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Posted Date: 30 Jan 2020      Posted By:: Shouvik Maj    Member Level: Silver  Points: 3 (₹ 2)

2019 Jadavpur University B.E Electrical Engineering Electrical Measurements and Measuring Instruments (2nd Year 1st Semester)-2019 Question paper

Course: B.E Electrical Engineering   University/board: Jadavpur University

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B.E Electrical Engineering 2nd year, 1st Semester - 2019
Electrical Measurements and Measuring Instruments

Total Time - 3 Hours
Full Marks - 100


Classification of electrical measuring instruments, general feature of indicating
instruments: controlling, damping, balancing. Galvanometer: dynamics, sensitivity,
D'Arsonval galvanometer, Ballistic galvanometer, Vibration Galvanometer, PMMC
instrument, temperature compensation, rectifier type instrument, Moving iron instrument,
errors and compensations, electrodynamometer type instrument, extension of
instrument range: - shunt, multiplier, Capacitive voltage divider power measurement for
DC ,single and three phase AC circuit low power factor wattmeter, wattmeter
connections and errors, Induction type energy meter: characteristics, errors and their
compensation, current transformer(C.T.) , potential transformer (P.T.); testing and
calibration of measuring instruments.
Measurement of medium resistance using Wheatstone bridge , Series and Shunt type
ohmmeter .Measurement of high resistance using Megohm bridge and Megger
.Measurement of phase / power factor using electrodynamometer type and moving
iron type instrument. Measurement of frequency using electrical resonance type and
ratio type instrument. Kelvin double bridge, measurement of surface resistivity.
Measurement of inductances and capacitances, measurement of incremental
inductances, interbridge transformer, residuals, errors in bridges, detectors, DC
potentiometer: Weston normal cell, Vernier type, Kelvin-Verley slide, dual range,
applications, phantom loading, AC potentiometer:- polar type and co-ordinate type, Use
of Ballistic Galvanometer in magnetic testing, ac magnetic testing: Lloyd-fisher square,
transducers: RTD, thermistor, thermocouple, laws of thermocouple circuits, cold junction
compensation, strain gauge.


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