# EI6301 Electrical Measurements Nov Dec 2016 Important Questions

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B.E/B.TECH DEGREE EXAMINATION NOV / DEC 2016
Third Semester
Department of EIE
EI6301 Electrical Measurements
Nov Dec 2016 Important Questions
(Regulation 2013)

16 Marks Important Questions asked in previous years university examinations.

1. Define the principle of operation of Ballistic Galvanometer and explain with neat diagram.
2. Tabulate the features of PMMC, MI and Dynamometer type of instruments
3. Explain the different types of Rectifier circuits and obtain the voltage equation for each type
4. Explain the operation of Dynamometer type ammeter with torque equation
5. A 220V 5A DC energy meter is tested at its marked ratings. The resistance of the pressure circuit is 8800Ω and that of current coil is 0.1 Ω. Calculate the power consumed in when testing the meter with (i) Direct loading arrangements (ii) Phantom loading with current circuit excited by a 6V battery
6. Explain the Procedure of Calibration of wattmeter
7. Describe phantom loading testing of energy meter. Illustrate how phasor diagram can be drawn in three phase circuits
8. List the different types of errors occurring in wattmeter and write short notes on it.
9. Explain the use of instrument transformer for the measurement of power with a neat diagram
10. List the functions of transfer instrument and phase shifting transformer
11. List the different types of ratios present in instrument transformers and write how it is calculated
12. An AC potentiometer is used for the determination of impedance of a coil and the following results are obtained. The voltage across a 1 ohm resistor in series with a coil is 0.245 – j 0.092 V. The voltage across a 10:1 potential divider used with the coil is 0.3021 + j 0.246 V. Analyze the above data and assume proper values to calculate the resistance and reactance of the coil
13. Explain the disadvantages of using shunts and multipliers while measuring high values of current and voltages.
14. Describe the method of construction and operation of C.T and P.T
15. Describe the construction and working of shunt type ohmmeter
16. Explain the Loss of charge method for Measurement of insulation resistance of cables
17. Draw the circuit of a Wheat stone bridge and deduce the conditions for balance. List the sources of measurement errors in Wheatstone bridge
18. Describe the substitution method of measurement of medium resistances. List the factors on which the accuracy of the method depends
19. What are the different sources of errors in AC bridges? Explain the precautions taken and the techniques used for elimination of these errors
20. The four arms of an AC bridge contain the following elements: PQ, a coil of unknown impedance; QR, a non-inductive resistor of 1000Ω; RS, a noninductive resistor of 85 Ω in series with a standard capacitor of 0.35 μF; SP, a pure resistor of 16,500 Ω. The supply frequency is connected to points P and R, and a detector to point Q and S. Separate and identify the inductance and resistance values of the coil.
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