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Electrical Engineering: Resistor and RLC Circuit Problems, Exams of Electrical Engineering
A series of electrical engineering problems related to resistors and rlc circuits. The problems involve finding voltage, current, power, energy, and impedance. Some problems use node analysis and superposition principle.
Typology: Exams
2012/2013
1 / 4
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9V
10V
FIGURE 3
Q7.
a) A coil of resistance 24 Ω and inductance 5.73mH is connected in series with a capacitance of 88.4μF across a 90V, 500Hz supply. Calculate the overall impedance and the supply current. [ 8 2 / 3 marks ]
b) In a series RLC circuit, R=0.5 Ω, L=12.7mH and C=8μF. Calculate the resonant frequency and the impedance at 500Hz. [ 8 marks ]
Q8.
a) A circuit of resistance 10Ω and inductance 76.4mH in series is connected to a 130V , 50Hz supply. Calculate the power factor. [ 6 2 / 3 marks ]
b) A 200-V, 50-Hz motor-pump set lifts 600 kg of water per minute through a height of 20m. If the overall efficiency of the set is 61.3%, and the current taken 20A, calculate
- the power factor of the motor
- the value of the parallel capacitance required to improve the power factor to unity. [ 10 marks ]