2023 Exam Questions
Q. What is the average value of alternating current over a complete cycle?
Q. An alternating voltage given by e = 140 sin (314.2 t) is connected across a pure resistor of 50 Ω.
Calculate:
i) the frequency of the source
ii) the r.m.s. current through the resistor
Q. A 100 Ω resistor is connected to a 220 V, 50 Hz supply.
Calculate:
i) r.m.s. value of current and
ii) net power consumed over the full cycle
2022 Exam Questions
Q. The average value of alternating current over a full cycle is always _____.
(I0 = Peak value of current)
(A) zero
(B) \frac{I_0}2
(C) \frac{I_0}{\sqrt2}
(D) 2 I0
Q. Define:
i) Inductive reactance
ii) Capacitive reactance
iii) Impedance
Q. A 0.1 H inductor, a 25 x 10-6 F capacitor and a 15 Ω resistor are connected in series to a 120 V, 50 Hz AC source. Calculate the resonant frequency.
Q. A 1000 mH inductor, 36 μF capacitor and 12 Ω resistor are connected in series to 120 V, 50 Hz AC source. Calculate:
i) impedance of the circuit at resonance
ii) current at resonance
iii) resonant frequency
