Therefore to avoid the error because of change of EMF of Battery, a Battery of enough capacity is used so that it remains constant during the entire period of testing. Name the method used to measure following resistances:- (i) Low resistance (ii) Medium resistance (iii) Insulation resistance (iv) Earth resistance. Explain two different methods in brief. The Regulating Resistance r is adjusted till the reading of Ammeter is at a chosen scale mark. Since the substitution of one resistance for another has left current unaltered, and provided that EMF of battery and position of Regulating Resistance r remain unaltered, the two Resistance R and S must be equal. List the different level measurement methods. Ohmmeter Method The different methods used for the measurement of Medium resistance are as follows: In this section, we will learn about Measurement of Medium Resistance by Substitution Method. Accurate measurement of very low resistances is possible with. Explain V- I method of measurement of medium resistance. Give one advantage and one limitation of V- I method. Thus in Explain energy conservation method in lighting system by using installation of separate transformer / servo stabilizer. The accuracy of this method is may greatly S Privacy: Your email address will only be used for sending these notifications. Ammeter resistance must be zero and voltmeter resistance must be infinity for perfectly accurate measurement which is not possible. Ammeter voltmeter method 2. Following are the methods employed for measuring a resistance whose value is in the range 1Ω – 100kΩ – 1. Write one advantage and one disadvantage each for spring control method and gravity control method. Substitution method. Feel free to ask any question. , as it is not subject to the errors encountered in the latter method. asked Sep 6, 2018 by anonymous. Describe the following energy conservation methods of electrical motor. capacity of 100 percent. State how pressure measurement can be done using Dead weight tester. Which of the following is the least expensive protection for over current in low voltage system? So that we can measure deflection is obtained as in the ‘Rt’ obtained. Now the variable Resistor S is adjusted till the reading of Ammeter is same as when R was in the circuit. Draw and explain bulk correction method for power factor & control. Welcome to AskOrAnswerMe.com , where you can ask questions and receive answers from other user. Explain significance and purpose of electrical measurement system. There The setting of dial of S is read. Measurement of a non -electrical quantity involves the following four subsystems: The bridge most suited for accurate measurement of relative permittivity of dielectric materials is, Accurate measurement of very low resistances is possible with. (iv) When more than one cable is to be laid in the same trench, what should be minimum spacing between two cables ? Give one advantage and one limitation of V- I method. Name two methods for measurement of low, medium and high resistance. The regulating resistance r is adjusted till the ammeter pointer is at a chosen scale mark. The accuracy of this method also depend on resistance of circuit excluding R and S, upon the sensitivity of instrument and upon the accuracy with which the Standard Resistance S is known. Thus the value of unknown Resistance R is equal to the dial setting of Standard Resistance S. This method of measurement is more accurate as compared to the Ammeter Voltmeter Method as in this method measurement is not affected by the accuracy of Ammeter. Now the Switch is thrown to position 2 putting the Standard variable Resistance S in the circuit. Identify the correct combination of respective Electric arc welding and Electric resistance welding methods : While calculating performance of medium transmission line, what assumptions are made in case of (i) Nominal 'T' Method (ii) Nominal 'TT' Method. For measuring a very high resistance we should use? (adsbygoogle = window.adsbygoogle || []).push({}); Substitution Method for measuring Medium Resistance: The switch is put at position 'I' and resistance R is connected in the circuit. Get all latest content delivered straight to your inbox. They are classified as Low Resistance: Resistance having value 1Ω or below are kept under this category. Firstly when switch is at position 1 and ‘Rt’ is connected in a Email me at this address if my answer is selected or commented on: Email me if my answer is selected or commented on. obtained it means same amount of current flow in both the resistances (‘S’ A low utilization factor for a plant indicates that? State the four methods of laying of cable. Thus the value of unknown Resistance R is equal to the dial setting of Standard Resistance S. This method of measurement is more accurate as compared to the Ammeter Voltmeter Method as in this method measurement is not affected by the accuracy of Ammeter. The different methods used for the measurement of, Measurement of Low, Medium & High Resistance, Ammeter Shunt | Construction & Calculation, Resistance Temperature Detector (RTD) or Resistance Thermometers, Voltmeter–Ammeter Method for Measuring Medium Resistances, Measurement of Thermal Conductivity | Gas Analyzer, Microphones | Measurement of Sound | Applications, Hygrometer | Measurement of Humidity | Applications, Single Cage & Double Cage Induction Motors, Electrical Safety: 10 Tips to Prevent Workplace Electrical Injuries, 8 Ways A Commercial Electrician Can Help Your Business Succeed, 9 Ways to Keep Safe from Electrical Hazards, Differential Amplifier | Working & Applications, Dredging Corporation of India Limited Recruitment 2020, Voltage Follower | Applications & Advantages, Summing Amplifier or Op-amp Adder | Applications, Current to Voltage Converter | Applications, Voltage to Current Converter | Applications, Op-amp Differentiator Circuit & Applications. Describe with working of LCR meter for measurement of inductance. In this figure, R is the unknown resistance while S is the standard variable resistance “A” is an ammeter and Rh is a regulating resistance In order to connect R & S into the circuit alternatively there is a switch. Resistance is classified into three categories for the sake of Measurement. Define measurement and state the significance of electrical measurement system. Therefore this method is called Substitution method. State precautions while laying of underground cable in the situation : (i) Minimum clearance between cable and water pipe line when running in parallel. Draw Bourdon tube with LVDT setup for pressure measurement. In Substitution Method, the Resistance whose value is to be measured is compared with the Standard Resistance by some technique which is described in this section. The Substitution Method is however very important as it finds its use in the application of bridge method and in high accuracy A.C. measurement. State two applications of : (i) PVC paper (ii) Porcelain with type of class based on withstand temperature is insulating material. Here, R is the unknown Resistance, S the Standard variable Resistance, A is Ammeter and r is Regulating Resistance. 39 views. Carry- foster method Methods for measurement of high resistance: 1. 3.6 (a) the connection diagram for the substitution method for the measurement of medium resistance is shown. Regenerative method of braking is based on that? State Magneto-striction. Medium Resistance ranges from 1Ω to 0.1 MΩ. Substitution Method 4. Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as? content: "\f160"; While calculating performance of medium transmission line, what assumptions are made in case of (i) Nominal 'T' Method (ii) Nominal 'TT' Method. A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. (i) With standard resistor, 41 divisions. Email me at this address if my answer is selected or commented on: Email me if my answer is selected or commented on. List different starting methods of three phase synchronous motor. the value of unknown resistance ‘Rt’ by substituting another standard variable Remove the resistance S, check the value S. This resistance value of S is similar to equal to the value of R. Advantages-This method is simpler. A website for electrical engineering education on Machines,Circuits,Power Systems,Measurements,Control Systems,Power Electronics. below. Draw Hysteresis loop for : (i) High silicon steel (ii) Copper (iii) Soft iron (iv) Wood.

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