a) Describe briefly the Mole's arrangement for measuring high dissipation factors in the low frequency range. b) A 33 kV, 50 Hz high voltage Schering bridge is used to test a sample of insulation. The various arms have the following parameters on balance: the standard capacitance 500 pF, the reactive branch 800 and branch with parallel combination of resistance and capacitance has values 180 and 0.15 uF. Determine the viability of the insulator. c) Figure Q3(c) shows the discharge curves of a 0.1 F, 100 V standard condenser. It is used to measure the resistivity of an insulator by loss of charge method. It is found that the steady state charging current is 3.85 x 10-8A. Confirm the resistivity of that insulator with DC resistivity method. 1000 500 30 t (minutes)