A condenser brushing forms arm AB of a Schering bridge and a standard capacitor of 500 pF and negligible loss forms arm AD. Arm BC consists a non-inductive resistance of 300 ohm, When the bridge is balanced, arm CD has resistance of 72.6 ohm in parallel with a capacitance of . The supply frequency is 50 Hz. Calculate the unknown capacitance.

In order to prevent creeping in an energy meter, which of the following measures is adopted?

Which of the following testing methods is NOT used to test an AC energy meter?

When is the error under testing of energy meter directly obtained?

How does the power factor affect the reading of a wattmeter if voltage and current are unaltered?

A moving iron ammeter with a range of 0 to 1 amps has an internal resistance of 50 mΩ and an inductance of 0.1 MH. To increase the range to 0-10 Ampere for all operational frequencies, a shunt coil is connected. The shunt coils resistance in mΩ and time constant in milliseconds are each given as:

A Lissajous patterns on a Cathode Ray Oscilloscope (CRO) has 8 vertical maximum values and 4 horizontal maximum values. The frequency of the horizontal input is 1600 Hz. Determine the frequency of the vertical input?