The controller set point of an automatic...

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Question 1 of 205eccefa5bacbc34ba4d48809

The controller set point of an automatic control system is 150°F (65.5°C). The valve closes when the output temperature reaches 160°F (71.1°C), and reopens when the temperature falls below 140°F (60°C).The type of positioning action in this controller is known as __________.

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🔍 Key Concepts

• On-off (two-position) control vs proportional control in automatic systems • Meaning of single-point vs differential (deadband or hysteresis) gap in temperature control • How opening and closing at two different temperatures affects system operation

💭 Think About

• Ask yourself: Does this controller operate at just one exact temperature, or does it switch at two different temperatures? What does that imply about a gap or hysteresis? • Consider whether the valve has only two states (fully open or fully closed), or if it can take intermediate positions. How does that relate to one-position vs two-position? • Look at the 140°F and 160°F values: how do they compare to the 150°F set point, and what does the difference between them represent?

✅ Before You Answer

• Verify whether two distinct switch temperatures (open vs close) means there is a differential or deadband around the set point. • Check if two-position usually describes devices that are simply ON/OFF or OPEN/CLOSED, not modulating. • Confirm that single-point control means switching at one temperature only, while differential-gap involves a range between on and off points.

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