Question 286General Subjects - QMED

The correct answer is B) a stuffing box. A stuffing box is a mechanical seal used to prevent leakage of liquid around a shaft where it passes through a pump or other equipment. The stuffing box contains packing material that creates a tight seal around the rotating shaft, preventing the liquid from escaping at the shaft ends. This is the standard method for sealing the shaft ends of a helical gear pump to contain the liquid being pumped. The other answer choices are incorrect because: A) shaft end caps do not provide an adequate seal for a rotating shaft, C) the spaces between gear teeth are not designed to prevent liquid leakage, and D) a roller bearing alone does not create a sufficient seal to contain the liquid.