International Day Of The World’s Indigenous Peoples 2023: Date, theme, Significance and History– Every year on August 9, the United Nations (UN) observes International Day of the World’s Indigenous People to promote and safeguard the rights of the world’s Indigenous population. Also known as World Tribal Day, this event also recognises the achievements and contributions […]
Quit India Movement: Introduction The Quit India Movement was a watershed moment in India’s independence movement from British colonial domination. The 81st anniversary of this historic event that transformed the course of Indian history will be celebrated in 2023. As we commemorate this significant milestone, it is essential to reflect the ideals and sacrifices of
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Q. A single-phase fully-controlled thyristor converter is used to obtain an average voltage of 180 V with 10 A constant current to feed a DC load. It is fed from single-phase AC supply of 230 V, 50 Hz. Neglect the source impedance. The power factor (round off to two decimal places) of AC mains is
Q. A fully-controlled three-phase bridge converter is working from a 415 V, 50 Hz AC supply. It is supplying constant current of 100 A at 400 V to a DC load. Assume large inductive smoothing and neglect overlap. The rms value of the AC line current in amperes (round off to two decimal places) is
Q. In a DC-DC boost converter, the duty ratio is controlled to regulate the output voltage at 48 V. The input DC voltage is 24 V. The output power is 120 W. The switching frequency is 50 kHz. Assume ideal components and a very large output filter capacitor. The converter operates at the boundary between
Q. In a 132 kV system, the series inductance up to the point of circuit breaker location is 50 mH. The shunt capacitance at the circuit breaker terminal is 0.05 µF. The critical value of resistance in ohms required to be connected across the circuit breaker contacts which will give no transient oscillation is Solution:
Q. A 30 kV, 50 Hz, 50 MVA generator has the positive, negative, and zero sequence reactances of 0.25 pu, 0.15 pu, and 0.05 pu, respectively. The neutral of the generator is grounded with a reactance so that the fault current for a bolted LG fault and that of a bolted three-phase fault at the
Q. A three-phase 50 Hz, 400 kV transmission line is 300 km long. The line inductance is 1 mH/km per phase, and the capacitance is 0.01 µF/km per phase. The line is under open circuit condition at the receiving end and energized with 400 kV at the sending end, the receiving end line voltage in
Q. A 220 V (line), three-phase, Y-connected, synchronous motor has a synchronous impedance of (0.25 + 𝑗2.5) Ω/phase. The motor draws the rated current of 10 A at 0.8 pf leading. The rms value of line-to-line internal voltage in volts (round off to two decimal places) is Solution:
Q. A delta-connected, 3.7 kW, 400 V(line), three-phase, 4-pole, 50-Hz squirrel-cage induction motor has the following equivalent circuit parameters per phase referred to the stator: 𝑅1 = 5.39 Ω, 𝑅2 = 5.72 Ω, 𝑋1 = 𝑋2 = 8.22 Ω. Neglect shunt branch in the equivalent circuit. The starting line current in amperes (round off to
