Oilers/Plant Tenders (HHC) Civil Service Practice Exam

Disable ads (and more) with a membership for a one time $2.99 payment

Prepare for the Oilers/Plant Tenders Test with comprehensive flashcards and multiple choice questions. Each question includes hints and explanations. Enhance your readiness for the exam!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

What is the main purpose of a hand-operated choke in gasoline engines?

To restrict air for efficient burning
To provide an excess amount of air for easy starting
To enhance fuel pressure
To cool the engine during operation

The correct answer is: To provide an excess amount of air for easy starting

The main purpose of a hand-operated choke in gasoline engines is to restrict air intake when the engine is cold, thereby enriching the fuel mixture to aid in starting. When the choke is engaged, it creates a reduced airflow to the engine, which results in a higher concentration of fuel in the air-fuel mixture. This richer mixture is crucial for easier starting as it compensates for the lower vaporization of fuel at colder temperatures. By allowing less air into the engine, the choke ensures that there is enough fuel available for ignition. Once the engine is warmed up and operating more efficiently, the choke can be gradually disengaged to return to normal air-fuel mixture ratios for optimal engine performance.