A device in which a chain reaction is initiated and controlled with the purpose of producing electrical power is called ?

You would do 1500/4 and the answer is 375

Sorry i dont understand the question can you rephase it?

Aseasonal prevailing wind in the region of south and southeast asia, blowing from the southwest between may and september and bringing rain (the wet monsoon ), or from the northeast between october and april (the dry monsoon ).

Not a  mixture of two common elements that can be separated by physical means.