# Instrumentation Transducers Questions and Answers – Viscosity Measurement

This set of Instrumentation Transducers Multiple Choice Questions & Answers (MCQs) focuses on “Viscosity Measurement”.

1. Which of the following represents the slow motion of layers of fluid in one direction?
a) Laminar flow
b) Turbulent flow
c) Viscous flow
d) Both laminar and viscous flow

Explanation: If different layers of fluid moves slowly in a single direction, it is known as a laminar flow which can also be called as viscous flow.

2. If shear stress is equal proportional to velocity gradient, fluid is called as ______________
a) Newtonian fluid
b) Viscous fluid
c) Laminar fluid
d) None of the mentioned

Explanation: Newtonian fluids are in which shear stress is proportional to velocity gradient. Velocity gradient is the result of the approach of shear stress and is considered to be the rate of deformation.

3. Which of the following represents newton’s equation for viscosity?
a) τ = µ(dv/dt)
b) µ = τ(dv/dt)
c) τ = dv/dt
d) τ = µ2(dv/dt)

Explanation: Newton’s equation for viscosity connects relation of viscosity and velocity gradient.

4. Which of the following represents relation for kinematic viscosity?
a) Absolute density/mass density
b) Absolute density × mass density
c) Absolute density × (mass density)2
d) Absolute density/(mass density)2

Explanation: Kinematic density is the ratio of absolute viscosity and mass density denoted by ‘ϱ’.

5. Which of the following represents Newtonian fluids?
a) Lubricating oils
b) Honey
c) Rubber suspension
d) Synthetic oils

Explanation: Newtonian fluids are in which shear stress proportional to velocity gradient. Lubricating oils are Newtonian fluid, while all other options represent non-Newtonian fluids.

6. What happens to the viscosity of liquid and gas when the temperature is increased?
a) Both increases
b) Both decreases
c) For liquid increases and for gas decreases
d) For liquid decreases and gas increases

Explanation: As temperature is increased, viscosity of liquid decreases and for gases viscosity increases.

7. Orifice type viscometer covert viscosity to _______________
a) Force
b) Pressure
c) Displacement
d) Potential difference

Explanation: Orifice type device is used for measurement of viscosity in which viscosity is converted to pressure change.

8. Rotameter type viscometer converts viscosity to angular displacement.
a) True
b) False

Explanation: Rotameter type viscometers are used for measurement of viscosity and they are working based on the conversion of viscosity to torque.

9. Which of the following is not converting viscosity to pressure?
a) Redwood viscometer
b) Saybolt viscometer
c) Orifice viscometer
d) Rotameter viscometer

Explanation: Rotameter viscometer converts viscosity to torque, while all other options are different names of the same viscometer which convert viscosity to pressure.

10. Which of the following represents Hagen-poissule equation?
a) µ = (πd4ΔP)/(128Q’L)
b) µ = (d4ΔP)/(128Q’L)
c) µ = (πd4ΔP)/(Q’L)
d) µ = (πd4)/(128Q’L)

Explanation: Hagen-Piossule equation is applied in viscosity measurement using Saybolt viscometer.

Sanfoundry Global Education & Learning Series – Instrumentation Transducers.

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