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<h1>Economizer Device in Carburetors – UPRVNL JE 2016 Question</h1>Carburetors are used in older petrol engines to mix the air-fuel ratio for combustion. Some carburetors are equipped with an economizer device for special operating conditions. Let’s look at a previous year JE exam question from UPRVNL JE 2016.<hr data-start="399" data-end="402"><h3 data-start="404" data-end="421">Question:</h3><h5>In some carburetors, the economizer device is used for:</h5><h5>(a) Cold starting / कोल्ड स्टार्टिंग के लिए 
(b) Idling / आइडलिंग के लिए 
(c) Acceleration / एक्सीलरेशन के लिए 
(d) Power enrichment / शक्ति संवर्धन के लिए</h5><hr data-start="647" data-end="650"><h3 data-start="652" data-end="677">Video Solution</h3>I’ve explained this concept with diagrams showing fuel flow in different carburetor circuits in my video.<h4><a data-start="790" data-end="820" class="" rel="noopener" href="#">Watch Full Video Solution</a></h4><hr data-start="823" data-end="826"><h3 data-start="828" data-end="851">Correct Answer:</h3>(d) Power enrichment / शक्ति संवर्धन के लिए<hr data-start="903" data-end="906"><h3 data-start="908" data-end="928">Explanation:</h3>The economizer device in a carburetor is used to provide an extra-rich fuel mixture during high load or full-throttle conditions.Why?<ul data-start="1083" data-end="1298">
<li data-start="1083" data-end="1136">
Under heavy load, the engine requires more power.
</li>
<li data-start="1137" data-end="1210">
A richer air-fuel ratio improves combustion and prevents overheating.
</li>
<li data-start="1211" data-end="1298">
The economizer bypasses the main jet restriction, supplying more fuel to the venturi.
</li>
</ul><hr data-start="1300" data-end="1303"><h3 data-start="1305" data-end="1331">Working Principle:</h3><ul data-start="1332" data-end="1482">
<li data-start="1332" data-end="1402">
During normal running → The main jet supplies the correct mixture.
</li>
<li data-start="1403" data-end="1482">
During high load → The economizer valve opens, allowing extra fuel to flow.
</li>
</ul><hr data-start="1484" data-end="1487"><h3 data-start="1489" data-end="1518">Key Points for Exams:</h3><ul data-start="1519" data-end="1726">
<li data-start="1519" data-end="1557">
Cold starting → Choke is used.
</li>
<li data-start="1558" data-end="1596">
Idling → Idle circuit is used.
</li>
<li data-start="1597" data-end="1645">
Acceleration → Accelerator pump is used.
</li>
<li data-start="1646" data-end="1726">
High load / full throttle → Economizer is used for power enrichment.
</li>
</ul><hr data-start="1728" data-end="1731">

Tip: If the question has “economizer” in a carburetor, think “extra fuel during high load = power enrichment.”

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