Previous Year Question
An electromagnetic relay operates primarily on which fundamental physical principle?
Correct answer: C
Explanation
An electromagnetic relay converts an electrical quantity into magnetic force/torque using an energized coil. Depending on the relay construction, operation is based on magnetic attraction or electromagnetic induction.
Step-by-step solution
Correct Answer
C — Magnetic attraction or electromagnetic induction
Explanation
An electromagnetic relay converts an electrical quantity into magnetic force/torque using an energized coil. Depending on the relay construction, operation is based on magnetic attraction or electromagnetic induction.
Key Concept
Electromagnetic Operating Principle
Exam Point
Electromagnetic relay → coil creates magnetic operating force.
Exam tip
Electromagnetic relay → coil creates magnetic operating force.
Quick method
Electromagnetic relay → coil creates magnetic operating force.