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| 1 | When alternating current flows in an inductance, the amount of current is much greater than the dc resistance alone would allow. |
 | A) | True |
| B) | False |
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| 2 | The inductive reactance is the ohms of opposition that an inductance has for square-wave current. |
| A) | True |
| B) | False |
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| 3 | The amount of inductive reactance equals two pi times the frequency times the inductance. |
| A) | True |
| B) | False |
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| 4 | There is no inductive reactance for steady direct current. |
| A) | True |
| B) | False |
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| 5 | XL is measured in henries. |
| A) | True |
| B) | False |
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| 6 | The combined parallel inductive reactance will be less than the lowest branch reactance. |
| A) | True |
| B) | False |
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| 7 | The amount of current in an ac circuit with only inductive reactance is equal to the applied voltage divided by the inductive reactance. |
| A) | True |
| B) | False |
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| 8 | In a series circuit containing two inductors and a voltage source, the current is the same in both series reactances. |
| A) | True |
| B) | False |
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| 9 | In a parallel circuit with two inductors and voltage source, the current is the same in both inductors. |
| A) | True |
| B) | False |
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| 10 | For the most part, inductor values below are not practical for use in electronic circuits. |
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| 11 | With iron-core coils, the hysteresis and eddy-current losses with frequency. |
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| 12 | For an inductor, the induced voltage VL always the current I by 90°. |
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| 13 | Inductive reactance is measured in . |
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| 14 | Inductive reactance only applies to wave ac. |
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| 15 | The combined parallel inductive reactance branch will be than the lowest branch reactance. |
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| 16 | With coils, the hysteresis and eddy-current losses increase with frequency. |
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| 17 | For an inductor, the induced voltage, VL always leads the current by degrees. |
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| 18 | Frequency is equal to |
| A) | 2π x T |
| B) | 2π/T |
| C) | π/T |
| D) | 1/T |
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| 19 | When alternating current flows in an inductance, |
| A) | the current is less than the dc resistance alone would allow |
| B) | the current is more than the dc resistance alone would allow |
| C) | the ac current is not affected by dc resistance |
| D) | the ac current is not affected by inductance |
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| 20 | What is the inductive reactance for steady direct current? |
| A) | 600 Ω |
| B) | 75 Ω |
| C) | ∞ Ω |
| D) | 0 Ω |
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| 21 | Which of the following is not an example of how XL is generally used? |
| A) | block dc |
| B) | high opposition to high frequency ac |
| C) | little opposition to dc |
| D) | low opposition to low frequency ac |
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| 22 | What results from an inductor's counter emf with a varying current? |
| A) | transformer action |
| B) | impedance |
| C) | resistance |
| D) | inductive reactance |
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| 23 | The polarity of a coil's counter emf is always such that |
| A) | it aids a change in current |
| B) | it opposes a change in current |
| C) | it aids a change in voltage |
| D) | it opposes a change in voltage |
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| 24 | How much is the XL for a coil with negligible resistance that has 62.8 V across it with 0.1 A of current? |
| A) | 62.8 Ω |
| B) | 628 Ω |
| C) | 6280 Ω |
| D) | 62,800 Ω |
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| 25 | The values of XL in series or in parallel are combined |
| A) | the same way as ohms of resistance |
| B) | the same way as farads of capacitance |
| C) | by using Pythagorean's theorem |
| D) | by algebraic addition |