Explain the relevant circuit diagram, the principle of measurement of low resistance by kelvin’s double bridge. Prove that the condition of balance is independent of the read resistance. Up to what low value it can be used?
28 June, 2022Explain the functional block diagram of CRO with neat diagram.
28 June, 2022What is lissajous pattern? Explain how phase & frequency can be measured using this figures.
28 June, 2022How that driving torque in a moving iron instrument is given by \(\theta = \frac{1}{2K}i^2\frac{\text{d}L}{\text{d}\theta}\) . Where the symbols have their usual meaning.
27 June, 2022In a certain current transformer, the following data is obtained. Nominal ratio = 25/5A, Turn ratio = 3, primary terns = 40, secondary turns = 120, secondary resistance = 0⋅16z, secondary reactance = 0⋅195Ω, secondary burden = 15 VA, Burden power factor = 0⋅7, secondary terminal voltage = 3V.
Find ratio & phase angle errors. The magnetising and loss ampere turns corresponding to an emf of 4⋅26V are13 & 10⋅1 respectively.
27 June, 2022Explain the principle of operation of a digital frequency meter.
27 June, 2022Explain how a low resistance is measured by a potentiometer
23 June, 2022
