the compensating coil is connected" class="read-more button" href="https://exam.pscnotes.com/mcq/in-a-low-power-factor-wattmeter-the-compensating-coil-is-connected/#more-45024">Detailed SolutionIn a low power factor wattmeter the compensating coil is connected

6. Power transformers have rating

equal to 50 kVA
equal to 100 kVA
above 200 kVA
none of the above

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have rating" class="read-more button" href="https://exam.pscnotes.com/mcq/power-transformers-have-rating/#more-44867">Detailed SolutionPower transformers have rating

7. The rectifier instrument is not free from

temperature error
wave shape error
frequency error
all of the above

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class="read-more button" href="https://exam.pscnotes.com/mcq/the-rectifier-instrument-is-not-free-from/#more-44749">Detailed SolutionThe rectifier instrument is not free from

8. The usual values of maximum flux densities for distribution transformers using hot rolled silicon steel are

0.5 to 0.8 Wb/m2
0.8 to 1.0 Wb/m2
1.1 to 1.35 Wb/m2
1.4 to 1.8 Wb/m2

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are" class="read-more button" href="https://exam.pscnotes.com/mcq/the-usual-values-of-maximum-flux-densities-for-distribution-transformers-using-hot-rolled-silicon-steel-are/#more-44744">Detailed SolutionThe usual values of maximum flux densities for distribution transformers using hot rolled silicon steel are

9. In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at

0°
60°
90°
120°

Detailed SolutionIn a dynamometer

3-phase power factor meter, the planes of the two moving coils are at

10. Which of the following instruments indicate the instantaneous value of the electrical quantity being measured at the time at which it is being measured ?

Absolute instruments
Indicating instruments
Recording instruments
Integrating instruments

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which it is being measured ?" class="read-more button" href="https://exam.pscnotes.com/mcq/which-of-the-following-instruments-indicate-the-instantaneous-value-of-the-electrical-quantity-being-measured-at-the-time-at-which-it-is-being-measured/#more-44341">Detailed SolutionWhich of the following instruments indicate the instantaneous value of the electrical quantity being measured at the time at which it is being measured ?

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