Deck 25: Resistive-Inductive-Capacitive Parallel Circuits

Question 1

If a RLC parallel circuit contains more capacitive VARs than inductive VARs, the circuit has a power factor.

A) lagging
B) leading

Answer 1

B

Question 2

An RLC parallel circuit has an applied voltage of 208 volts. R = 42 Ω, XL = 52 Ω, and XC = 18 Ω. What is the inductive current?

A) 3.85 A
B) 3.92 A
C) 4.52 A
D) 4 A

Answer 2

D

Question 3

In an RLC parallel circuit, the is the same through all components and the are out of phase.

A) voltage; currents
B) current; voltages

Answer 3

A

Question 4

In a parallel LC circuit, the difference in frequencies above and below resonance at which impedance is 0.707 of the maximum is called the of the circuit.

A) bandwidth
B) bandpass
C) resonance
D) Q

Question 5

An RLC parallel circuit has an applied voltage of 240 V. R = 60 Ω, XL = 80 Ω, and XC = 40 Ω. What is the apparent power?

A) 300 VA
B) 1200 VA
C) 1400 VA
D) 1440 VA

Question 6

An RLC parallel circuit has an applied voltage of 240 volts. R = 60 Ω, XL = 100 Ω, and XC = 32 Ω. What is the resistive current?

A) 3.5 A
B) 4 A
C) 5.4 A
D) 6 A

Question 7

An RLC parallel circuit has an applied voltage of 240 V. R = 48 Ω, XL = 100 Ω, and XC = 36 Ω. What is angle theta?

A) 26.87°
B) 34.36°
C) 40.48°
D) 53.13°

Question 8

An RLC parallel circuit has an applied voltage of 240 volts. R = 60 Ω, XL = 20 Ω, and XC = 36 Ω. What is the capacitive current?
A) 3.27 A

A) 4 A
B) 5 A
D) 6.67 A

Question 9

A parallel tank circuit operating at its resonant frequency has an impedance of 10,000 Ω. At the points on either side of the resonant frequency that define the bandwidth, the impedance is approximately .

A) 6,000 Ω
B) 7,070 Ω
C) 10,140 Ω
D) 15,000 Ω

Question 10

An RLC series circuit has a 60-Hz, 120 V applied voltage. R = 50 Ω, XL = 137 Ω, and XC = 160 Ω. What is the inductance in the circuit?

A) 0.133 H
B) 0.261 H
C) 0.363 H
D) 0.424 H

Question 11

If a RLC parallel circuit contains more inductive VARs than capacitive VARs, the circuit has a power factor.

A) lagging
B) leading

Question 12

An RLC parallel circuit has an applied voltage of 277 volts. R = 82 Ω, XL = 50 Ω, and XC = 124 Ω. What is the true power?

A) 694.67 W
B) 753.58 W
C) 935.72 W
D) 1018.78 W

Question 13

For parallel resonant circuits, the correct formula relating ITANK, Q, and ILINE is _.

A) ITANK = Q / ILINE
B) ILINE = Q × ITANK
C) Q = ITANK / ILINE
D) ITANK = ILINE / Q

Question 14

An RLC parallel circuit has an applied voltage of 208 volts. R = 68 Ω, XL = 87 Ω, and XC = 81 Ω. What are the VARsC?

A) 436.24
B) 534.12
C) 697.29
D) 721.67

Question 15

A parallel circuit at resonance has ITANK = 1.00 A, ILINE = 0.05 A, Q = 20, and a voltage across the tank of 500 V. What is the impedance of the tank?

A) 10,000 Ω
B) 25,000 Ω
C) 50,000 Ω
D) 70,000 Ω

Question 16

An RLC parallel circuit has an applied voltage of 240 volts. R = 64 Ω, XL = 120 Ω, and XC = 180 Ω. What are the VARsL?

A) 480
B) 520
C) 900
D) 960

Question 17

An RLC parallel circuit has an applied voltage of 240 volts. R = 48 Ω, XL = 100 Ω, and XC = 36 Ω. What is the total current?

A) 6.57 A
B) 7 A
C) 8.4 A
D) 9.67 A

Question 18

An RLC series circuit has a 60-Hz, 120 V applied voltage. R = 75 Ω, XL = 100 Ω, and XC = 89 Ω. What is the circuit capacitance?

A) 16.53 μF
B) 25.37 μF
C) 29.80 μF
C) 909 μF

Question 19

An RLC parallel circuit has an applied voltage of 208 V. R = 68 Ω, XL = 87 Ω, and XC = 81 Ω. What is the power factor?

A) 0.004
B) 0.212
C) 0.277
D) 0.337

Question 20

An RLC parallel circuit has an applied voltage of 240 volts. R = 48 Ω, XL = 100 Ω, and XC = 36 Ω. What is the circuit impedance (Z)?

A) 17.06 Ω
B) 64.22 Ω
C) 80 Ω
D) 110.92 Ω

Question 21

To correct the power factor to 100 percent an equal amount of capacitive VARs would be connected in with the motor.

A) series
B) parallel

Question 22

If the power factor is corrected exactly so that the circuit is purely resistive, the power factor has a value of .

A) zero
B) 0.95
C) 50 percent
D) unity

Question 23

LC parallel circuits are often referred to as circuits.