An AC generator delivers an effective (RMS) current of 80 A to a 25 ohm load. Wh

Question

An AC generator delivers an effective (RMS) current of 80 A to a 25 ohm load. What is the peak power? 120 kW 160 kW 240 kW 320 kW Why tap changer provided in HV windings of the transformer? T HV side current value is less as compared to LV side Insulation requirement is less All of the above None of the above A transformer has a primary voltage rating of 120 volts and a secondary voltage rating of 24 volts. If the voltmeter connected across the secondary indicates 144 V, what is the type of polarity of the transformer? Subtractive polarity Additive polarity Cannot be determined None of the above A coil with an air core has a resistance of 14.7 ohm. When it is connected to a 42 V, 60 Hz ac source, it draws a current of 1.24 A. Calculate the Impedance of the coil, the reactance of the coil, its inductance, phase angle between the voltage and current. 120 kW 33.87 ohm, 30.5 ohm, 80 mH, 60.3 240 kW 320 kW

Explanation / Answer

Question 13:

Power, P = I2*R = 802*25 = 160 kW

Second Option is Correct.

Question 14:

None of the above

Option Four is Correct

Question 16:

33.87 ohm, 30.5 ohm, 80 mH, 60.3o

Second Option is Correct.

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