AC Theory Level 2 Lesson 2 Practice Questions and Answers

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AC Theory Level 2 Lesson 2
Practice Questions and
Answers




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AC Theory Level 2 Lesson 2 Practice Questions and Answers

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AC Theory, Level 2, Lesson 2
Study online at https://quizlet.com/_9rsg4r

1. 1.) A circuit that contains resistance and capac- True
itance is called an RC circuit.

2. For a series RC circuit, the ? must be the same Current
through all parts of the circuit.

3. When solving a series RC circuit, the voltage is False
the reference.

4. What is the total resistance of the circuit 11 Ω
shown?

5. What is the total capacitance of the circuit 55 nF
shown? Calculate to the nearest whole number
of the unit specified.

6. Label the correct impedance triangle to show Z is hypotenuse, R is adjacent, Xc is
the vector relationships for an RC series circuit. opposite.

7. Given the circuit and parameters shown, solve Z = R² + X꜀²
for the following: (Round the FINAL answers Z = 40² + 60²
to at least two decimal places in the specified Z = 72.11 Ω *
unit.) Eᵣ = Iₜ x R
Eᵣ = 3.5 x 40
Eᵣ = 140 V *
E꜀ = Iₜ x X꜀
E꜀ = 3.5 x 60
E꜀ = 210 V *
Eₜ = Iₜ x Z
Eₜ = 3.5 x 72.11
Eₜ = 252.39 V *
Pᵣₑₐ꜀ₜ = Iₜ x E꜀
Pᵣₑₐ꜀ₜ = 3.5 x 210
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AC Theory Level 2 Lesson 2 Practice Questions and Answers

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AC Theory, Level 2, Lesson 2
Study online at https://quizlet.com/_9rsg4r

Pᵣₑₐ꜀ₜ = 735 VAR *
Pₐₚₚ = Iₜ x Eₜ
Pₐₚₚ = 3.5 x 252.39
Pₐₚₚ = 883.36 VA *
Pₜᵣᵤₑ = Iₜ x Eᵣ
Pₜᵣᵤₑ = 3.5 x 140
Pₜᵣᵤₑ = 490 W *
PF = R / Z x 100
PF = .11 x 100
PF = 55.47 % *
θ = cos⁻¹(R/Z)
θ = cos⁻¹(.11)
θ = 56.31°

8. Consider the series circuit shown below. Drag Er is adjacent, Ec is opposite, Et is
the labels to the appropriate vectors on the hypotenuse.
correct vector diagram below.

9. Using the circuit shown below, label the sides Side A is 490 W, Side B is 735 VAR,
of the power triangle with the correct label and Side C is 883.4 VA
value.

10. A series circuit contains 40 ohms of resistance Z = R² + X꜀²
(R) and 70 ohms of capacitive reactance (Xc). Z = 40² + 70²
When 100 volts AC are applied, how much cur- Z = 80.62 Ω *
rent flows? (Round the FINAL answer to two I=E/Z
decimal places.) I = .62
I = 1.24 A

11. A series circuit has a large Xc and small R. The False
power factor is close to 100%.

12. True
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AC Theory Level 2 Lesson 2 Practice Questions and Answers

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AC Theory, Level 2, Lesson 2
Study online at https://quizlet.com/_9rsg4r

A series circuit has a large R and small Xc. The
phase angle is close to 0°.

13. A circuit has a resistor and a capacitor connect- increases
ed in series and operating at a certain frequen-
cy. If the frequency is increased, the current ? .

14. A circuit has a resistor and a capacitor con- decreases
nected in series and operating at a certain fre-
quency. If the frequency is increased, the phase
angle ? .

15. A circuit has a resistor and a capacitor connect- increases
ed in series and operating at a certain frequen-
cy. If the frequency is increased, the power fac-
tor ? .

16. A circuit has a resistor and a capacitor connect- decreases
ed in series and operating at a certain frequen-
cy. If the frequency is increased, the impedance
?.

17. A circuit has a resistor and a capacitor connect- decreases
ed in series and operating at a certain frequen-
cy. If the frequency is increased, the capacitive
reactance ? .

18. Given the circuit and parameters shown, solve X꜀ = πƒC
for the following: (Round the FINAL answers X꜀ = 2π × 60 × 0.000 015
to at least two decimal places in the specified X꜀ = 176.84 Ω *
unit.) Z = R² + X꜀²
Z = 140² + 176.84²
Z = 225.55 Ω *
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AC Theory Level 2 Lesson 2 Practice Questions and Answers