JEE Main & Advanced Physics Semiconducting Devices Question Bank

done Numerical Value Type Questions - Semiconductor Electronics Total Questions - 12

• question_answer1)
  The energy of a photon of sodium light \[(\lambda =5890\overset{\text{o}}{\mathop{\text{A}}}\,)\] equals the band gap of a semiconductor. Find minimum energy (in eV) required to create an electron-hole pair.
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• question_answer2)
  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 of 100 milli watts. What should be the value of the resistor R (in Ω), connected in series with the diode for obtaining maximum current.
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• question_answer3)
  Find value of current in the circuit (in amp)
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• question_answer4)
  If a full wave rectifier circuit is operating from 50 Hz mains, the fundamental frequency in the ripple will be (in Hz)?
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• question_answer5)
  In a full wave rectifiers input ac current has a frequency v. The output frequency of current is nv then find value of n.
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• question_answer6)
  What is the voltage gain in a common-emitter amplifier, where input resistance is 3Ω and load resistance\[24\Omega \]? Take \[\beta =0.6\]-
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• question_answer7)
  In an NPN transistor \[{{10}^{10}}\]electrons enter the emitter in \[{{10}^{-6}}s.\]2% of the electrons are lost in the base. The current transfer ratio will be?
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• question_answer8)
  For a common base amplifier, the values of resistance gain and voltage gain are 3000 and 2800 respectively. The current gain will be?
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• question_answer9)
  Forbidden energy gap of a silicon semiconductor is 1.12 eV. In order to generate electron-hole pairs in it, the maximum wavelength of the incident photons will be \[(in\overset{\text{o}}{\mathop{\text{A}}}\,)?\]
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• question_answer10)
  Find current (in mA) through an ideal PN junction shown in the following circuit diagram.
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• question_answer11)
  In the figure, an A.C. of 200 rms voltage is applied to the circuit containing diode and the capacitor and it is being rectified. Find the potential (in volt) across the capacitor C.
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• question_answer12)
  Find the value of current (in amp) in the following diagram.
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