SSC JE Electrical Engineering 2012
For the following questions answer them individually
An AC meter of resistance $$R_m$$ and resistance $$X_m$$ is connected in series with a resistance $$R_s$$. A shunt of impedance $$(R_{sh} + jX_{sh})$$ is applied in parallel to the existing combination of meter and $$R_s$$. The current division across the two branches will be independent of frequency when
In phantom loading arrangement, energy consumption in the calibration test of wattmeter is reduced because of
In the measurement of power in a balanced 3 - phase circuit bt two-wattmeter method if the two wattmeters show equal readings, then the power factor of the circuit is
Two meters X and Y required 40mA and 50mA respectively for fully scale deflection. Then
A Ballistic galvanometer of constant equal to 1 micro-coulomb/degree gives a throw of $$22.5^\circ$$, when a capacitor discharges through the meter. If a battery of 15V is used to recharge the capacitor, value of capacitance is
A potentiometer is used to measure the voltage between two points of a DC circuit, which is found to be 1.2V. This is also measured by a voltmeter, which is found to be 0.9V. The resistance of the volt meter is 60 kΩ. The input resistance between two points
A load is connected to supply. A current transformer (CT), and a potential transformer (PT) is used in between load and supply. A power factor of 0.5 is measured at the secondary side of CT and PT . If phase angle error of CT and PT are $$0.4^\circ$$ and $$0.7^\circ$$, power factor of the load is
