Yes
You can use steel shot with a choke anywhere from cylinder to modified, i wouldn't recommend using steel with a improved modified or a full choke.
Yes- that is what the poly-choke is for.
They usually use a modified (medium) choke on the 870, unless it has choke tubes.
We would use a modified or full choke, and #4 shot.
If the car has fuel injection you cannot use a choke. however if the car has a carburetor without a automatic choke that is when add a manual choke cable to the carburetor choke flap. When you pull the choke flap closed it limits the air flow to the engine allowing for the engine to warm up so so it can atomize the fuel for the engine to run more efficiently. This is important in cold weather you almost always have to use a choke to start the engine.
No, only use the choke until the bike can idle without it
choke is used to lower the pressure from the well head
for close range use a modified it is a really versital choke but what i use for long range is a full i got 5 ducks with a full choke i know it ain't alot but i just started last year
The choke spreads fairly quickly and is use for upland hunting such as: quail, rabbits and close range game.
The choke you use depends on your target rather than the type of shotgun. For example: if you are shooting skeet, you would use improved or modified cylinder, but if you are shooting trap, you would use full choke.
They identify which chokes you have in without having to use a choke tool. different companies have different markings but in general the fewer marks, the more constricted the choke (1 mark=full choke).