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10. In a transformer, the leakage flux of each wind- ing is proportional to the current in that winding because (a) Ohm's law applies to magnetic circuits (b) leakage paths do not saturate (c) the two windings are electrically isolated (d) mutual flux is confined to the core.

10. In a transformer, the leakage flux of each wind- ing is proportional to the current in that winding because (a) Ohm's law applies to magnetic circuits (b) leakage paths do not saturate (c) the two windings are electrically isolated (d) mutual flux is confined to the core.

Power System Analysis and Design (MindTap Course List)
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 3.1MCQ: The Ohms law for the magnetic circuit states that the net magnetomotive force (mmf) equals the...
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(a) different number of turns (b) same size of copper wire (c) a common magnetic circuit (d) separate magnetic circuits. 10. In a transformer, the leakage flux of each wind- ing is proportional to the current in that winding because (a) Ohm's law applies to magnetic circuits (b) leakage paths do not saturate (c) the two windings are electrically isolated (d) mutual flux is confined to the core. 11. In a two-winding transformer, the e.m.f.per turn in secondary winding is always.........the induced e.m.f. power turn in primary. (a) equal to K times (b) equal to 1/K times (c) equal to (d) greater than. 12. In relation to a transformer, the ratio 20: 1 indi- cates that (a) there are 20 turns on primary one turn on secondary (b) secondary voltage is 1/20th of primary voltage (c) primary current is 20 times greater than the secondary current. (d) for every 20 turns on primary, there is one turn on secondary. 13. In performing the short circuit test of a trans- former (a) high voltage side is usually short circuited (b) low voltage side is usually short circuited (c) any side is short circuited with preference (d) none of the above. woll 01.0 (Elect. Machines, A.M.I.E. Sec. B, 1993) 14. The equivalent resistance of the primary of a transformer having K = 5 and R₁ = 0.1 ohm when referred to secondary becomes........ohm. (a) 0.5 (b) 0.02 (c) 0.004 (d) 2.5 15. A transformer has negative voltage regulation when its load power factor is (a) zero (b) unity o (c) leading (d) lagging.
Transcribed Image Text:(a) different number of turns (b) same size of copper wire (c) a common magnetic circuit (d) separate magnetic circuits. 10. In a transformer, the leakage flux of each wind- ing is proportional to the current in that winding because (a) Ohm's law applies to magnetic circuits (b) leakage paths do not saturate (c) the two windings are electrically isolated (d) mutual flux is confined to the core. 11. In a two-winding transformer, the e.m.f.per turn in secondary winding is always.........the induced e.m.f. power turn in primary. (a) equal to K times (b) equal to 1/K times (c) equal to (d) greater than. 12. In relation to a transformer, the ratio 20: 1 indi- cates that (a) there are 20 turns on primary one turn on secondary (b) secondary voltage is 1/20th of primary voltage (c) primary current is 20 times greater than the secondary current. (d) for every 20 turns on primary, there is one turn on secondary. 13. In performing the short circuit test of a trans- former (a) high voltage side is usually short circuited (b) low voltage side is usually short circuited (c) any side is short circuited with preference (d) none of the above. woll 01.0 (Elect. Machines, A.M.I.E. Sec. B, 1993) 14. The equivalent resistance of the primary of a transformer having K = 5 and R₁ = 0.1 ohm when referred to secondary becomes........ohm. (a) 0.5 (b) 0.02 (c) 0.004 (d) 2.5 15. A transformer has negative voltage regulation when its load power factor is (a) zero (b) unity o (c) leading (d) lagging.
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