RRB/SSC JE Electrical 2019 || Measurements || Previous Year Questions

What is the number of wattmeters required to measure the power of a poly phase system containing ‘n; conductors?

What is the apparent power of a 3-phase star connected system having phase voltage of 254.05 V and line current of 10 A and the phase difference between the voltage and current is 45 degrees?

Which of the following is the dimension of power?

A factory runs ¡n 4 shifts of 6 hours each, in which it consumes 36kW, 86kW, 50kW and 20kW per hour in each shift respectively. Calculate the energy (in kWh) consumed by the factory per day.

What is the smallest change in the input signal that can be detected by an instrument called?