PYQSide ExamsMy practice

Semiconductor Electronics · Question 29

JEE Main 2025 (Online) 2nd April Morning ShiftMCQEasy📈 Topic in 23% papers+4−1
1

A zener diode with 5 V zener voltage is used to regulate an unregulated dc voltage input of 25 V. For a 400 resistor connected in series, the zener current is found to be 4 times load current. The load current (IL) and load resistance (RL) are :

  1. IL = 0.02 mA; RL = 250
  2. IL = 10 A; RL = 0.5
  3. IL = 10 mA; RL = 500
  4. IL = 20 mA; RL = 250

Answer

(3) IL = 10 mA; RL = 500

Solution

Current through series resistor: I = 25 - 5400 = 0.05 A = 50 mA

I = IZ + IL = 4IL + IL = 5IL

IL = 10 mA

Load is in parallel with the zener VL = 5 V

RL = 510 10-3 = 500

Answer: (3)

JEE Main 2025 (Online) 2nd April Morning Shift

Keep practising — Semiconductor Electronics

2

In the digital circuit shown in the figure, for the given inputs the P and Q values are : [figure]

  1. P = 0, Q = 1
  2. P = 1, Q = 0
  3. P = 0, Q = 0
  4. P = 1, Q = 1
JEE Main 2025 (Online) 2nd April Evening Shift
3

[figure] For the circuit shown above, equivalent GATE is :

  1. NOT gate
  2. NAND gate
  3. AND gate
  4. OR gate
JEE Main 2025 (Online) 29th January Morning Shift
4

Which of the following circuits has the same output as that of the given circuit? [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
JEE Main 2025 (Online) 28th January Morning Shift
5

[figure] In the circuit shown here, assuming threshold voltage of diode is negligibly small, then voltage VAB is correctly represented by:

  1. [figure]
  2. [figure]
  3. VAB would be zero at all times.
  4. [figure]
JEE Main 2025 (Online) 28th January Evening Shift

All Semiconductor Electronics PYQs →

PDFDownload Semiconductor Electronics PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇
All JEE Main Physics chapters
Class 11Units and MeasurementsMotion in a Straight LineMotion in a PlaneLaws of MotionWork, Energy and PowerSystem of Particles and Rotational MotionGravitationMechanical Properties of SolidsMechanical Properties of FluidsThermal Properties of MatterThermodynamics (Physics)Kinetic TheoryOscillationsWaves
Class 12Electric Charges and FieldsElectrostatic Potential and CapacitanceCurrent ElectricityMoving Charges and MagnetismMagnetism and MatterElectromagnetic InductionAlternating CurrentElectromagnetic WavesRay Optics and Optical InstrumentsWave OpticsDual Nature of Radiation and MatterAtomsNucleiSemiconductor ElectronicsExperimental Skills (Physics)