Question

1. flame rollout switches are high-limit switches placed where?
2. what causes the flame rollout switches to activate? and what causes it?
3. what does the flame rollout switch disable?

Explanation:

(for sub - question 7):
Flame rollout switches are high - limit switches placed in the burner compartment, typically near the burners and along the path where flames could roll out (e.g., at the front or sides of the burner assembly in a furnace or heating system). This is related to the subfield of Engineering (specifically HVAC or mechanical engineering) as it pertains to the design and safety of heating systems.

(for sub - question 8):
Flame rollout switches activate when the temperature in their vicinity reaches a pre - set high limit. The causes of this high temperature (and thus switch activation) include a blocked heat exchanger (which can cause flames to roll out of the burner area), improper burner operation (like uneven burning), or a lack of proper ventilation in the burner compartment. This is relevant to Engineering (HVAC/mechanical) as it deals with the operational and safety aspects of heating equipment.

(for sub - question 9):
The flame rollout switch disables the burner (the ignition and fuel supply to the burner) to prevent the spread of flames outside the intended burner area, thereby preventing fire hazards and damage to the heating system or surrounding components. This is part of the safety design in Engineering (HVAC/mechanical) systems.

Answer:

(for sub - question 7):
Flame rollout switches are high - limit switches placed in the burner compartment (near burners, along potential flame roll - out paths, e.g., front/sides of burner assembly in heating systems).