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Test: Measurement of Pressure, pH & Viscosity- 1


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25 Questions MCQ Test Sensor & Industrial Instrumentation | Test: Measurement of Pressure, pH & Viscosity- 1

Test: Measurement of Pressure, pH & Viscosity- 1 for GATE 2022 is part of Sensor & Industrial Instrumentation preparation. The Test: Measurement of Pressure, pH & Viscosity- 1 questions and answers have been prepared according to the GATE exam syllabus.The Test: Measurement of Pressure, pH & Viscosity- 1 MCQs are made for GATE 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Measurement of Pressure, pH & Viscosity- 1 below.
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Test: Measurement of Pressure, pH & Viscosity- 1 - Question 1

If the displacement is measured with strain gauge then the number of strain gauge normally required are

Detailed Solution for Test: Measurement of Pressure, pH & Viscosity- 1 - Question 1 If displacement is measured with a strain gauge then four strain gauge are required.
Test: Measurement of Pressure, pH & Viscosity- 1 - Question 2

A capacitive pressure sensor has a typical measurement uncertainty of

Detailed Solution for Test: Measurement of Pressure, pH & Viscosity- 1 - Question 2 Capacitive pressure sensors measure pressure by detecting changes in electrical capacitance caused by the movement of a diaphragm.
Test: Measurement of Pressure, pH & Viscosity- 1 - Question 3

The instruments used for the measurement of pressure is/are

Detailed Solution for Test: Measurement of Pressure, pH & Viscosity- 1 - Question 3 Pressure measurement is the analysis of an applied force by a fluid, whether a liquid or a gas, on a surface. Pressure is basically measured in the units of force per unit of the surface. Instruments used to measure and display pressure in an integral unit are called pressure meters or pressure gauges or vacuum gauges.
Test: Measurement of Pressure, pH & Viscosity- 1 - Question 4

Bourdon tube is used for the measurement of gauge pressure of

Detailed Solution for Test: Measurement of Pressure, pH & Viscosity- 1 - Question 4 The Bourdon-tube gauge, invented about 1850, is still one of the most widely used instruments for measuring the pressure of liquids and gases of all kinds, including steam, water, and air up to pressures of 100,000 pounds per square inch (70,000 newtons per square cm).
Test: Measurement of Pressure, pH & Viscosity- 1 - Question 5

Dead weight gauge is used for the measurement of pressure of

Detailed Solution for Test: Measurement of Pressure, pH & Viscosity- 1 - Question 5 Dead weight gauge is used for the measurement of pressure of about 7000 bar. A dead weight tester is an instrument that calibrates pressure by determining the weight of force divided by the area the force is applied. The formula for dead weight testers is pressure equals force divided by the area where force is applied.
Test: Measurement of Pressure, pH & Viscosity- 1 - Question 6

The ionization gauge an instrument used for the measurement of

Detailed Solution for Test: Measurement of Pressure, pH & Viscosity- 1 - Question 6 The ionization gauge is a special type of instrument used for measuring very low pressures in the range 10−10 to 1 mbar.
Test: Measurement of Pressure, pH & Viscosity- 1 - Question 7

When a visual indication of pressure level is required then the instrument generally used is

Detailed Solution for Test: Measurement of Pressure, pH & Viscosity- 1 - Question 7 Monometer - Visual indication of pressure level.
Test: Measurement of Pressure, pH & Viscosity- 1 - Question 8

For the measurement of high pressure with high accuracy the device used is

Detailed Solution for Test: Measurement of Pressure, pH & Viscosity- 1 - Question 8 Manganin wire is the most suitable measurement device for high-pressure liquids. It has high stability and durability on a long-term basis.
Test: Measurement of Pressure, pH & Viscosity- 1 - Question 9

Advantage of passive instrument is

Detailed Solution for Test: Measurement of Pressure, pH & Viscosity- 1 - Question 9 Medium Range - One of the primary reasons passive tags have such a short read range is because they need to be close to a reader to power on. The power-on range is much shorter than the reflected communication range.
Test: Measurement of Pressure, pH & Viscosity- 1 - Question 10

In McLeod gauge,

Detailed Solution for Test: Measurement of Pressure, pH & Viscosity- 1 - Question 10 A McLeod gauge is a scientific instrument used to measure very low pressures, down to 10−6 Torr (1.33 mPa). It was invented in 1874 by Herbert McLeod (1841–1923). McLeod gauges were once commonly found attached to equipment that operates under vacuum, such as a lyophilizer.
Test: Measurement of Pressure, pH & Viscosity- 1 - Question 11

In a stationary fluid, how do the local pressure of the fluid vary?

Detailed Solution for Test: Measurement of Pressure, pH & Viscosity- 1 - Question 11 According to Pascal’s law, the local pressure of a fluid is same in all directions. Hence, the pressure won’t vary along the x and y-direction. The local pressure will increase with an increase in depth due to the extra weight of water column above that point.
Test: Measurement of Pressure, pH & Viscosity- 1 - Question 12

Which of the following cannot be the value of absolute pressure of a fluid at any point?

Detailed Solution for Test: Measurement of Pressure, pH & Viscosity- 1 - Question 12 Absolute zero pressure is the reference used for the measurement of absolute pressure. Absolute zero pressure is possible (theoretically). Hence, 0 and positive values are possible, but a negative value is impossible.
Test: Measurement of Pressure, pH & Viscosity- 1 - Question 13

A student wants to find the absolute pressure of water at a point below the surface of water. He has a barometer and a manometer pressure gauge. The barometer reads 1.3152 bar whereas the manometer pressure gauge reads 0.3152 bar. What is the absolute pressure? (Assume that pressure at one end of the manometer is atmospheric.)

Detailed Solution for Test: Measurement of Pressure, pH & Viscosity- 1 - Question 13 The options may tempt you to subtract the readings, but the concept of barometer and manometer is important. Barometer measures the atmospheric pressure whereas, the manometer reads the gauge pressure. Hence, we need to add the two values.
Test: Measurement of Pressure, pH & Viscosity- 1 - Question 14

In a U-tube manometer, one end is open to the atmosphere, the other end attached to a pressurized gas of gauge pressure 40 kPa. The height of the fluid column in the atmospheric side is 60 cm, and that on the gas side is 30 cm. The manometic fluid used is: (Take g = 9.8 m/s2).

Detailed Solution for Test: Measurement of Pressure, pH & Viscosity- 1 - Question 14 Gauge pressure = 40000 Pa. Height difference = 60 – 30 = 30 cm = 0.3 m. ρ*g*(h2 – h1) = 40000. We get, ρ = 13605 kg/m3 = Density of mercury.
Test: Measurement of Pressure, pH & Viscosity- 1 - Question 15

In a U-tube mercury manometer, one end is exposed to the atmosphere and the other end is connected to a pressurized gas. The gauge pressure of the gas is found to be 40 kPa. Now, we change the manometric fluid to water. The height difference changes by: (ρmercury = 13600 kg/m3, ρwater = 1000 kg/m3).

Detailed Solution for Test: Measurement of Pressure, pH & Viscosity- 1 - Question 15 Since the gauge pressure remains the same ρ*(h2 – h1) = constant. The height difference in mercury manometer is 0.30 m and that in a water manometer is 4.08 m. Percent change is thus, 1260%. Be careful about the denominator used for computing percent change.
Test: Measurement of Pressure, pH & Viscosity- 1 - Question 16

A manometric liquid should suitably have _________.

Detailed Solution for Test: Measurement of Pressure, pH & Viscosity- 1 - Question 16 A high density is favourable because the height of the column required for the manometer would below. A liquid with high vapour pressure would be less sensitive to changes in pressure and may result in a slower rise of the manometric fluid. Thus, a fluid with low vapour pressure is favourable.
Test: Measurement of Pressure, pH & Viscosity- 1 - Question 17

A simple U-tube manometer can measure negative gauge pressures.

Detailed Solution for Test: Measurement of Pressure, pH & Viscosity- 1 - Question 17 The height of the manometric fluid in a U-tube manometer in the test column would fall if there is positive gauge pressure. The height would increase if there is negative gauge pressure. It is possible to measure negative gauge pressures with a U-tube manometer. However, the negative pressure cannot fall below -1 Bar.
Test: Measurement of Pressure, pH & Viscosity- 1 - Question 18

Both ends of a U-tube manometer are exposed to the atmosphere. There exists a possibility that the height difference of the manometer is non-zero. True or False?

Detailed Solution for Test: Measurement of Pressure, pH & Viscosity- 1 - Question 18 The height difference may be non-zero when there are multiple immiscible fluids used in the same manometer. Even though the pressure is same on both surfaces, the height would be different as the fluid with higher density will be at a lower height.
Test: Measurement of Pressure, pH & Viscosity- 1 - Question 19

The below figure shows an inclined U-tube mercury manometer. The vertical end of the tube is exposed to a gas of gauge pressure 50 kPa and the inclined end is exposed to the atmosphere. The inclined part of the tube is at an angle of 30o with the horizontal. Find the value of h (in cm) (take g = 9.8 m/s2, ρmercury = 13600 kg/m3)

Detailed Solution for Test: Measurement of Pressure, pH & Viscosity- 1 - Question 19 Pressure along the dotted line will be 50 kPa. Gauge pressure in an inclined manometer is given by P = ρ.g.h.sin (Ɵ). Substituting P, ρ and Ɵ, we get the value of h as 0.75 m.
Test: Measurement of Pressure, pH & Viscosity- 1 - Question 20

In the manometer given above, 2 immiscible fluids mercury (ρ = 13600 kg/m3) and water (ρ = 1000 kg/m3) are used as manometric fluids. The water end is exposed to the atmosphere (100 kPa) and the mercury end is exposed to a gas. At this position, the interface between the fluids is at the bottom-most point of the manometer. Ignore the width of the manometer tube and the radius of curvature. The value of h is found to be 9.45 m. The height of the mercury column is given to be 75 cm. Find the gauge pressure of the gas. (g = 9.8 m/s2)

Detailed Solution for Test: Measurement of Pressure, pH & Viscosity- 1 - Question 20 Height of water column = 0.75 + 9.45 = 10.2 m. We equate the pressures at the bottom most point. Pa + ρw.g.(10.2) = Pg + ρm.g.(0.75). We find, Pg = 100 kPa = Absolute pressure. Hence, gauge pressure will be 0.
Test: Measurement of Pressure, pH & Viscosity- 1 - Question 21

What value of angle Φ is between the plate and cone in Cone-and-Plate viscometer?

Detailed Solution for Test: Measurement of Pressure, pH & Viscosity- 1 - Question 21 The angle Φ between the plate and cone is very small, usually less than 3°, and the fluid to be measured is located in this small gap. Large cone angles are not used for routine work for a variety of reasons, the most important being that analysis of the results for non-Newtonian fluids would be complex or impossible.
Test: Measurement of Pressure, pH & Viscosity- 1 - Question 22

A small spherical ball of diameter 5mm is thrown into a well of water and it moves with a terminal velocity 10cm/s. Calculate the density of the spherical ball. Given that viscosity of water is 0.01poise.

Detailed Solution for Test: Measurement of Pressure, pH & Viscosity- 1 - Question 22 According to Stoke’s theorem,

Test: Measurement of Pressure, pH & Viscosity- 1 - Question 23

Which one of the following is not applicable to rotating spindle viscometer?

Detailed Solution for Test: Measurement of Pressure, pH & Viscosity- 1 - Question 23 Penicillium chrysogenum has a Shear rate (s-1) of 1-15 and is a Casson plastic and applicable under Turbine impeller.
Test: Measurement of Pressure, pH & Viscosity- 1 - Question 24

Which one of the following is not applicable to Coaxial cylinder?

Detailed Solution for Test: Measurement of Pressure, pH & Viscosity- 1 - Question 24 Xanthomonas campestris has a Shear rate (s-1) of 0.0035-100 and is a pseudoplastic, K increases continually; n levels off when xanthan concentration reaches 0.5%; cell mass (max 0.6%) has relatively little effect on viscosity.
Test: Measurement of Pressure, pH & Viscosity- 1 - Question 25

Oil flows in a pipe 100 mm bore diameter with a Reynolds’ Number of 500. The density is 800 kg/m3. Calculate the velocity of a streamline at a radius of 40 mm. The viscosity µ = 0.08 Ns/m2.

Detailed Solution for Test: Measurement of Pressure, pH & Viscosity- 1 - Question 25

Since Re is less than 2000 flow is laminar so Poiseuille’s equation applie

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