In Bohr’s model of atomic structure, the nucleus consists of electrons and protons. protons. protons and neutrons. electrons. TRUE ANSWER : ? YOUR ANSWER : ?
Positive magnetostriction exists when dipoles are repel other. none of above. dipoles are attract each other. both are correct. TRUE ANSWER : ? YOUR ANSWER : ?
Almost the entire mass of an atom is concentrated in the nucleus. electrons. protons. neutrons. TRUE ANSWER : ? YOUR ANSWER : ?
ALNICO is an alloy of aluminium, nickel. iron, cobalt, nickel. iron, aluminium. aluminium, nickel, iron and cobalt. TRUE ANSWER : ? YOUR ANSWER : ?
When will be the electron pair bonding occurs ? None of these Lack holes Share holes Share electrons TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following gives materials in order of decreasing values of permeability? Permalloy, nickel, air, water. Pure iron, silicon iron, aluminium, bismuth. Silver, copper, aluminium, iron. Cobalt, nickel, aluminium, iron. TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is the least desired property in magnetic materials for electrical engineering applications ? Large hysteresis loop. High electrical resistivity. High magnetic permeability. All of these TRUE ANSWER : ? YOUR ANSWER : ?
Cryogenics is a branch of science dealing with which of the following? High temperature. Friction and wear. Low temperature. Crystal growth. TRUE ANSWER : ? YOUR ANSWER : ?
Find the odd one out. Refractive index. Absorptivity. Emissivity. Dielectric strength. TRUE ANSWER : ? YOUR ANSWER : ?
Which statement is not true of ferromagnetic materials. They lose their nonlinearly property above the Curie temperature. They have fixed value of μr. They have large magnetic susceptibility. Energy loss is proportional to the area of hysteresis loop. TRUE ANSWER : ? YOUR ANSWER : ?