SSC JE Electrical Engineering 27th Jan 2018 Shift-1
For the following questions answer them individually
Which one of the following is the main cause of magnetic decay in PMMC type instrument?
Determine the quality factor in Hay's bridge given below, if the bridge is supplied by a frequency of 50 Hz.
Determine the apparent power (in W) of a circuit, if the circuit have a power factor of 0.8 and the reactive power of the circuit is 60 W.
A building has 3 floors and each floor has 4 fans of 50 W that operates for 12 hours a day and one air conditioner of 3000 W that operates for 2 hours per day in the month of the June. Determine the energy consumption (in kWh) of the building in June.
Determine the reading (in kW) of both the wattmeters used to measure the power of a three-phase three-wire system having input of 6 kW and power factor of 1.
What will be the secondary voltage (in V) of a potential transformer, if the value of system voltage is 11,000 V, the turn’s ratio of the potential transformer is 108 and the percentage voltage error of the transformer is 5%?
Determine the full-scale reading (in V) of a PMMC type voltmeter, when the internal resistance of the voltmeter is 230 kilo-ohms, the series resistance connected with the voltmeter is 70 kilo-ohms and the sensitivity of the voltmeter is 3 kilo-ohms/volt.
