Oilers/Plant Tenders (HHC) Civil Service Practice Exam

A proper functioning choke contributes to what aspect of engine start-up?

1. Fuel efficiency

2. Quick starting

3. Reduced emissions

4. Enhanced power

The correct answer is: Quick starting

A properly functioning choke plays a crucial role in ensuring quick starting of an engine, especially in cold weather conditions. The choke restricts the airflow into the engine, creating a richer fuel mixture. This richer mixture is essential when the engine is cold because it helps the engine to start more easily by providing more fuel than air during the initial moments of operation. When the choke is engaged, it essentially allows the fuel to vaporize more effectively, aiding in combustion when the engine is not yet at optimal operating temperature. This is particularly important in small engines, such as those found in lawn mowers and chainsaws, or in older vehicles that utilize carbureted engines. While aspects like fuel efficiency, reduced emissions, and enhanced power can be influenced by the overall engine performance and efficiency, they are not the primary focus of a choke's operation during the start-up process. The choke specifically facilitates a quicker engine start by ensuring that the appropriate air-fuel mixture is delivered when the engine needs it most.