low copper loss
low eddy current loss
low resistivity
higher specific gravity compared to iron
Correct answer is C
Ferrite is a low density material of composition with Fe2O3 x O, where x is a bivalent metal, such as Cobart, Ni, Mn. These magnetic materials have very low loss of current and used in high frequency circuit.
When a voltage is applied to a semiconductor crystal, then the free electrons will flow
towards positive terminal
towards negative terminal
either towards positive terminal or negative terminal
towards positive terminal for 1 μs and towards negative terminal for next 1 μs
Correct answer is A
Since electrons are negatively charged they will flow towards positive terminal.
At very high temperatures, the extrinsic semi conductors become intrinsic because
of drive in diffusion of dopants and carriers
band to band transition dominates over impurity ionization
impurity ionization dominates over band to band transition
band to band transition is balanced by impurity ionization
Correct answer is B
Covalent bonds are broken.
In the circuit above, the function of resistor R and diode D are
to limit the current and to protect LED against over voltage
to limit the voltage and to protect LED against over current
to limit the current and protect LED against reverse breakdown voltage.
none of the above.
Correct answer is C
Resistance limits current and diode is reverse connected and therefore protects LED against reverse breakdown.
Aptitude Tests