Which of the following choices should be done to ensure proper air-to-fuel ratio?

The correct choice involves adjusting the air intake as necessary to ensure a proper air-to-fuel ratio. This balance is crucial for efficient combustion in an oil burner.

Maintaining the right air-to-fuel ratio is essential because it influences the efficiency of the burner and the quality of combustion. If there is too much air (excess oxygen), it can result in inefficient burning and energy loss, whereas insufficient air can lead to incomplete combustion, producing harmful emissions such as carbon monoxide and soot.

By adjusting the air intake, operators can fine-tune the mix of air and fuel to optimize combustion conditions. This may involve opening or closing intake dampers or modifying fan speeds, depending on the design of the burner. Thus, ensuring the correct proportion of air and fuel entering the burner is vital for safe and efficient operation.

In contrast, increasing fuel supply alone does not address the necessary relationship with air and may lead to improper combustion. Similarly, reducing burner temperature or decreasing fuel pressure without adjusting air intake will not correct the air-to-fuel balance and may even exacerbate efficiency and safety issues.