SSC JE Electrical Engineering 2013
For the following questions answer them individually
In a motor starter, the electromechanical contactor provides inherent protection against
In the circuit, V is the input voltage applied across the capacitor of 2 F. Current through the capacitor is
A geyser is operated from 230V, 50 c/s mains. The frequency of instantaneous power consumed by the geyser is
Two lossy capacitors with equal capacitance values and power factors of 0.01 and 0.02 are in parallel, and the combination is supplied from a sinusoidal voltage source. The power factor of the combination is
A voltmeter when connected across aDC supply, reads 124 V. When a series combination of the voltmeter and an unknown resistance X is connected across the supply , the meter reads 4V. If the resistance of the voltmeter is 50kΩ , the value of X is
In a 3-phase 400 V, 4-wire system, two incandescent lamps, one having 230 V, 100 W specification and the other 230 V, 200 W are connected between R phase-neutral and Y phase-neutral respectively. If the neutral wire breaks
A solenoid of inductance 250 mH and resistance 10 Ω is connected to a battery. The time taken for the magnetic energy to reach $$\frac{1}{4}th$$ of its maximum
value is
