03 Jun EXPLAIN THE WAT METER ERRORS IN BRIEF?
Q.16(A). The inductance of moving iron ammeter in micro henry is given by expression: L=20+5θ-2θ2 Where θ is deflection in radians from the zero position. Determine the angular in radians for a current of 10A if the for a current of 5A is 300.Also determine the spring constant.
Q.16(B).Derive the general torque equation for a MI instruments ?
Q.17(A).Explain the wat meter errors in brief?
Q.17(B).For a certain electrodynamometer ammeter the mutual inductance M varies with the deflection of θ as M=-6cos(θ+300)mH Find the deflecting torque produced by the direct current of 50mA corresponding to the deflection of 600.
Q.18(A). A 220V,10A dc energy meter is tested at its marked ratings. The resistance of pressure coil is 9900ohm and that of current coil is 0.5ohm .Calculate the power consumed when testing the meter with (i).Direct loading arrangements (ii).Phantom loading with current circuit excited by a 6V battery
Q.18(B). Draw the Maxwell’s bridge and give the balance equation.
Q.19.Power in a dc circuit is calculated as the product of current and voltage if the value of current and voltage are given by 6.3A and 110.2V and the uncertainities involved in their measurement being 0.06A and 0.1V .Calculate the power dissipated by the loads and the uncertainity involved in measurement.
Q.20(A).Explain the measurement of pressure using transducer.
Q.20(B).Explain the method use to measure high resistance.
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