Final answer:
A temperature of 170°F (77°C) is too high for standard industrial hydraulic systems, which usually operate between 120°F to 140°F (49°C to 60°C), making the answer 'false'.
Step-by-step explanation:
Regarding the normal operating temperature of a hydraulic reservoir, a temperature of 170°F (77°C) is generally too high for standard industrial hydraulic systems. Most hydraulic systems operate at temperatures between 120°F and 140°F (49°C to 60°C). Operating at a temperature of 170°F (77°C) can reduce the life of the hydraulic oil, lead to the degradation of seals and hoses, and increase the risk of system failure. Therefore, the answer to the question is B - false as 170°F (77°C) is not typically considered a normal or recommended hydraulic reservoir temperature.