Question 25General Subjects - QMED

The correct answer is C) Compound gauge. A compound gauge is the most likely type of direct reading gauge used for measuring pump suction pressure. Compound gauges are capable of measuring both positive pressure and vacuum, which is essential for monitoring the suction side of a pump. The pump suction pressure can vary from positive pressure to vacuum, depending on the pump's operation, so a compound gauge is the appropriate choice to accurately measure this range. The other options are not as suitable - a differential pressure gauge measures the difference in pressure between two points, a vacuum gauge only measures negative pressure, and a standard pressure gauge can only measure positive pressure, which would not cover the full range of pump suction pressure readings.