Electricity and Magnetic Fundamentals

201. The property of a material which opposes the creation of magnetic flux in it

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

View answer

202. The property of magnetic materials of retaining magnetism after withdrawal of the magnetizing force is known as

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

View answer

203. The quantity 10∧6 maxwells is equivalent to one

1. Weber
2. Gauss
3. Gilbert
4. Tesla

View answer

204. The quantity of magnetism retained by a magnetic material after withdrawal of the magnetizing force is called

1. Leftover magnetism
2. Hysteresis
3. Residual magnetism
4. Coercivity

View answer

205. The ratio between the intensity of magnetization produced in a substance to the magnetizing force producing it

1. Magnetic Reluctivity
2. Magnetic Resistivity
3. Magnetic susceptibility
4. Magnetic conductivity

View answer

206. The ratio of the permeability of material to the permiabiity of air or vacuum.

1. Relative permeability
2. Relative permittivity
3. Relative conductivity
4. Relative reluctivity

View answer

207. The ratio of the total flux (flux in iron path) to the useful flux (flux in air gap)

1. Leakage flux
2. Leakage current
3. Leakage coefficient
4. Leakage factor

View answer

208. The relation between absolute permittivity of air (c0), absolute permeability of air (μ0) and velocity of light (c) is given by

1. μ0ε0 = c'2
2. μ0ε0 = c
3. 1/μ0ε0 = c
4. 1/μOεO = cA2

View answer

209. The relative permeability of a magnetic material is 10∧5. What is its permeability?

1. 4π X 10∧5 H/m
2. 4π X 10∧-12 H/m
3. 4π t X 10∧-2 H/m
4. 4π X 10∧-7 H/m

View answer

210. The reluctance of a magnetic circuit is not dependent on which of the following?

1. Number of turns of coil
2. Magnetomotive force
3. Flux density in the circuit
4. Current in the coil

View answer