Question

Which among the following methods are not standard laboratory viscometers?

(a) Saybolt Viscometer

(b) Redwood Viscometer

(c) Ostwald Viscometer

(d) Vibrational viscometer

I had been asked this question in an interview.

My enquiry is from Methods of Determination of Coefficient of Viscosity topic in chapter Viscous Flow & Turbulent Flow of Fluid Mechanics

Answer 1

Correct answer is (d) Vibrational viscometer

The best I can explain: Vibrational viscometer is a viscometer that serves the same purpose as the other viscometers. But, it is not used for laboratory purposes. It measures the damping oscillations using a resonator immersed in a fluid.