Electricity and Magnetic Fundamentals

251. What is the SI unit of conductance?

1. Siemens
2. Mhos
3. Ohms
4. 1/Ohms

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252. What is the SI unit of conductivity?

1. Ohms/m
2. Ohms-m
3. Siemens-m
4. Siemens/m

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253. What is the SI unit of magnetic flux?

1. Tesla
2. Weber
3. Maxwell
4. Gauss

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254. What is the SI unit of reluctance?

1. At
2. At/m
3. N/Wb
4. At/Wb

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255. What is the SI unit of specific resistance or resistivity?

1. Ohm-circular mil per inch
2. Ohm-circular mil per foot
3. Ohm-m
4. Ohm-cm

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256. What is the typical saturation flux density for most magnetic materials?

1. 4 Wb/m∧2
2. 5 Wb/m∧2
3. 1 Wb/m∧2
4. 2 Wb/m∧2

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257. What is the unit of magnetomotive force?

1. Volt
2. Tesla
3. Ampere- turn
4. Weber

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258. What is the unit of reluctance?

1. Maxwell
2. Gauss
3. At/Wb
4. Weber

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259. What is the usual value of leakage coefficient for electrical machines?

1. 0.5 to 1
2. 1 to 5
3. 5 to 10
4. 1.15 to 1.25

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260. What is the value of the absolute permittivity of air?

1. 8.854 μF/m
2. 8.854 X 10∧-12 mF/m
3. 8.854 X 10∧-12 F/m
4. 8.854 X 10∧-12 μF/m

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