When the engine is cold.
Yes
Yes
Yes
Taurus
Choke is used generally in cold weather to prime the engine generally in carborated engine in hot weather choke is not needed however in newer fuel injections the choke is all electric and has no user control
gag
luner roving veichle
donkey
donkey
choke is used before drives to reduce the source supply fluctuation problem , which will effect drives
About 2,500 BCE.
choke is used to lower the pressure from the well head