Governor Types: Loaded vs. Unloaded

Governors are devices used to regulate the speed of engines. They can be classified based on how they counteract the centrifugal force.

• Loaded Governors: Require an external force (like a dead weight or spring) to be overcome by the centrifugal force for operation. This makes their action more sensitive to changes in load.
• Unloaded Governors: Rely solely on the centrifugal force generated by the rotating balls. The Watt governor is a prime example.

Analyzing Governor Types

Let's examine the options provided in the context of loaded versus unloaded governors:

• Dead weight governor: This is a category that includes governors where a specific weight is added to increase sensitivity and stability. These are generally considered loaded governors (e.g., Porter governor).
• Spring controlled governor: These governors use springs instead of weights to provide the necessary restoring force. The spring force acts as a load, making them loaded governors.
• Watt governor: This is the simplest type of governor. It uses only the centrifugal force acting on the rotating balls. It does not incorporate any additional weight or spring mechanism to counteract the centrifugal force, making it an unloaded governor.
• Porter governor: This governor is an evolution of the Watt governor, incorporating a central dead weight. This added weight increases the effort required to raise the sleeve, making it a loaded governor.

Identifying the Unloaded Governor

The question asks for the type that is NOT a loaded governor. Based on the analysis:

• Watt governor relies only on centrifugal force.
• Porter, Spring-controlled, and Dead weight governors involve additional forces (weights or springs) that classify them as loaded types.

Therefore, the Watt governor is the correct answer as it is an unloaded type.