Understanding Governors and the Question

Governors are essential mechanical devices used to regulate the speed of an engine or turbine. They automatically control the supply of fuel or working fluid to maintain a nearly constant speed despite changes in load. The question describes a specific type of governor based on its unique construction.

Analyzing the Governor Description

The question provides several key characteristics of the governor:

• It has three straight leaf springs.
• These springs are arranged at equal angular intervals (radially) around a spindle.
• Each spring carries a weight at its center.
• As the spindle rotates and speed increases, the weights move outwards due to centrifugal force.
• This outward movement causes the springs to bend.

We need to identify which type of governor fits this description.

Examining the Options

Let's look at the characteristics of the given options:

Pickering Governor

The Pickering governor is a type of spring-loaded governor. Its characteristic design involves multiple (often three) flat leaf springs arranged radially around the governor spindle. Weights are attached to the center of these springs. As the spindle speed increases, centrifugal force acts on the weights, causing them to move outwards and bend the springs. This movement is linked to the throttle valve, regulating the engine speed. This description perfectly matches the details provided in the question.

Hartung Governor

The Hartung governor is also a spring-loaded governor. However, it typically uses bell crank levers with weights and a single spring mounted on one of the arms or acting axially, not multiple radial leaf springs.

Hartnell Governor

The Hartnell governor is a widely used spring-loaded governor that employs bell crank levers pivoted on a frame rotating with the spindle. Weights are attached to the ends of one arm of the levers, and the other arm presses against a sleeve. A compression spring controls the movement of the sleeve. It does not use radial leaf springs with central weights as described.

Porter Governor

The Porter governor is a loaded type of centrifugal governor. It is similar to a Watt governor but has an additional central load on the sleeve. It uses links and arms connected to balls (weights) and a sleeve, not leaf springs.

Matching Description to Governor Type

Comparing the description in the question with the characteristics of each governor type:

• Three straight leaf springs arranged radially.
• Weights at the center of each spring.
• Weights move outwards bending springs as speed increases.

This specific design is a hallmark of the Pickering Governor.

Conclusion

Based on the distinctive construction featuring three radial leaf springs with central weights that bend outwards under centrifugal force, the governor described is the Pickering Governor.