Question 1 : B/H curve shows the relationship between?
1. Magnetic field strength and magnetic flux
2. Magnetic field strength and magnetic flux density
3. Current and magnetic flux density
4. Voltage and magnetic flux density
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Question 2 : What is a PMMC instrument?
1. Permanent moving magnet coil instrument
2. Permanent machine magnet coil instrument
3. Permanent moving machine coil instrument
4. Premature moving magnet coil instrument
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Question 3 : Hysteresis loss is determined from _______
1. B/H curve
2. H/B curve
3. BH curve
4. B²H curve
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Question 4 : PMMC instruments can be used as a fluxmeters by _______
1. Using a low resistance shunt
2. Removing the control spring
3. Making the control springs having a large moment of inertia
4. Using a high resistance in series
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Question 5 : The ballistic galvanometer is usually lightly damped so that ________
1. It can oscillate
2. It will remain stable
3. Amplitude of the first swing is very large
4. Amplitude of the first swing is very small
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Question 6 : Why is the coil of a ballistic galvanometer wound on a non- metallic former?
1. To minimise damping when high resistance is connected in series
2. To maximise damping when high resistance is connected in series
3. To minimise damping when high resistance is connected in parallel
4. To maximise damping when high resistance is connected in parallel
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Question 7 : When using a fluxmeter, if the flux changes from F to -F, what happens to the current?
1. Becomes zero
2. Becomes infinity
3. Remains the same
4. Reverses
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Question 8 : The B/H ratio is not constant for ________
1. Diamagnetic materials
2. Ferromagnetic materials
3. Paramagnetic materials
4. Non-magnetic materials
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Question 9 : The B/H curve can be used to determine?
1. Iron loss
2. Hysteresis loss
3. Voltage loss
4. Eddy current loss
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Question 10 : The B/H characteristics can be determined using _______
1. Ammeter
2. Fluxmeter
3. Voltmeter
4. Multimeter
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