Question: The true value of flux density in a ring specimen is ____________Where B’ = measured value of the flux density,H = magnetizing force.A<sub>s</sub> = area of cross section of specimenA<sub>c</sub> = area of cross section of coil producing magnetizing force.
Answer:
MCQ: The true value of flux density in a ring specimen is ____________Where B’ = measured value of the flux density,H = magnetizing force.A<sub>s</sub> = area of cross section of specimenA<sub>c</sub> = area of cross section of coil producing magnetizing force.
Correct Answer:
A. B = B’ + µ<sub>0</sub>H(A<sub>c</sub>/A<sub>s</sub> -1)
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Related Questions
- 1. The reason for using ring type specimens for ballistic tests is :
- 2. Burrow’s permeameter is preffered to other permeameters as it :
- 3. In an Epstein square, used for finding the iron loss in a stack of laminations, the laminations are so arranged that
- 4. In a Lloyd Fisher square used for determination of iron loss in a specimen of iron laminations, the current coil of the wattmeter is connected in the primary winding circuit, while the pressure coil is connected in the secondary winding circuit. This is done so that :
- 5. Iron losses in a specimen of iron are determined by using co-ordinate type of potentiometer. The loss component of no load current is ready by :
- 6. The iron loss when measured in the specimen of laminations at a constant maximum flux density of 1.3 Wb/m<sup>2</sup> are : 20W at 40 Hz and 40 W a 60 Hz. What are the hysteresis and eddy current losses at 50Hz and a flux density of 1.3 Wb/m<sup>2</sup> ?
- 7. Magnetizing force is measured by nuclear magnetic resonance method. The expression for magnetizing force is_________Where f = frequency in Hz,h = planck’s constant andv<sub>p </sub> = gyrometric ratio.
- 8. Permanent magnets are tested by :
- 9. The optical spectrum has wavelengths ranging from :
- 10. The visible spectrum has wavelengths ranging from :
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