Question 1

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 2

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 C

Question 3

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 A

Question 4

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 5

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?

Accepted Answer

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

Question 6

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

Question 7

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

Question 8

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 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 208 volts. R = 42 Ω , XL = 52 Ω , and XC = 18 Ω . What is the inductive current?

Accepted Answer

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

Question 11

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?

Accepted Answer

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

Question 12

LC parallel circuits are often referred to as _______________ circuits.

Accepted Answer

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

Question 13

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 μ F 
B)  25.37 μ F 
C)  29.80 μ F 
D)  909 μ F 
A)  16.53 μ F 
B)  25.37 μ F 
C)  29.80 μ F 
D)  909 μ F

Question 14

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 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

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 17

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

Question 18

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 19

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 20

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 °

Exam 25: Resistive-Inductive-Capacitive Parallel Circuits

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

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?

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

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 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?

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?

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 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 208 volts. R = 42 Ω , XL = 52 Ω , and XC = 18 Ω . What is the inductive current?

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?

LC parallel circuits are often referred to as _______________ circuits.

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?

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.

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

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

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?

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

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?

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?

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For parallel resonant circuits, the correct formula relating I_TANK, Q, and I_LINE is _____.

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

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

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

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

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

An RLC parallel circuit has an applied voltage of 240 volts. R = 60 Ω , X_L = 20 Ω , and X_C = 36 Ω . What is the capacitive current?

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

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

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

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

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

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

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