Material Science | True-False Questions | Electricalvoice

Material Science | True-False Questions

Q. A magnetic pole is a terminal where a magnetic material meets a non-magnetic material.

Answer
True

Q. The net magnetic flux emerging through a closed surface is zero.

Answer
True

Q. A toroidal magnet has no air gap.

Answer
True

Q. The toroidal type of construction is employed where there must be a minimum of external magnetic field.

Answer
True

Q. With the insertion of an iron core into a coil, magnetic field is strengthened.

Answer
True

Q. With the insertion of an iron core into a coil the reluctance of the iron path increases.

Answer
False

Q. Ferromagnetism arises out of the electron structure.

Answer
True

Q. When a ferromagnetic material is magnetized its magnetic poles get oriented in the direction of coercive force.

Answer
False

Q. During the process of magnetization when all the magnetic dipoles of a magnetic material get oriented in one direction, the core is said to be grain oriented.

Answer
False

Q. Static magnetic fields induce currents in closed conducting loops.

Answer
False

Q. The material commonly used for shielding or screening magnetism is brass.

Answer
True

Q. When the iron price is magnetized various molecules are forced into more definite alignment.

Answer
True

Q. Poles of a magnet cannot be separated.

Answer
True

Q. The direction of magnetic lines of force is from N-pole to S-pole.

Answer
True

Q. Lines of force never intersect.

Answer
True

Q. High silicon steel has comparatively higher permeability and high saturation.

Answer
False

Q. Hysteresis loss is the amount of energy dissipated as heat in the magnetic material.

Answer
True

Q. Eddy current losses are reduced by using thin plates of high resistivity material.

Answer
True

Q. Neutral temperature of a thermocouple is constant for a given thermocouple.

Answer
True

Q. Thomson effect is not present in lead.

Answer
True

Q. Thermoelectric power at neutral temperature is maximum.

Answer
False
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