Relays and switches MCQs

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1. A relay is used to:





2. The basic function of a relay is based on:





3. Which of the following is NOT a typical component of a relay?





4. In a relay, the coil is energized to:





5. A normally open relay contact means that the circuit is:





6. The advantage of using a relay in a circuit is:





7. Which of the following is a typical application of a relay?





8. In a relay, the armature is:





9. The coil of a relay is made of:





10. The primary purpose of a relay’s contacts is to:





11. A switch is a device that is used to:





12. Which type of switch is commonly used to control lights in a room?





13. A push-button switch is typically used for:





14. Which of the following is true for a SPDT (Single Pole Double Throw) switch?





15. A DPST (Double Pole Single Throw) switch has:





16. Which of the following types of switches is used for controlling large industrial machines?





17. A reed switch is typically activated by:





18. A limit switch is used to:





19. A mercury switch operates by:





20. A momentary switch is one that:





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