How does the viscosity of a fluid being...

How does the viscosity of a fluid being...

Question 1 of 2921866636ef128f7522a1c523167

How does the viscosity of a fluid being pumped affect the operation of a spur gear pump?

Question 1 of 29218

Q

How does the viscosity of a fluid being pumped affect the operation of a spur gear pump?

🔍 Key Concepts

• Positive displacement pumps such as spur gear pumps and how they move fluid • Effect of increasing viscosity on required driving power, pump speed, and internal leakage (slip) • Practical limits of spur gear pumps for very low and very high viscosity fluids

💭 Think About

• Think about what happens inside the clearances between the gear teeth and casing when the fluid becomes thicker. Does leakage (slip) increase or decrease? • If a fluid is more viscous, what happens to friction and required torque at the same speed? How might operators compensate for that in practice? • Which options incorrectly say the pump is limited to only one narrow type of fluid, and which option describes an operating adjustment you would make as viscosity changes?

✅ Before You Answer

• Check which choice talks about changing operating conditions (like speed) rather than making an absolute statement about what the pump can or cannot handle. • Eliminate any option that says the pump “can only be used” with one specific viscosity range, since spur gear pumps are commonly used on a wide variety of fluids. • Verify from your machinery knowledge that higher viscosity increases friction and load, and think about how that affects the safe RPM of the pump.