2.Fringing effect is a phenomena occurs in...(a)Transformers.(b) Electrical field.(c) Air gap(d) All of the above.3. The kVA rating of an ordinary 2-winding transformer is increased when connected as anautotransformer because(a) transformation ratio is increased(b) secondary voltage is increased(c) energy is transferred both inductively and conductivity(d) secondary current is increased.4. The....... of the hysteresis loop is a measure of energy lost per cycle(a) area.(b) Type.(c) Frequency(d) No one of the above.5. At relatively light loads, transformer efficiency is low because(a) secondary output is low(b) transformer losses are high(c) fixed loss is high in proportion to the output(d) Cu loss is small.6. In an ideal transformer,(a) windings have no resistance(b) core has no losses(c) core has infinite permeability(d) all of the above.7. In electromagnetic circuits, path of eddy current is........(a) Parallel to the path of the flux.(b) Perpendicular to the path of the flux. -(c) Out of the path of the flux.(d) No one of the above.8. The main purpose of performing open-circuit test on a transformer is to measure its(a) Cu loss(b) core loss(c) total loss(d) both Cu and total losses.9. During short-circuit test, the iron loss of a transformer is negligible because(a) the entire input is just sufficient to meet Cu losses only(b) flux produced is a small fraction of the normal flux(c) iron core becomes fully saturated(d) supply frequency is held constant.10. A transformer has negative voltage regulation when its load power factor is(a) zero(b) unity(c) leading(d) lagging.1

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Answered: 2.Fringing effect is a phenomena occurs…

2.Fringing effect is a phenomena occurs in ........... (a) Transformers. (b) Electrical field. (c) Air gap (d)All of the above.

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.9P

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Concept explainers

Single Phase Transformer

A single-phase transformer is a type of power transformer. It is an electrical device that accepts converts the single phase alternating power into single phase alternating power. In this power conversion the voltage is stepped up or down. If the voltage is stepped up, the current will be stepped down and if the voltage is stepped down, the current will be stepped up.

Question

2.Fringing effect is a phenomena occurs in...
(a)Transformers.
(b) Electrical field.
(c) Air gap
(d) All of the above.
3. The kVA rating of an ordinary 2-winding transformer is increased when connected as an
autotransformer because
(a) transformation ratio is increased
(b) secondary voltage is increased
(c) energy is transferred both inductively and conductivity
(d) secondary current is increased.
4. The....... of the hysteresis loop is a measure of energy lost per cycle
(a) area.
(b) Type.
(c) Frequency
(d) No one of the above.
5. At relatively light loads, transformer efficiency is low because
(a) secondary output is low
(b) transformer losses are high
(c) fixed loss is high in proportion to the output
(d) Cu loss is small.
6. In an ideal transformer,
(a) windings have no resistance
(b) core has no losses
(c) core has infinite permeability
(d) all of the above.
7. In electromagnetic circuits, path of eddy current is........
(a) Parallel to the path of the flux.
(b) Perpendicular to the path of the flux. -
(c) Out of the path of the flux.
(d) No one of the above.
8. The main purpose of performing open-circuit test on a transformer is to measure its
(a) Cu loss
(b) core loss
(c) total loss
(d) both Cu and total losses.
9. During short-circuit test, the iron loss of a transformer is negligible because
(a) the entire input is just sufficient to meet Cu losses only
(b) flux produced is a small fraction of the normal flux
(c) iron core becomes fully saturated
(d) supply frequency is held constant.
10. A transformer has negative voltage regulation when its load power factor is
(a) zero
(b) unity
(c) leading
(d) lagging.
1

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