A) high carrier mobility B) high resistivity at room temperature C) a very wide range gap D) very low conductivity at room temperature. Ans : (A)
A) piezoelectric B) ferrite C) pyroelectric D) perromagnetic above 768oC. Ans : (B)
A) increases the mechanical strength B) reduce the resistivity C) improve heat dissipation D) withstand higher temperature. Ans : (D)
A) bound electrons or ion oscillation and dipole relaxation B) bound electrons oscillation and relaxations free space charge C) free electrons oscillation and relaxation of free space charge D) free electrons or iron oscillation and dipole relaxation. Ans : (A)
A) Weiss temperature B) Critical temperature C) Neel temperature D) Peak temperature. Ans : (C)
A) Acrylonitrile butadiene styrene B) Polyvinyl chloride C) Polytetrafluoroethylene D) Phenol formaldehyde. Ans : (B)
A) high hysteresis loss materials B) high eddy current loss materials C) hard magnetic materials D) soft magnetic materials. Ans : (D)
A) become twice B) become half C) become four times D) remain unchanged. Ans : (D)
A) Shockley-Read-Hall recombination B) Surface recombination C) Auger recombination D) Radiative recombination. Ans : (C)
A) High stiffness and strengths B) Low densities C) Unusual electrical property D) None-ductile. Ans : (D)