Question

Float type carburetors which are equipped with economizers are normally set for;

A) their richest mixture delivery and leaned by means of the economizer system.
B) the economizer system to supplement the main system supply at all engine speeds above idling.
C) economizer valves to be open at cruising speeds and closed at maximum RPM.
D) their leanest practical mixture delivery at cruising speeds and enriched by means of the economizer system at higher power settings.

Answer 1

Float type carburetors with economizers are set for the leanest mixture at cruising speeds and are enriched by the economizer system at higher power settings to optimize performance and fuel efficiency.

Step-by-step explanation:

Float type carburetors equipped with economizers are normally set for their leanest practical mixture delivery at cruising speeds. The role of the economizer system is to enrich the mixture under certain conditions to prevent the engine from running too lean when it needs more power, such as during acceleration or when operating at high power settings. The correct option is:
(D) their leanest practical mixture delivery at cruising speeds and enriched by means of the economizer system at higher power settings.

This system helps in optimizing the engine's performance and fuel efficiency. Under cruising conditions, the engine does not require the full amount of fuel that it may need under higher loads, so the mixture is kept lean to save fuel and reduce emissions.

When more power is needed and the throttle is opened wider, the economizer system activates to provide a richer mixture, ensuring that the engine has the necessary power without running too lean, which could cause engine damage.