In some engines the lifter bore is offset in relation to the cam lobe. In others the cam lobes are tapered from side to side
So that they will rotate
Officially you should change lifters anytime you change the cam. In real world use; unless the roller lifters have obvious, visual damage, missing pins, wear on surface of the roller, then it is not normally going to be a problem. In the case of flat lifters, you should change them. The cam of flat tappet (regular) lifters, have a slight bevel to the surface of the cam. When the cam and lifter are in operation - this causes the lifters to rotate in their bore. After/during break-in, there is some wear on both surfaces and they end up with a pattern which is unique for each bore and and each cam/lifter combination. If you change either the order of the lifters on the original cam they meshed with, or install a new cam or new lifters - there is a very real chance of accelerated wear leading to failure of cam and lifter. What is worse - the resulting debris can follow the oil and ruin bearing surfaces throughout the engine. Your money, your choice.
Equipment in a generic Industrial plant setting which remain static and do not rotate during the course of operation are known as static equipment's.
365.25
rotate keep toward
Drives - I assume you are referring to Variable frequency Drives. The drives are useful when a motor needs to rotate at different speeds when in operation with out stopping it.
They sleep standing on one leg and rotate during the night.
Because of how the moon and the Earth rotate on their respective axis.
365 and 1/4 times
Depends on the car but most have timing notches on the cam and the crank and you will have to rotate them to the correct area so that the timing marks match up if you list the motor I might be able to explain better but many are like this.
Doesn't matter whether it's hot or cold. Bring #1 up to tdc and adjust 1,2,5,7 intakes and 1,3,4,8 exhausts. Rotate the engine one turn to put #6 at tdc then do the rest of the valves.
It's rotate!