Related InterviewSolutions

• In a `p-n` junction photo cell, the value of the photo electromotive force produced by monochromatic light is proportional toA. to barrier voltage at the p-n junctionB. the intensity of the light falling on the cellC. the frequency of the light falling on the cellD. the voltage applied at the p-n junction
• The diode used in the circuit shown in the figure has a constant voltage drop of `0.5 V` at all currents and a maximum power rating fo `100` milliwatts. What should be the value of the resistor `R`, connected in series with the diode for obtaining maximum current? A. `200 Omega`B. `6.67 Omega`C. `5 Omega`D. `1.5 Omega`
• To obtain a `P`-type germanium semiconductor, it must be dopped withA. phosphorusB. indiumC. antimonyD. arsenic
• If a small amount of antimony is added to germanium crystalA. the antimony becomes an acceptor atomB. three will be more free electrons than holes in the semiconductorC. its resistance is increasedD. it becomes a p-type semiconductor
• Symbolic representation of four logic gates are shown as (i) Pick out which ones are for AND, NAND and NOT gates, respectively.A. (iii), (ii) and (i)B. (iii), (ii) and (iv)C. (ii), (iv) and (iii)D. (ii), (iii) and (iv)
• Choose the only false statement form the followingA. Substances with energy gap of the order of `10eV` are insulatorsB. The conductivity of a semiconductor increases with increases in temperatureC. In conductors the valence and conduction bands may overlapD. The resistivity of a semiconductor increases with increase in temperature
• Copper has face centred cubic `(fc c)` lattice with interatomic spacing equal to `2.54 Å`. The value of the lattice constant for this lattice isA. `1.27 Å`B. `5.08 Å`C. `2.54 Å`D. `3.59 Å`
• A n-p-n transisitor is connected in common emitter configuration in a given amplifier. A load resistance of `800 Omega` is connected in the collector circuit and the voltage drop across it is `0.8 V`. If the current amplification factor is `0.96` and the input resistance of the circuits is `192 Omega`, the voltage gain and the power gain of the amplifier will respectively beA. 3.69, 3.84B. 4,4C. 4,3.69D. 4, 3.84
• For CE transistor amplifier, the audio signal voltage across the collector resistance of `2 kOmega` is 4V. If the current amplification factor of the transistor is 100 and the base resistance is `1kOmega`, then the input signal voltage isA. `10 mV`B. `20mV`C. `30mV`D. `15mV`
• In a CE transistor amplifier, the audio signal voltage across the collector resistance of `2kOmega` is `2V`. If the base resistance is `1kOmega` and the current amplification of the transistor is 100, the input signal voltage is:A. `0.1V`B. `1.0V`C. `1mV`D. `10 mV`