Electricity and Magnetic Fundamentals

121. Paramagnetic substance has a relative permeability of

1. Slightly less than one
2. Equal to one
3. Slightly equal to one
4. Very much greater than one

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122. Permanent magnets can be found in

1. electric bells
2. earphones
3. relays
4. dynamic loudspeakers

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123. Permeability means

1. The conductivity of the material for magnetic lines of force
2. The magnetization test in the material after exciting field has been removed
3. The strength of an electromagnet
4. The strength of the permanent magnet

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124. Permeance is analogous to

1. Conductance
2. Reluctance
3. Admittance
4. Resistance

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125. Permeance of a magnetic circuit is _________ the cross-sectional area of the circuit.

1. directly proportional to
2. inversely proportional to
3. dependent of
4. independent of

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126. Referred to as the specific reluctance of a material

1. Resistivity
2. Reluctivity
3. Conductivity
4. Permeability

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127. Refers to the magnetic lines

1. Flux
2. Hysteresis
3. Current
4. Magnetomotive force

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128. Refers to the non- metallic materials that have the ferromagnetic properties of iron.

1. Ferrites
2. Ferromagnetic
3. Diamagnetic
4. Paramagnetic

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129. Residual magnetism refers to the flux density, which exists in the iron core when the magnetic field intensity is

1. Minimized
2. Reduced to zero
3. Maximize
4. Unity

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130. Small voltages generated by a conductor with current in an external magnetic field.

1. Skin effect
2. Magnetic effect
3. Hall effect
4. Flywheel Effect

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