NO
That depends on how the struts attach to the knuckle or control arm. On some front wheel drives an alignment is required.
Your tires are bad or you need an alignment. Get your tires checked, they may need to be replaced or rotated, and you can check your alignment by letting go of the steering wheel while driving, if it drifts left or right significantly, you need an alignment.
Check your wheel bearings, or you might need a wheel alignment
Yes
Yes
Yes, if your car has shock absorbers it would only be if they are broken in two pieces; if your car has struts then it is probably the upper mounts that are bad. If it is struts and you have the upper mounts replaced, you will also need an alignment.
Yes, wheel alignment machines do need to be calibrated.
Struts and shocks have a life span of 50k miles.If your struts have started to leak,they need to be changed as soon as possible.
Steering wheel shakes
Check for rusted brake parts, and also for partly seized bearing plates on the front struts, causing them to turn in a rough or jerky fashion. Sometimes the struts can be greased but often they need to be replaced.
No. If there had previously not been any alignment issues, and as long as the new tires are properly balanced, you will not need an alignment.
if you have independent suspention front and rear chances are a 4 wheel alignment can be done typically front wheel drive vehicles but not all.
If they are leaking, damaged, the car sits unlevel, or if after pushing down on the car the car bounces, they probably need replacing. Labor costs should be around $125 and the struts are about $100 each. A wheel alignment is recommended when replacing struts and runs about $60.