SSC JE Electrical Engineering 2013
For the following questions answer them individually
A wattmeter is marked 15A/30A, 300V/600V and its scale is marked up to 4500 watts. When the meter is connected for 30A, 600A, the point indicated 2000 watts. The actual power in the circuit is
If the angular frequency of an alternating voltage is $$\omega$$, then the angular frequency of instantaneous real power absorbed in an ac circuit is
If the transistor having $$V_{CE} = 5 V, V_{BE} = 0.7$$ has $$\beta = 45$$, value of R is
In a balanced 3-phase circuit, the line current is 12 A. When the power is measured by two wattmeter method, one meter reads 11kW while the other reads zero. Power factor of the load is
If the supply polarity to the armature terminals of a separately excited DC motor is reversed, the motor will run under
