Which statement is true about normally closed contacts?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $25.99Unlock all

Prepare for the NCCER Electrical Level 2 Control Systems and Fundamental Concepts exam. Utilize flashcards and multiple choice questions with hints and explanations. Ensure success on your exam!

Multiple Choice

Which statement is true about normally closed contacts?

Explanation:
Normally closed contacts conduct in their resting state. When the control coil is energized, the magnetic field moves the contact so it opens, breaking the circuit. That makes the statement true: they are closed when the coil is de-energized. This behavior is the opposite of normally open contacts, which are open when de-energized and close when energized. In practice, NC contacts are used in circuits where a push to energize should interrupt current, or where a loss of power leaves the circuit intact before energizing changes the state.

Normally closed contacts conduct in their resting state. When the control coil is energized, the magnetic field moves the contact so it opens, breaking the circuit. That makes the statement true: they are closed when the coil is de-energized. This behavior is the opposite of normally open contacts, which are open when de-energized and close when energized. In practice, NC contacts are used in circuits where a push to energize should interrupt current, or where a loss of power leaves the circuit intact before energizing changes the state.

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy