The Prehistory of Jazz. The Africanization of American Music. An elderly black man sits astride a large cylindrical drum. Using his fingers and the edge of his hand, he jabs repeatedly at the drum head--which is around a foot in diameter and probably made from an animal skin--evoking a throbbing pulsation with rapid, sharp strokes.
nope, efficiency o fa machine cannot be greater than 100%...theoretically it shows sometime that efficiency of a machine can be 100%, but practically it cannot be possible as â¦ there is some loss of energy is always involved in different ways. Answer   In order for a machine to be 100% efficient, the amount of energy going into it has to be precisely equal to the energy the machine is putting out-with nothing lost.
It can be seen that at 50% load, the ferro voltage regulator efficiency ranges from 75 to 85%. As a comparison, a typical power transformer would have an efficiency of 90% or more at 50% load. In applications with high overload or inrush currents, it is common that the constant voltage transformer be oversized by 2 to 3 times the rated load current. This is to permit the ferro voltage regulator to pass enough current before the output voltage collapses as described above.