Materials and Components Electrical contact materials used in switches, brushes, relay must possess High thermal conductivity and high melting point Low thermal conductivity and low melting pointL Low thermal conductivity and high melting point High thermal conductivity and low melting point High thermal conductivity and high melting point Low thermal conductivity and low melting pointL Low thermal conductivity and high melting point High thermal conductivity and low melting point ANSWER DOWNLOAD EXAMIANS APP
Materials and Components The materials which become polarized on the application of mechanical stress are called piezoelectric. False True False True ANSWER DOWNLOAD EXAMIANS APP
Materials and Components The most important set of specifications of transformer oil include flash point and viscosity dielectric strength and flash point dielectric strength and viscosity viscosity and flash point flash point and viscosity dielectric strength and flash point dielectric strength and viscosity viscosity and flash point ANSWER DOWNLOAD EXAMIANS APP
Materials and Components When a dielectric material is subjected to alternating field, the absorption of energy by the material from the field is given by the imaginary part of polarizability. True False True False ANSWER DOWNLOAD EXAMIANS APP
Materials and Components In a metal, the valence electrons Either B or C Are not shared Are shared only between neighbouring atoms Are shared by all atoms Either B or C Are not shared Are shared only between neighbouring atoms Are shared by all atoms ANSWER DOWNLOAD EXAMIANS APP
Materials and Components If a small amount of Cu is added to Ni conductor, then Resistivity of Ni remains the same Residual resistivity of Ni at low temperature will increase as Cu atoms act as defect centres Resistivity of Ni will decrease at all temperatures because Cu is a better conductor than Ni Resistivity of Ni will increase at all temperatures as Cu destroys the periodicity of Ni and acts as defects Resistivity of Ni remains the same Residual resistivity of Ni at low temperature will increase as Cu atoms act as defect centres Resistivity of Ni will decrease at all temperatures because Cu is a better conductor than Ni Resistivity of Ni will increase at all temperatures as Cu destroys the periodicity of Ni and acts as defects ANSWER DOWNLOAD EXAMIANS APP
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