Question 1

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?

Accepted Answer

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

Question 2

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?

Accepted Answer

A)  3.27 A 
B)  5 A 
C)  4 A 
D)  6.67 A 
A)  3.27 A 
B)  5 A 
C)  4 A 
D)  6.67 A D

Question 3

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

Accepted Answer

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

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.

Accepted Answer

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

Question 5

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)?

Accepted Answer

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

Question 6

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?

Accepted Answer

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

Question 7

LC parallel circuits are often referred to as circuits.

Accepted Answer

The answer of LC parallel circuits are often referred to...

Question 8

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

Accepted Answer

A)  lagging 
B)  leading 
A)  lagging 
B)  leading

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 .

Accepted Answer

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

Question 10

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?

Accepted Answer

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

Question 11

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?

Accepted Answer

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

Question 12

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?

Accepted Answer

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

Question 13

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

Accepted Answer

A)  voltage; currents 
B)  current; voltages 
A)  voltage; currents 
B)  current; voltages

Question 14

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

Accepted Answer

A)  series 
B)  parallel 
A)  series 
B)  parallel

Question 15

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

Accepted Answer

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

Question 16

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?

Accepted Answer

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

Question 17

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

Accepted Answer

A)  lagging 
B)  leading 
A)  lagging 
B)  leading

Question 18

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?

Accepted Answer

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

Question 19

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?

Accepted Answer

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

Question 20

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?

Accepted Answer

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

Exam 25: Resistive-Inductive-Capacitive Parallel Circuits

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?

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?

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

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.

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)?

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?

LC parallel circuits are often referred to as circuits.

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

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 .

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?

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?

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?

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

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

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

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?

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

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?

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?

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?

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