Question 1 of 20
Q
The purpose of a temperature sensing device installed in the stack of a small automatically fired auxiliary steam boiler is to secure the oil burner __________.
A
in the event of a flame failure
B
in the event of a stack fire
C
when the water level reaches the crown sheet
D
when the feed pump discharge pressure drops to a preset minimum
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Question 1 / 205eccefa3bacbc34ba4d47c55
Question 1 of 205eccefa3bacbc34ba4d47c55

The purpose of a temperature sensing device installed in the stack of a small automatically fired auxiliary steam boiler is to secure the oil burner __________.

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The purpose of a temperature sensing device installed in the stack of a small automatically fired auxiliary steam boiler is to secure the oil burner __________.

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🔍 Key Concepts

• Automatically fired auxiliary steam boilers – what conditions must cause the burner to shut down for safety • Where a stack (uptake) temperature sensing device is located and what it is actually measuring • Differences between flame failure protection, low-water protection, and feed pump/pressure protection

đź’­ Think About

• Ask yourself: What change in the stack would be detected FIRST if the burner stopped burning properly, but fuel was still being supplied? • Which of the listed events would most directly and quickly show up as an unusual stack temperature pattern rather than a pressure or water-level change? • Consider what specific accident or unsafe condition the designer wants to prevent by watching the temperature in the stack, not in the boiler drum or feed system.

âś… Before You Answer

• Match the device location: a sensor in the stack will mainly detect changes in exhaust/flue gas temperature, not water level or pump pressure. • Review typical boiler safety systems: low-water cutout, feed pump pressure switches, and flame scanners/temperature devices — which one belongs where? • Decide which choice best connects a change in stack temperature with an immediate need to shut off fuel to the burner to prevent damage or unsafe conditions.

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