Red Seal Electrician Practice
Motor controlsQuestion 231 of 1506

A lamp must flash on and off at a steady rate. Which relay arrangement is used?

  1. A solid-state relay with no timer at all
  2. A single watchdog timer relay on its own
  3. Two time-delay relays working together
  4. A protective voltage relay on a breaker
Show answer

Correct answer: Two time-delay relays working together

Two time-delay relays give a constant on and off pulsing of contacts to the lamp.

Source: Lessons in Electric Circuits IV: Digital (Kuphaldt), 5.3: Time-delay Relays

Practice motor controls

Questions last reviewed: 18 October 2026