# measurement of medium resistance

So, a1/a2 = (R+G)/(S+G) where G is Galvanometer resistance. All Rights Reserved by Electrical Engineering Info. What is the advantage of high power factor? 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. When the same deflection 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. Limitation and application of High Voltage DC (HVDC). The three methods of heat transfer are:* Conduction * Convection * Radiation The first two require a medium. The setting of the dial of S is read. Write one advantage and one disadvantage each for spring control method and gravity control method. This method is not widely used for simple Resistance measurement and is used in modified form for the measurement of High Resistance. & ‘Rt’). capacity of 100 percent. Which of the following is the name given to resistance of thin films that are uniform in thickness? Welcome to AskOrAnswerMe.com , where you can ask questions and receive answers from other user. List any two methods of reactive power measurement in 3 phase circuit. -Working & Types of UPS Explained. should be used so that the emf remains constant. Let say a1 is the deflection of Galvanometer when standard Resistor S is in circuit and a2 when unknown Resistance R is in circuit. In Substitution Method, the Resistance whose value is to be measured is compared with the Standard Resistance. /*color: #02CA02;*/ Wheatstone Bridge Method 3. 1. circuit, a low value of kVAR compared with kW indicates? Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as? In this section, we will learn about Measurement of Medium Resistance by Substitution Method. Solution: As the deflection of Galvanometer is directly proportional to the current flowing through the circuit which in turn depends on the net resistance in the circuit. Therefore this method is called Substitution method. The value of standard variable resistance ‘S’ is varied till the same Now we switch is thrown to position ‘2’ and now ‘S’ is connected in a Please note that the highest resistance scale is only limited to 2k or 2 kilo-ohm resistance. 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 different starting methods of three phase synchronous motor. Name two methods for measurement of low, medium and high resistance. 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. #wpadminbar #wp-admin-bar-wccp_free_top_button .ab-icon:before { Now the variable Resistor S is adjusted till the reading of Ammeter is same as when R was in the circuit. Substitution Method for Medium Resistance Measurement, Resistance is classified into basically three categories for the Measurement. The figure below shows the basic circuit of a Wheatstone bridge. For high efficiency of transfer of power, internal resistance of the source should be? R is the unknown resistance while S is a standard variable resistance. Now, the switch is thrown to position '2' putting the standard variable. Describe the following energy conservation methods of electrical motor. 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. 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. Ohmmeter Method For this reason, very high degrees of accuracy can be achieved using a Wheatstone bridge. For measuring a very high resistance we should use? For measurement of radio frequency ac signals __________ type meter is used. circuit. the value of unknown resistance ‘Rt’ by substituting another standard variable The regulating resistance ‘Rh’ is adjusted till. Help everyone by giving best answer to the questions. Thus in order to avoid errors on this account, a battery of ample capacity should be used so that its emf remains constant. 1. different types of errors occurs in measurement. Explain two different methods in brief. (R >100 KΩ) (R >100 KΩ) List of different methods for Medium resistance Measurement's are :- Privacy: Your email address will only be used for sending these notifications. Medium Resistance ranges from 1Ω to 0.1 MΩ. Disadvantages-Low value of resistance can’t be measured because it becomes negligible. When we put the Switch at position 2 then R is connected to the circuit. 2. content: "\f160"; 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. resistance ‘S’. Accurate measurement of very low resistances is possible with. deflection is obtained as in the ‘Rt’ obtained. How are nuclear reactors controlled? 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. High Resistance:- Resistance of the order of 100 KΩ and above is classified as High resistance. State the different methods of Power Generation adopted in India. Loss of charge method 3. Name two methods for measurement of low, medium and high resistance. Its armature winding resistance. Its armature winding resistance. Methods for measurement of medium resistance: 1. The main disadvantage of the Ward-Leonard control method is? They are classified as Low Resistance: Resistance having value 1Ω or below are kept under this category. For measurement of inductance having high value, we should use? The accuracy of this method is may greatly Example: In measurement of Resistance by Substitution Method, a standard 0.5 MOhm resistor is used. Explain V- I method of measurement of medium resistance. Explain any one of them. Ammeter-Voltmeter Method 2. 39 views. With a neat diagram explain medium head hydro-electric power plants. Explain V- I method of measurement of medium resistance. A website for electrical engineering education on Machines,Circuits,Power Systems,Measurements,Control Systems,Power Electronics. Welcome to AskOrAnswerMe.com , where you can ask questions and receive answers from other user. The Regulating Resistance r is adjusted till the reading of Ammeter is at a chosen scale mark. A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. A parallel RLC circuit has the node equation Determine v(t) using the phasor method. State the range for low and medium resistance. Feel free to ask any question. obtained it means same amount of current flow in both the resistances (‘S’ While calculating performance of medium transmission line, what assumptions are made in case of (i) Nominal 'T' Method (ii) Nominal 'TT' Method. Feel free to ask any question. State Magneto-striction. (R >100 KΩ), List of different methods for Medium resistance Measurement's are :-. Resistance is classified into three categories as low, medium and high resistance. Step-down transformer converts high voltage and low current into: For measurement of inductance having high value, we should use? Thus in Name the method used to measure following resistances:- (i) Low resistance (ii) Medium resistance (iii) Insulation resistance (iv) Earth resistance. The deflection of the galvanometer is directly proportional to the current passing through the circuit and hence is inversely proportional to the total resistance of the circuit. The accuracy of the measurement naturally depends upon the constancy of the battery emf and of the.

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