Question 11 : What is MMF?
1. Magnetic Machine Force
2. Magnetomotive Force
3. Magnetic Motion Force
4. Magnetomotion Force
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Question 12 : A ring having a cross-sectional area of 500 mm², a circumference of 400 mm and ?=800microWb has a coil of 200 turns wound around it. Relative permeability of ring is 380. Calculate the magnetising current.
1. 6.7A
2. 7.7A
3. 7.6
4. 6.1A
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Question 13 : A ring having a cross-sectional area of 500 mm², a circumference of 400 mm and ?=800microWb has a coil of 200 turns wound around it. Relative permeability of ring is 380. Calculate the magnetomotive force.
1. 1442At
2. 1342At
3. 1432At
4. 1344At
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Question 14 : A ring having a cross-sectional area of 500 mm², a circumference of 400 mm and ?=800microWb has a coil of 200 turns wound around it. Relative permeability of ring is 380. Calculate the reluctance.
1. 1.68 * 10^-4A/Wb
2. 1.68 * 10⁴ A/Wb
3. 1.68 * 10⁶ A/Wb
4. 1.68 * 10^-6A/Wb
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Question 15 : A ring having a cross-sectional area of 500 mm², a circumference of 400 mm and ?=800microWb has a coil of 200 turns wound around it. Calculate the flux density of the ring.
1. 1.6T
2. 2.6T
3. 3.6T
4. 4.6T
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Question 16 : Calculate the MMF when the magnetic flux is 5Wb and the reluctance is 3A/Wb.
1. 10At
2. 10N
3. 15N
4. 15At
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Question 17 : Calculate the reluctance when the magnetomotive force is 10A turns and the flux is 5Wb.
1. 0.5A/Wb
2. 5A/Wb
3. 10A/Wb
4. 2A/Wb
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Question 18 : As the magnetic flux density increases, the reluctance _____________
1. Increases
2. Decreases
3. Remains the same
4. Becomes zero
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Question 19 : As the magnetic field strength increases, reluctance?
1. Increases
2. Decreases
3. Remains the same
4. Becomes zero
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Question 20 : The electrical equivalent of reluctance is?
1. Resistance
2. Inductance
3. Capacitance
4. Conductance
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