Question 703Steam Plants - Assistant Engineer

The correct answer is D) to produce a nearly equal magnitude of centrifugal force. The reason is that the centrifugal force generated in a centrifuge is directly proportional to the square of the rotational speed. Therefore, to achieve a similar magnitude of centrifugal force in a tubular bowl centrifuge (with a smaller diameter) compared to a disk-type centrifuge, the rotational speed of the tubular bowl must be more than twice that of the disk-type centrifuge. The other options are incorrect because they do not directly address the need to generate an equal magnitude of centrifugal force. Option A and B relate to factors affecting friction and windage, which are secondary considerations. Option C about the use of a drag bushing is not the primary reason for the higher rotational speed.