GATE Question Bank » ECE » ANALOG CIRCUITS
A) Secondary cells have limited life
B) In the primary cell the energy conversion is accompanied by changes in cell composition which are reversible
C) In a secondary cell, the chemical reactions are reversible
D) In a secondary cell, during charge, lead sulphate and water are formed
In regard to the reverse biased p-n junction photodiode the following statements are made. (1) The photon current and the saturation current are in the same direction. (2) While the photon current is essentially due to minority carriers the saturation current is due to majority carrier flow (3) The number of electron have pairs due to illumination is proportional to the number of incident photons (4) The effect of illumination can be considered as a majority carrier injection. Of the four statements, the true statements are?
In regard to semiconductor photodiodes the following statements are made. (1) In a typical volt ampere characteristic for a given illumination, the reverse current is almost constant for increasing reverse voltages. (2) Due to creation of electron hole pairs by incident photons, the percentage concentration of majority carriers is much greater than the percentage increase in minority carriers. (3) The radiation can be considered as a minority carrier injector (4) The photo-current is due to drifting of injected carriers Of these four statements, the correct statements are?
A) With increasing temperature the density of electron hole pairs increases
B) In intrinsic germanium the resistivity increases 6% per degree rise in temperature
C) At low temperature, well above 0 K, electrons move into the valence bond
D) Hole along with electrons carry current in the conduction band