control and instrumentation lab 2.pptx
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A Maxwell bridge is used to measure an unknown low inductance value by comparing it to a calibrated variable capacitor. An audio oscillator supplies a 1 kHz signal to the bridge circuit, which contains the unknown inductance, calibrated resistances and capacitor. By adjusting the capacitor to minimize the sound in headphones connected to the bridge, the unknown inductance can be calculated using the formula L=PRC, where P and R are the calibrated resistances and C is the adjusted capacitor value. The Maxwell bridge allows measuring inductance independently of frequency and is suitable for medium quality coils with Q values between 1 and 10.
1 of 10
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![Tabulation
Model Calculation
S.No
.
Value of P (?)
Value of R
(?)
Value of
capacitance
(C)
Calculated
Value
Of L(H)
True value
(H) % Error
1.
1000 1000 0.151 151 150 -0.66%
C= (1*0.001)+(5*0.01)+(1*0.1)
= 0.151?F
L =PRC
= 1000*1000*0.151*10-6
=151mH
% ERROR = [(150-151) / 150 ] *100 = -0.66 %](https://image.slidesharecdn.com/controlandinstrumentationlab2-230801104833-fc88e477/85/control-and-instrumentation-lab-2-pptx-4-320.jpg)
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Lecture delivered in 2021. This gives an introduction to Natural Language Processing. It describes the use cases of NLP in daily life. It discusses the stages in NLP Pipeline. It highlights the challenges involved covering the different levels of ambiguity that could arise. It also gives a brief note on the present scenario with the latest language models, tools and frameworks/libraries for NLP.Machine Learning - Classification Algorithms
Machine Learning - Classification Algorithmsresming1
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This covers traditional machine learning algorithms for classification. It includes Support vector machines, decision trees, Naive Bayes classifier , neural networks, etc.
It also discusses about model evaluation and selection. It discusses ID3 and C4.5 algorithms. It also describes k-nearest neighbor classifer.Fundamentals of Digital Design_Class_21st May - Copy.pptx
Fundamentals of Digital Design_Class_21st May - Copy.pptxdrdebarshi1993
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Basics of Number Systems and Logic GatesAd
control and instrumentation lab 2.pptx
- 1. Ex. No 1 (b) Bridge Networks C AC Bridges Aim To measure the unknown value of low inductance using bridge network with built in 1 kHz oscillator and headphone. Apparatus Required S.No. Apparatus Required Quantity 1. Maxwell bridge kit. 1 No 2. Audio Oscillator 1 No 3. Head phone 1 No 4. Unknown value inductance 1 No 5. Connecting wires As Required
- 3. Description Maxwell¨s Inductance Bridge In this bridge an inductance is measured by comparison with a standard variable capacitance are as, Therefore, L = PRC ,P=1000,R=1000 P C Standard value of resistance in ohms R C Standard value of resistance in ohms C C Unknown value of capacitance in farads х100
- 4. Tabulation Model Calculation S.No . Value of P (?) Value of R (?) Value of capacitance (C) Calculated Value Of L(H) True value (H) % Error 1. 1000 1000 0.151 151 150 -0.66% C= (1*0.001)+(5*0.01)+(1*0.1) = 0.151?F L =PRC = 1000*1000*0.151*10-6 =151mH % ERROR = [(150-151) / 150 ] *100 = -0.66 %
- 5. Procedure 1.Connect the audio oscillator of 1 kHz of a variable output of about 0- 10 v to terminals are marked as oscillator. 2.A pair of sensitive headphone is connected to terminals marked headphone. 3.An unknown inductance of about 50mH to 500 mH is connected to terminals marked L. 4.Now switch on the oscillator and obtain for minimum sound in the headphones by varying R&C. 5.It may not be possible to obtain complete silence due to self capacitance of inductance coil and also due to presence of higher harmonics. 6.So null point may be hired by getting only minimum sound in the headphones. 7.Calculate the value of L by using the formula L=PRC.
- 6. Result Thus the value of the given unknown inductance by using Maxwell¨s inductance bridge method was measured.
- 10. A Maxwell bridge is a modification to a Wheatstone bridge used to measure an unknown inductance (usually of low Q value) in terms of calibrated resistance and inductance or resistance and capacitance. When the calibrated components are a parallel resistor and capacitor, the bridge is known as a Maxwell-Wien bridge The advantages of a Maxwell Bridge are: The frequency does not appear in the final expression of both equations, hence it is independent of frequency. Maxwell¨s inductor capacitance bridge is very useful for the wide range of measurement of inductor at audio frequencies The disadvantages of a Maxwell Bridge are: The variable standard capacitor is very expensive. The bridge is limited to measurement of low quality coils (1 < Q < 10) and it is also unsuitable for low value of Q (i.e. Q < 1) from this we conclude that a Maxwell bridge is used suitable only for medium Q coils.