10.a. Most of the power transformers that you will find in commercial and industrial applications are either three-phase or A. two-phase B. single-phase C. zero-phase D. four-phase 10.b. The percent regulation for a transformer whose secondary voltage goes from 150 V at no load to 140 V at full load is A. 10.7% B. 9.3% C. 6.7% D. 7.1% 10.c. Three single-phase transformers are connected in ∆ - ∆. Each of these transformers has a secondary phase current of 10 A. The value of the secondary line current is A. 578 A B. 17.3 A C. 57.8 A D. 1.73 A

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 3.34P: Three single-phase, two-winding transformers, each rated 450MVA,20kV/288.7kV, with leakage reactance...
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 10.a. Most of the power transformers that you will find in commercial and industrial applications are either three-phase or
A. two-phase
B. single-phase
C. zero-phase
D. four-phase
10.b. The percent regulation for a transformer whose secondary voltage goes from 150 V at no load to 140 V at full load is
A. 10.7%
B. 9.3%
C. 6.7%
D. 7.1%
10.c. Three single-phase transformers are connected in ∆ - ∆. Each of these transformers has a secondary phase current of 10 A. The value of the secondary line current is
A. 578 A
B. 17.3 A
C. 57.8 A
D. 1.73 A

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