Question: In a series L-C circuit fed by ac voltage, voltage drops across L and C are 40 V and 30 V respectively. The supply voltage is [A]. 70 V [B]. 10 V [C]. 50 V [D]. 1.333 V Answer:…

Question: A current 10 sin (200t) A flows through a 5 mH inductance. The expression for voltage is [A]. 10 sin (200t + 90°) [B]. 10 sin (200t – 90°) [C]. 10 sin(1000t + 90°) [D]. 10 sin (1000t –…

Question: In the circuit of figure [A]. Va would always lag Vb [B]. Va would always lead Vb [C]. Va and Vb can be in phase [D]. phase angle between Va and Vb would always be 90° Answer: Option B…

Question: For a series circuit of R and variable XL the admittance locus is [A]. a semicircle in first quadrant [B]. a semicircle in fourth quadrant [C]. a straight line in first quadrant [D]. a straight line in fourth quadrant…

Question: For a series circuit of variable R and XL, the impedance locus is [A]. a straight line parallel to X axis in first quadrant [B]. a straight line parallel to X axis in fourth quadrant [C]. a straight line…

Question: A variable resistance R and capacitive reactance XC are fed by an voltage. The current locus is [A]. a semi circle in 4th quadrant [B]. a semi circle in first quadrant [C]. a straight line in 4th quadrant [D].…

Question: A variable resistance R and capacitive reactance XC are connected in series. As R is varied, the locus of Z is [A]. a straight line parallel to Y axis in 4th quadrant [B]. a straight line parallel to X…

Question: In a series RLC circuit the phase angle θ of impedance Z ∠θ is positive. The circuit will behave as [A]. resistive circuit [B]. RC circuit [C]. RL circuit [D]. either RL or RC circuit Answer: Option B Explanation:…

Question: In figure the switch has been in position 1 for a long time. At t = 0, the switch is moved to position 2. The equation for transient current is [A]. [B]. [C]. [D]. Answer: Option C Explanation: When…