Related InterviewSolutions

• What is a digital circuit?
• How many rows are there in the truth table of a 3-input gate?
• What are the three ways of representing a logic gate?
• White Light LEDs or White LED Lamps: Shuji Nakamura, a Japanese – born American electronic engineer invented the blue LED. He was awarded the Nobel prize for physics for 2014. He was also awarded the global energy prize in the year 2015. His invention of blue LED made the fabrication of white LED possible.LED lamps, bulbs, street lighting are becoming very popular these days because of the very high efficiency of LEDs in terms of light output per unit input power(in milliWatts), as compared to the incandescent bulbs. So for general purpose lightings, white light is preferred.Commercially available white LEDs are normally manufactured by using the technique of wavelength conversion. It is a process which partly or completely converts the radiation of a LED into white light. There are many ways of wavelength conversion. One of these methods uses blue LED and yellow phosphor. In this method of wavelength conversion, a LED which emits blue colour is used to excite a yellow colour phosphor. This results in the emission of yellow and blue light and this mixture of blue and yellow light gives the appearance of white light. This method is the least expensive method for producing white light.
• The logic gate which produces LOW output when any one of the input is HIGH and produces HIGH output only when all of its inputs are LOW is called(A) an AND gate (B) an OR gate (C) a NOR gate (D) a NAND gate.
• What would happen if both junctions of a BJT are forward biased or reverse biased?
• The Boolean expression for an Exclusive OR gate is (A) A + B (B) A ⊕ B(C) \(\overline{A+B}\)(D) A ∙ B
• Which logic gate corresponds to the truth tableABY001010100110(A) AND (B) NOR (C) OR (D) NAND
• The lightly doped, thin base region sandwiched between the heavily doped emitter region and the intermediate doped collector region plays a crucial role in the transistor action.
• An LED emits visible light when its(A) junction is reverse biased(B) depletion region widens(C) holes and electrons recombine(D) junction becomes hot.