Practice - Open-Circuit Test (No-Load Test): Unveiling Core Losses and Excitation Parameters
Practice Questions
Test your understanding with targeted questions
What is the main purpose of the open-circuit test?
💡 Hint: Think about how transformers function without a load.
List two components of no-load current during the test.
💡 Hint: Consider the current's phase relationship with voltage.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is the small current drawn during the open-circuit test called?
💡 Hint: Focus on the test’s operational conditions to answer.
True or False: Core losses are variable losses that depend on the load.
💡 Hint: Consider the nature of core losses separated from load-dependent factors.
1 more question available
Challenge Problems
Push your limits with advanced challenges
A 2 kVA transformer shows a wattmeter reading of 40 W during an open-circuit test with a 115 V voltage applied. If the no-load current measured is 0.35 A, calculate the core loss resistance.
💡 Hint: Use the relationship between core loss current and the voltage to find resistance.
Transformers exhibit various degrees of core loss. If another transformer shows varying readings during tests, how would you determine the quality of the magnetic core material?
💡 Hint: Think about how core material selection impacts performance measurements over typically tested parameters.
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