Loss of charge method 3. Thus in For high efficiency of transfer of power, internal resistance of the source should be? 3. Give one advantage and one limitation of V- I method. measured, ‘Rh’ is the regulating resistance and ‘G’ is an galvanometer. Its armature winding resistance. Now we switch is thrown to position ‘2’ and now ‘S’ is connected in a Medium Resistance ranges from 1Ω to 0.1 MΩ. , as it is not subject to the errors encountered in the latter method. The regulating resistance r is adjusted till the ammeter pointer is at a chosen scale mark. Explain any one of them. Resistance is classified into three categories for the sake of Measurement. 3.6 (a) the connection diagram for the substitution method for the measurement of medium resistance is shown. R is the unknown resistance to be measured, S is the standard variable resistance, ‘r’ is the regulating resistance and ‘A’ is an ammeter. we respect your privacy and take protecting it seriously, Voltmeter Ammeter Method for Measurement of Resistance, Over Current Relay and Its Characteristics, What is IGBT? 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. 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. 39 views. Measurement of Medium Resistance by Substitution Method March 27, 2016 by admin 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. what is mean by medium transmission line ? Let S, R and G be respectively the. the value of unknown resistance ‘Rt’ by substituting another standard variable 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. The connection diagram for Substitution Method is … State the range for low and medium resistance. For measurement of mutual inductance we can use? Radiation, on the other hand, can go through empty space. what is equivalent resistance when four 4 Ohm resistors are connected in i) series ii) parallel, A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. 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. Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as? For measurement of radio frequency ac signals __________ type meter is used, The bridge most suited for accurate measurement of relative permittivity of dielectric materials is. 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. Give classification of level measurement methods with two examples of each. 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. (i) With standard resistor, 41 divisions. The connection diagram for the substitution method is shown in fig. The connection diagram for Substitution Method is given below. With a neat diagram explain medium head hydro-electric power plants. Draw and explain bulk correction method for power factor & control. Why MOSFET is used for low power applications? The accuracy of 0.1% is quite common with a Wheatstone bridge as opposed to accuracies of 3% to 5% with the ordinary ohmmeter for measurement of medium resistances. Different categories of Resistance is measured by different technique. Learn how your comment data is processed. 5. 0 votes . Commentdocument.getElementById("comment").setAttribute( "id", "ab259ec877f815571ebff9bee7edec6c" );document.getElementById("be07d35803").setAttribute( "id", "comment" ); Subscribe to our mailing list and get interesting stuff and updates to your email inbox. ElectrodynamometerInstruments Construction and Operation, Kelvin Double Bridge Method for Low Resistance Measurement, Transfer Function of Armature Controlled DC Motor, Steam Power Plant - Working Principle & Schematic Diagram, Three Phase Induction Motor Construction & Working Principle. Write one advantage and one disadvantage each for spring control method and gravity control method. Now the variable Resistor S is adjusted till the reading of Ammeter is same as when R was in the circuit. When we put the Switch at position 2 then R is connected to the circuit. The accuracy of the measurement naturally depends upon the constancy of the battery emf and of the. Wheatstone bridge method 4. The connection diagram for Substitution Method is shown in fig.1. (R >100 KΩ), List of different methods for Medium resistance Measurement's are :-. What is need of level measurement? Let say a1 is the deflection of Galvanometer when standard Resistor S is in circuit and a2 when unknown Resistance R is in circuit. List one advantage and one disadvantage of one wattmeter method. All Rights Reserved by Electrical Engineering Info. Different categories of Resistance are measured by the different techniques. Name the method used to measure following resistances:- (i) Low resistance (ii) Medium resistance (iii) Insulation resistance (iv) Earth resistance. 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. Ammeter resistance must be zero and voltmeter resistance must be infinity for perfectly accurate measurement which is not possible. State Magneto-striction. While calculating performance of medium transmission line, what assumptions are made in case of (i) Nominal 'T' Method (ii) Nominal 'TT' Method. What is the difference between a line voltage and low voltage control system? Carey- Foster Bridge Method 5. Email me at this address if my answer is selected or commented on: Email me if my answer is selected or commented on. List the different level measurement methods. Accurate measurement of very low resistances is possible with. There With neat diagram explain calibration of energy meter by direct loading method. Explain V- I method of measurement of medium resistance. Torque in indicating Instrument (Deflecting, Controlling, Damping), Voltmeter Ammeter Method for Measurement of Resistance. Explain spring control method with neat diagram. For measurement of inductance having high value, we should use? Firstly when switch is at position 1 and ‘Rt’ is connected in a -Working & Types of UPS Explained. 2. Measurement of Medium Resistance by Substitution Method Substitution Method for measuring Medium Resistance: The connection diagram for substitution method is shown in figure below. Write one advantage and one disadvantage each for spring control method and gravity control method. Here, R is the unknown Resistance, S the Standard variable Resistance, A is Ammeter and r is Regulating Resistance. Now the Switch is thrown to position 2 putting the Standard variable Resistance S in the circuit. (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. The Regulating Resistance r is adjusted till the reading of Ammeter is at a chosen scale mark. In this method, use suitable source, ammeter and voltmeter and connect them as shown in the above diagram. With a neat diagram explain medium head hydro-electric power plants. Welcome to AskOrAnswerMe.com , where you can ask questions and receive answers from other user. Digital/analog multi-meter method. In Substitution Method, the Resistance whose value is to be measured is compared with the Standard Resistance. i) By replacing lamp sources ii) Using light control gears. 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. Disadvantages-Low value of resistance can’t be measured because it becomes negligible. Explain V- I method of measurement of medium resistance. Direct deflection method 2. What is considered low voltage and high voltage? order to avoid errors on this account, New batteries operate (should operate) at a So, a1/a2 = (R+G)/(S+G) where G is Galvanometer resistance. State precautions while laying of underground cable in the situation : (i) Minimum clearance between cable and water pipe line when running in parallel. Following are the methods employed for measuring a resistance whose value is in the range 1Ω – 100kΩ – 1. 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. Which of the following is the least expensive protection for over current in low voltage system? Define measurement and state the significance of electrical measurement system. In this section, we will learn about Measurement of Medium Resistance by Substitution Method. is a switch for putting S and Rh in a circuit. Explain significance and purpose of electrical measurement system. Medium Resistance: This category includes Resistance from 1Ω to 0.1 MΩ. A parallel RLC circuit has the node equation Determine v(t) using the phasor method. Give method of compensation for each. Substitution Method 4. Describe the following energy conservation methods of electrical motor. State the range for low and medium resistance. However, the accuracy of this method is greatly affected if there is any change in the Battery EMF during the time when the reading in two settings is taken. Which method of braking is generally used in elevators ? State any two disadvantages of one wattmeter method of measurement of 3 phase power. State how pressure measurement can be done using Dead weight tester. Regenerative method of braking is based on that? List different starting methods of three phase synchronous motor. (iv) When more than one cable is to be laid in the same trench, what should be minimum spacing between two cables ? Get all latest content delivered straight to your inbox. In an AC. Instruments for test are easily available.

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