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Test: Measurement of Viscosity - GATE MCQ


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10 Questions MCQ Test - Test: Measurement of Viscosity

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Test: Measurement of Viscosity - Question 1
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Two parallel plates separated by 1.45 cm are filled with a liquid with a viscosity of 3.6 × 10−2 Pa·s. What is the force acting on 1m2 of the plate, if the other plate is given a velocity of 2.3 m/s?

Detailed Solution for Test: Measurement of Viscosity - Question 1

The force (F) resisting motion in a Newtonian fluid is given by

where A is the boundary area being moved, V is the velocity of the moving boundaries, y is the distance between boundaries, and μ is the coefficient of viscosity or dynamic viscosity. The units of measurement must be consistent.

Putting values, we’ve

F = (3.6 x 1 x 2.3 x 100)/(100 x 1.45) = 5.71 N

Test: Measurement of Viscosity - Question 2
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In a falling-ball viscometer, the ball attains terminal velocities of 0.01 m/s for oil A and 0.002 m/s for oil B. Assuming the oils have the same density and oil A has a kinematic viscosity of 5 x 10– 3 m2/s, the kinematic viscosity of oil B in m2/s is

Detailed Solution for Test: Measurement of Viscosity - Question 2
Applying Stokes formulae, we get the desired result.

Here ball obtain terminal velocity because of force applied by liquid due to viscous drag which is given by formulae

F = 6 πρ nv

so, kinematic viscosity = 25 × 10– 3m2/s

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Test: Measurement of Viscosity - Question 3
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A viscous damper consists of a sliding piston and a cylinder filled with the oil of kinematic viscosity 5 × 10– 5 m2/s. A damping force of 20 N is applied on the piston and the steady-state velocity reached is 10 mm/s. The damping coefficient of the damper is

Detailed Solution for Test: Measurement of Viscosity - Question 3

F =  

where η  = damping co-efficient

20 N = η × 10 mm/s

or  = 2 Ns/mm

Test: Measurement of Viscosity - Question 4
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A capillary viscometer, with known dimensions, is used for measuring dynamic viscosity of the oil. In order to obtain viscosity, it is necessary and sufficient if one measure
Detailed Solution for Test: Measurement of Viscosity - Question 4
From, Hagin-Poisuille equal to laminar flow

The unknown are p and Q and applicable only for Laminar flow.

Test: Measurement of Viscosity - Question 5
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Which of the following represents the slow-motion of layers of fluid in one direction?
Detailed Solution for Test: Measurement of Viscosity - Question 5
If different layers of fluid move slowly in a single direction, it is known as a laminar flow which can also be called as viscous flow.
Test: Measurement of Viscosity - Question 6
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If shear stress is equally proportional to velocity gradient, fluid is called as
Detailed Solution for Test: Measurement of Viscosity - Question 6
Newtonian fluids are in which shear stress is proportional to velocity gradient. The velocity gradient is the result of the approach of shear stress and is considered to be the rate of deformation.
Test: Measurement of Viscosity - Question 7
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Which of the following represents relation for kinematic viscosity?
Detailed Solution for Test: Measurement of Viscosity - Question 7
Kinematic density is the ratio of absolute viscosity and mass density.
Test: Measurement of Viscosity - Question 8
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What happens to the viscosity of liquid and gas when the temperature is increased?
Detailed Solution for Test: Measurement of Viscosity - Question 8
As the temperature is increased, the viscosity of liquid decreases and for gases viscosity increases.
Test: Measurement of Viscosity - Question 9
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Orifice type viscometer convert viscosity to
Detailed Solution for Test: Measurement of Viscosity - Question 9
The orifice type device is used for measurement of viscosity in which viscosity is converted to pressure change.
Test: Measurement of Viscosity - Question 10
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Which of the following is not converting viscosity to pressure?
Detailed Solution for Test: Measurement of Viscosity - Question 10
Rotameter viscometer converts viscosity to torque, while all other options are different names of the same viscometer which converts viscosity to pressure.
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