**EI 2202 – ELECTRICAL MEASUREMENTS**

**Model question paper**

**Part – A (10 * 2 - 20)**

**(Answer all the questions)**

**1. Classify the instruments based on their function.**

**2. Write the principle of moving coil instruments.**

**3. Define phantom loading.**

**4. Explain about watt meter and energy meter.**

**5. A 5 A , 230 V meter on full load unity power factor test makes 60 revolutions in 360 seconds. If the normal disc speed is 520 revolution per KWh, what is the percentage error?**

**6. What is the basic principle of Potentiometer? Mention its types.**

**7. Write the application of AC potentiometer.**

**8. Explain about Potential transformer and state the use of potential transformer.**

**9. Name the methods used for low resistance measurements.**

**10. How the resistance can be measures using direct deflection method.**

**Part B (16*5 – 80)**

**11. (i) Derive the Generalized Equation for A.C Bridges at Balance Condition.**

**(ii) Explain about**Maxwell Bridge and Wein’s Bridge.

**12.(a) (i) Explain briefly about D’ Arsonval Galvanometer with Torque Equation.**

**(ii) What are the Generalized Errors occurred in the Instruments, explain in**

**Detail**

**(or)**

**12.(b)Explain briefly about PMMC and PMMI instruments with Torque equation.**

**13.(a) What do you mean by wattmeter? Explain briefly about electrodynamometer**

**Type Wattmeter with toque equation.**

**(or)**

**(b) Explain briefly about wattmeter for a long period and derive the Torque**

**Equation for Energy Meter and mention what are errors occurred in the**

**Energy Meter.**

**14.(a) (i) what is meant by Potentiometer and standardization of Potentiometer.**

**(ii)Explain briefly about Laboratory type(DC) and mention its application.**

**(or)**

**14.(b)(i) what do you mean by Instrument Transformer.**

**(ii) Explain briefly about CT and PT with relevant Diagrams.**

**15.(a).(i) classify the resistance based on the range of the Measurement.**

**(ii) What are the methods can be used for the Measurement of Low resistance**

**and explain briefly about Kelvin bridge and**Kelvin Double Bridge with

**relevant diagram and equation.**

**(or)**

**15.(b)(i) What are the methods can be used for measurement of High resistance?**

**(ii) Explain briefly about Megger, Earth Resistance measurement &**

**Earth Tester**

**EI 2202 – ELECTRICAL MEASUREMENTS**

**Model question paper**

**E.I.E / I.I Year / I.I.I Semester Total Marks: 100**

**Part – A (10 * 2 - 20)**

**(Answer all the questions)**

**1. Write the principle of D’arsonval galvanometer.**

**2. What is meant by calibration? Why it is important.**

**3. What do you mean by LPF wattmeter?**

**4. The constant of a 230V , 50Hz single phase energy meter is having 185 revolutions per KWh. The meter takes 190 seconds for 10 revolutions while supplying a non inductive of 4.5 A at normal voltage. What is the percentage error of the instrument?**

**5. What do you mean by potentiometer? Mention its types.**

**6. Define standardization of potentiometer.**

**7. Write the application of CT and PT.**

**8. Classify the resistance based on the range of the measurement**

**9. Explain about price guard wire method for high resistance method.**

**10. What are the errors in the A.C bridges?**

**Part B (16*5 – 80)**

**11.(i) Derive the generalized equation for measuring the Impedance in the A.C bridge**

**Circuit at balance condition.**

**(ii) Explain about**Schering Bridge and Anderson Bridge .

**12. (i) What do you mean Galvanometer? Explain briefly about any one the**

**Galvanometer with Torque Equation.**

**(ii) Explain about Gross , Systematic and Random Errors.**

**(or)**

**12.(b) Explain briefly about Moving Coil and Moving ion Instruments with Torque**

**Equations.**

**13.(a) Explain Briefly about Induction type Energy Meter with Torque Equation and**

**mention what are errors occurred in the Energy Meter.**

**(or)**

**(b) (i) What is meant by Phantom Loading? Explain briefly about Phantom**

**Loading with testing of AC meter.**

**(ii) Explain about LPF wattmeter with relevant Diagram.**

**14. (a) Explain Briefly about Polar type and Coordinate type Potentiometer.**

**(or)**

**(b) Explain briefly about Current and Potential Transformer with relevant**

**Diagram.**

**15. (a) (i) Classify the resistance based on the range of measurement.**

**(ii) Explain about measurement of Medium Resistance by using Ammeter –**

**Voltmeter Method. Wheatstone Bridge Method.**

**(or)**

**(b) What are the methods can be used for measurement of Low Resistance and**

**Derive the Equation for measuring the Low resistance using**Thomson Bridge and

Thomson Double Bridge .

**EI 2202 – ELECTRICAL MEASUREMENTS**

**Model question paper**

**Part – A (10 * 2 - 20)**

**(Answer all the questions)**

**1. Write the principle of Moving iron Instruments.**

**2. Write the generalized errors occurred in the measuring instruments.**

**3. Explain about electrodynamometer type wattmeter.**

**4. A 5 A, 240 V meter on full load unity power factor test makes 50 revolutions in 350 seconds. If the normal disc speed is 580 revolutions per KWh, what is the percentage Error?**

**5. Write the principle of Current Transformer and Potential Transformer.**

**6. Classify the potentiometer and mention its applications.**

**7. Explain about Earth resistance measurements.**

**8. Define megger and mention its application.**

**9. Name the method used for medium resistance measurement.**

**10. Explain about vibration Galvanometer.**

**Part B (16*5 – 80)**

**11. (i) Derive the Generalized Equation for Measuring the capacitance and**

**Inductance in the Alternating Current bridge Circuit at balance condition.**

**(ii) Explain about**Campbell Bridge to measure mutual Inductance.

**(iii) write the errors in**A.C Bridge methods .

**12.(a) Explain in detail about Permanent Magnet Moving Coil Instruments and**

**Permanent Magnet Moving Iron Instruments with Torque Equation.**

**(or)**

**12. (a)(i) Explain briefly about D’Arsonval Galvanometer with Torque Equation.**

**(ii) What are the Generalized Error Occurred in Instruments Explain Briefly.**

**13.(a).(i) Explain Briefly about Energy Meter with Torque Equation.**

**(ii) Derive the Equation for D.C and A.C Power Measurement.**

**(or)**

**13.(b) (i) Derive the equation for A.C and D.C power Measurement.**

**(ii) Explain About Calibration of Wattmeter and Energy Meter with relevant Diagrams.**

**(iii) Explain about LPF Wattmeter with relevant Diagram.**

**14. (a) Explain in detail about Drysdale and Gall –Tinsley type Potentiometer.**

**(or)**

**14.(b) Explain in detail about Application of A.C and D.C Potentiometer with Neat Diagram.**

**15.(a) (i) What are the Methods can be used for Measuring the LOW , MEDIUM and**

**HIGH Resistance.**

**(ii) Explain in detail about Megger, Direct deflection Method, Earth**

**Resistance Measurement and Earth Tester.**

**(or)**

**15.(b) Derive the Equation for Wheatstone Bridge and**Kelvin Bridge and Kelvin

Double Bridge .