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hard ferrites are used for makinga transformer cores b electrical
aluminium isa silvery white in colour b yellow in colourc reddish in colour d pale yellow in
the percentage of carbon in mild steel isa 008 to 03 b 05 to 14 c 235
the most malleable ductile low resistivity material isa copper b aluminiumc silver d ironansthe most malleable ductile low resistivity
the heating elements of electric irons are made ofa copper b nichromec constantan d aluminiumansthe heating components of
barrier potential in a p-n junction is caused bya thermally generated electrons and holesb diffusion of majority carriers across the junction c
in order to obtain p-type germanium it should be doped with aa trivalent impurity b tetravalent impurityc pentavalent impurity d
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
transformer cores are laminated witha low carbon steelb silicon sheet steelc nickel alloy steeld chromium sheet steelanstransformer cores are
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
copper constantan is used for measuring temperature up toa 1400o cb 800oc c 1100ocd 400oc anscopper constantan is used for measuring temperature
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
ferrites area ferromagnetic materialb ferrimagnetic materialsc anti ferromagnetic materiald diamagnetic materialsansferrites are ferromagnetic