Which of the following methods can be used for trap testing?

The method involving temperature, visual observation, sound, and ultrasonic testing is comprehensive and effective for trap testing.

Temperature measurement can help determine whether the trap is operating at the correct levels, as an unexpected temperature variation may indicate a malfunction. Visual inspection allows for the identification of physical issues, leaks, or corrosion that could affect the trap’s function. Sound testing, including listening for abnormal noises, can reveal operational issues such as blockages or the presence of steam, which should not typically be heard if the trap is functioning properly. Ultrasonic testing is a sophisticated method that can detect sound waves beyond human hearing, providing insights into the condition of the trap and potential failures with greater sensitivity.

These combined approaches offer a thorough assessment of both the mechanical integrity and operational effectiveness of the trap, making it the most reliable method among the options for ensuring that traps are functioning as they should.