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99 views1 page

MI

Uploaded by

abhinavmkrishna2020
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DEPARTMENT OF ELECTRICAL ENGINEERING: COLLEGE OF ENGINEERING TRIVANDRUM. ‘THIRD SEMESTER B.TECH, DEGREE FIRST SERIES TEST ~ NOVEMBER 2022 ERT 203: Measurements and Instrumentation Max, Marks: 40. Answer all questions Part A J UC Explain the ess VY 1% Explain the different types of errors in a measurement system, SF Draw the circuit diagram of wattmeter used for measuring the power consumed by a highly inductive load. Mention the special features incorporated in the wattmeter for accurate measurement, we 6 Explain the loss of charge method for measurement of high resistance intials of indicating instruments. Part B e Explain the construction and working of Permanent Magnet Moving Coil (PYAMC) type instrament JA Show that defection is proportional to the eurent passing through the coil in PMMC instrument. OR a)Describe the concept of shunt and multipliers used to extend the range of DC meters, b) A moving coil instrument gives a full scale defection of 10 mA when the potential difference across its terminals is 100 mV. Calculate (a) the shunt resistance for a full scale deflection corresponding to 100 A, (b) the series resistance for full scale reading with 1000 V, Calculate the power dissipation in each case. J7- a) Explain the construction und working of electrodynamometer-type swaltmeter, V/_ ©) Dative the expression for average deflecting torque developed in the clectrodynamometer-type wattmeter oR we a) Explain three phase power measurement using two wattmeter method with phasor diagram. 'b) Power in a three phase balanced system is measured using two waltmeter adings of the wattmeters in the following cases: i) The load is 20kW at unity power luetor ii)The load is 20kW at O.8pf iii) The load. is 2UKW at 0.Spf iv)The loud is 20kW at 0.25pr Course Outeomes ‘COL Identify and analyse the factors alfesting pestomn sisting system CO2 Choose appropriate instruments For the measurement of voltage. eureent in we and de measurements 603. Faplain the operating principle of power snd energy measurement u Time: 2Hour Marks (3) BI BI BI m1 a7 7 co col col co3 co2 co2 co2 co2 coz co3 cO3 co3 K- Level KI KI K2 KI K2 © scanned with OKEN Scanner

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