Power in AC Circuits and Power Factor

JEE Main Physics · Alternating Current · 14 questions, latest first

• A LCR series circuit driven with E_r m s=90 V at frequency f_d=30 Hz has resistance R=80 Ω, an inductance with inductive…20266 April, Shift 1 · Q45
• An inductor of 10 mH, capacitor of 0.1 μ F and a resistor of 100 Ω are connected in series across an a.c power supply 220 V, 70…20264 April, Shift 1 · Q50
• For the series L C R circuit connected with 220 V, 50 Hz a.c source as shown in the figure, the power factor is (α)/10. The value…202624 January, Shift 1 · Q37
• An inductor of reactance 100 Ω, a capacitor of reactance 50 Ω, and a resistor of resistance 50 Ω are connected in series with an…20257 April, Shift 2 · Q48
• A capacitor of reactance 4 √3 Ω and a resistor of resistance 4 Ω are connected in series with an ac source of peak value 8 √2 V.…20249 April, Shift 2 · Q53
• When a d c voltage of 100 V is applied to an inductor, a d c current of 5 A flows through it. When an a c voltage of 200 V peak…20246 April, Shift 1 · Q55
• An AC voltage V=20 sin 200 π t is applied to a series LCR circuit which drives a current I=10 sin (200 π t+(π)/3). The average…202431 January, Shift 2 · Q43
• A series L.R circuit connected with an ac source E=(25 sin 1000 t) V has a power factor of 1/(√2). If the source of emf is…202430 January, Shift 1 · Q43
• In an a.c. circuit, voltage and current are given by: V=100 sin (100 t) V and I=100 sin (100 t+(π)/3) mA respectively. The…202429 January, Shift 2 · Q43
• A series LCR circuit with L=100/(π) mH, C=(10^-3)/(π) F and R=10 Ω, is connected across an ac source of 220 V, 50 Hz supply. The…202427 January, Shift 2 · Q58
• Given below are two statements: Statement I: An AC circuit undergoes electrical resonance if it contains either a capacitor or an…202313 April, Shift 2 · Q44
• Given below are two statements: Statement I: Maximum power is dissipated in a circuit containing an inductor, a capacitor and a…202310 April, Shift 1 · Q45
• In a series L R circuit with X_L=R, power factor is P_1. If a capacitor of capacitance C with X_C=X_L is added to the circuit the…202330 January, Shift 1 · Q14
• A series LCR circuit is connected to an AC source of 220 V, 50 Hz. The circuit contains a resistance R=80 Ω, an inductor of…202325 January, Shift 2 · Q23