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insulators havea a full valence bandb an empty conduction bandc a large energy gapdall the aboveansinsulators have a large energy
paper is hygroscopic and absorbent this statement is true or falseanspaper is hygroscopic and absorbent this statement is
in a ferromagnetic material the state of flux density is as follows when external magnetic field is applied to ita increasedb becomes zeroc remains
magnetic materialsa provide path to magnetic fluxb are good insulatorsc are semiconductorsd noneansmagnetic materials provide path to magnetic
addition of trivalent impurity to a semiconductor creates manya holesb free electronsc valance electronsd bound electronsansaddition of trivalent
hall effect is associated witha conductorsb semiconductorsc thermistorsdsoldersanshall effect is associated with
hard magnetic materials are used for makinga permanent magnetsc conductorsb insulatordtemporary magnetsanshard magnetic materials are used for making
example of high resistivity material isa nichrome b silverc gold
a transistor hasa one p-n junction b two p-n junctionc four p-n junction d five p-n junctionansa transistor has two p-n
bronze is an alloy ofa copper and tin b copper and steelc copper and mercury d
why the primary bushing of 7970138 distribution transformer blown up when connected wye on a 138 kv
if a high resolution emcoder is used for position control will the number of pole count in the dc motor be matter what is the requirement for the dc
calculate the diameter of copper wire of length 100 metres used as winding material in a transformer such that the resistance of the whole winding is
a 6 v 25 ma relay is connected in the output stage of a transistor the coil is made of aluminium having alpha 0004 the resistance of the coil
the field resistance of a dc machine is 50 ohm at 20oc the resistance increases to 55 ohm at 50oc find the temperature coefficient of the resistance
the resistivity of pure copper is 156 micro-ohm -cm an alloy of copper contains 1 atomic percent nickel has a resistivity of 281 micro-ohm-cm an
the resistance of a wire is 60 at 25oc and 65 at 75oc find the resistance of wire at 0oc and value of temperature co-efficient at 0o cansgiven r25
a heater element is made of nichrome wire having resistivity equal to 100 times 10-8 ohm-m the diameter of the wire is 04mm calculate the length of
an electric heater element is made of nichrome wire having resistivity equal to 100 times10-8
explain diffusiondiffusion though the mobility of the carriers in a semiconductor is greater than the electrons in metals the conductivity in the
explain mobilityaverage drift velocity of electrons e- in an applied field is proportional to the field the absolute magnitude of the proportionality
give the properties and application of permanent magnetic materialspermanent magnetic materialsproperties permanent magnetic materials have a huge
explain the energy bands in solids there are as several energy bands in a solid as there are energy levels in the parent atomsmany electrical
explain effect of frequency of applied electric fieldif an external electric field is applied the distance among charges that is related to chemical
explain dipolar polarizationdipolar polarization is a polarization which is particular to polar molecules such polarization results from permanent