11. If in an alternating current circuit, capacitance C is connected to a supply of 200V,50Hz. The current in the circuit is 1.89 A. Find the capacitance C.
A. 30 µF
B. 20 µF
C. 10 µF
D. 15 µF
12. In an ac circuit, the resistance of 5 ohms is connected with a capacitor having capacitive reactance of 12 ohms. A supply of 260 V is connected to the circuit. Calculate the current in the circuit.
A. 40 A
B. 10 A
C. 20 A
D. 30 A
13. In an ac circuit, the resistance of 5 ohms is connected with a capacitor having capacitive reactance of 12 ohms. A supply of 260 V is connected to the circuit. Calculate the voltage across resistance.
A. 300 V
B. 200 V
C. 240 V
D. 100 V
14. In an ac circuit, resistance 5 ohm is connected with a capacitor having capacitive reactance 12 ohm. A supply of 260 V is connected to the circuit. Calculate the voltage across a capacitor.
A. 300 V
B. 200 V
C. 240 V
D. 100 V
15. Find the total voltage applied in a series RLC circuit when i = 3mA, VL = 30V, VC = 18V, and R = 1000 ohms.
A. 3.95V
B. 51V
C. 32.67V
D. 6.67V
16. In an RLC circuit, which of the following is always used as a vector reference?
A. Voltage
B. Resistance
C. Impedance
D. Current
17. In an RLC circuit, the power factor is always ____________
A. Positive
B. Negative
C. Depends on the circuit
D. Zero
18. In an RLC series phasor, we start drawing the phasor from which quantity?
A. Voltage
B. Resistance
C. Impedance
D. Current
19. What is the correct expression for the phase angle in an RLC series circuit?
A. φ = tan-1(XL-XC)/R
B. φ = tan-1 (XL+XC)/R
C. φ = tan(XL-XC)/R
D. φ = tan-1 (XL-XC)
20. When is tanφ positive?
A. When inductive reactance is less than the capacitive reactance
B. When inductive reactance is greater than the capacitive reactance
C. When inductive reactance is equal to capacitive reactance
D. When inductive reactance is zero