Q. Calculate the reluctance when the magnetomotive force is 10A turns and the flux is 5Wb.

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Q. Ohm’s law for magnetic circuits is _________

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Q. What happens to the MMF when the magnetic flux decreases?

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Q. Calculate the MMF when the magnetic flux is 5Wb and the reluctance is 3A/Wb.

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Q. A ring having a cross-sectional area of 500 mm², a circumference of 400 mm and ϕ=800microWb has a coil of 200 turns wound around it. Calculate the flux density of the ring.

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Q. A ring having a cross-sectional area of 500 mm², a circumference of 400 mm and ϕ=800microWb has a coil of 200 turns wound around it. Relative permeability of ring is 380. Calculate the reluctance.

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Q. A ring having a cross-sectional area of 500 mm², a circumference of 400 mm and ϕ=800microWb has a coil of 200 turns wound around it. Relative permeability of ring is 380. Calculate the magnetomotive force.

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Q. A ring having a cross-sectional area of 500 mm², a circumference of 400 mm and ϕ=800microWb has a coil of 200 turns wound around it. Relative permeability of ring is 380. Calculate the magnetising current.

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Q. Can we apply Kirchhoff’s law to magnetic circuits?

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Q. What is MMF?

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Q. The equivalent of the current I in magnetic ohm’s law is?

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Q. The B/H characteristics can be determined using _______

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Q. The B/H curve can be used to determine?

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Q. The B/H ratio is not constant for ________

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Q. When using a fluxmeter, if the flux changes from Φ to -Φ, what happens to the current?

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Q. Why is the coil of a ballistic galvanometer wound on a non- metallic former?

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Q. The ballistic galvanometer is usually lightly damped so that ________

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Q. PMMC instruments can be used as a fluxmeters by _______

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Q. Hysteresis loss is determined from _______

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Q. What is a PMMC instrument?

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