3. Transformers are rated in kVA instead of kW because (a) load power factor is often not known (b) kVA is fixed whereas kW depends on load p.f. (c) total transformer loss depends on volt- ampere (d) it has become customary. 4. When a 400-Hz transformer is operated at 50 Hz its kVA rating is (a) raduced to 1/8 (b) increased 8 times (c) unaffected (d) increased 64 times. 5. At relatively light loads, transformer efficiency is low because 7 (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.
3. Transformers are rated in kVA instead of kW because (a) load power factor is often not known (b) kVA is fixed whereas kW depends on load p.f. (c) total transformer loss depends on volt- ampere (d) it has become customary. 4. When a 400-Hz transformer is operated at 50 Hz its kVA rating is (a) raduced to 1/8 (b) increased 8 times (c) unaffected (d) increased 64 times. 5. At relatively light loads, transformer efficiency is low because 7 (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.
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
Related questions
Question
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
Step by step
Solved in 2 steps
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Recommended textbooks for you
Power System Analysis and Design (MindTap Course …
Electrical Engineering
ISBN:
9781305632134
Author:
J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:
Cengage Learning
Power System Analysis and Design (MindTap Course …
Electrical Engineering
ISBN:
9781305632134
Author:
J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:
Cengage Learning