Electrical Circuits

261. Which factor does not affect resistance?

1. Length
2. Resistivity
3. Cross-sectional area
4. Mass

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262. Which is considered as the effect of a dielectric material?

1. Increasing capacitance
2. Decreasing capacitance
3. Reducing the working voltage
4. Increasing the distance between the plates

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263. Which of the following capacitors are used only in dc circuits?

1. Mica
2. Ceramic
3. Mylar
4. Electrolytic

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264. Which of the following capacitors has the highest cost per μF?

1. Plastic
2. Air
3. Mica
4. Electrolytic

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265. Which of the following capacitors is suitable for dc filter circuits?

1. Mica
2. Ceramic
3. Paper
4. Electrolytic

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266. Which of the following combination of length and cross-sectional area will give a certain volume of copper the least resistance?

1. 2L and1/2 A
2. Does not matter because the volume of copper remains the same
3. L and A
4. ½ L and 2 A

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267. Which of the following describes the action of a capacitor?

1. Stores electrical energy
2. Opposes changes in current flow
3. Creates a dc resistance
4. Converts ac to dc

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268. Which of the following dielectric materials makes the highest-capacitance capacitor?

1. Air
2. Barium-strontium titanite
3. Mica
4. Electrolyte

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269. Which of the following dielectric materials makes the lowest-capacitance capacitor?

1. Paper
2. Mica
3. Air
4. Electrolyte

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270. Which of the following does not affect resistance?

1. Resistivity
2. Cross-sectional area
3. Mass
4. Length

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