When is the choke used in the engine?

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This question is part of a full practice quiz:
Automobile Engineering Practice Test: Petrol Engine Fuel System — practice the complete quiz, review flashcards, or try a random question.

A petrol engine's fuel system consists of several components that work together to transfer fuel from the tank to the engine for combustion.

The main components of the fuel system are: 
Fuel tank, Fuel pump, Fuel filter, Fuel injectors, Fuel pressure regulator, Carburetor, Fuel lines, Air cleaner, Inlet manifold, Supply and return pipelines. 
 


When is the choke used in the engine?