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plastics area good conductors of heatb good conductors of electricityc bad conductors of electricityd high densityansplastics are bad conductors of
for silicon the forbidden gap isa 11evb 025evc 05evd 07evansfor silicon the forbidden gap is
the energy of an electron of 2py orbital is1 greater than that of 2px orbital2 less than that of 2px orbital3 equal to that of 2s
transformer cores are laminated witha low carbon steelb silicon sheet steelc nickel alloy steeld chromium sheet steelanstransformer cores are
according to aufbaus principle which of the three 4d 5p and 5s will be filled with electrons first1 4d2 5d3 5s4 4d and 5s will be
the statements1 in filling a group of orbitals of equal energy it is energetically preferable to assign electrons to empty orbitals rather than
a ferrite core has less eddy current loss than an iron core because ferrites havea high resistancec low permeabilityb low resistanced high
the conductivity of copper is less than that of silver by a 5 - 10 b 50 - 60 c 80 - 90 d 20 - 30 ansthe conductivity of copper is less than silver
mica is aa dielectric material b insulating materialc magnetic material d both insulating and dielectric materialansmica is a both insulating and
for the energy levels in an atom which one of the following statements is correct1 there are seven principal electron energy levels2 the second
copper constantan is used for measuring temperature up toa 1400o cb 800oc c 1100ocd 400oc anscopper constantan is used for measuring temperature
paulis exclusion principle states that 1 nucleus of an atom contains no negative charge 2 electrons move in circular orbits around the
resistivity of conductors is most affected bya composition b temperaturec pressure
the dielectric strength of transformer oil should be a 100 v b 5 kv c 30 kv d 132 kvansthe
for germanium the forbidden gap isa 015evb 025evc 05evd 07evansfor germanium the forbidden gap is
copper is completely miscible witha nickelb goldc hydrogend leadanscopper is completely miscible with
in p-type semiconductor the majority carriers area holesb positive ionsc electronsd negative ionsansin p-type semiconductor the majority carriers are
a pure semiconductor under ordinary conditions behaves likea a conductor b an insulatorc a
eddy current loss is proportional to thea frequency b square of
manganin is an alloy ofa copper manganese and nickel b copper and manganesec manganese and nickel
hall effect may be used for which of the followinga determining whether the semiconductor is p or n typeb determining the carrier concentrationc
the relative permeability of a paramagnetic substance isa unity b slightly more than unityc zero
which of the following has the least energy1 2p 2 3p
ferrites area ferromagnetic materialb ferrimagnetic materialsc anti ferromagnetic materiald diamagnetic materialsansferrites are ferromagnetic
dielectric constant of vacuum isa infinityb 100c oned zeroansdielectric constant of vacuum is