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Saturday, 31 October

JEE Main 2021 · PhysicsNumerical answerNumerical valueMediumData or graph

JEE Main 18 March 2021, Shift 2, Physics Q25

Question 25 of 90 in this shift, Physics question 25 of 30, Section B.

The typical output characteristics curve for a transistor working in the common-emitter configuration is shown in the figure. The estimated current gain from the figure is _________.

The figure, in words

Graph with ICI_C (mA) on the vertical axis (marks 0, 2, 4, 6, 8) and VCEV_{CE} (V) on the horizontal axis. Four curves, each rising steeply from the origin region then flattening, labelled IB=40 μAI_B=40\ \mu A (plateau at 8 mA), IB=30 μAI_B=30\ \mu A (6 mA), IB=20 μAI_B=20\ \mu A (4 mA) and IB=10 μAI_B=10\ \mu A (2 mA); dashed horizontal lines run from the vertical-axis marks 8, 6, 4, 2 to the curves; a sloping straight line from the origin passes through the knees of the curves.

Official answer

200

NTA final key.

Chapter
Semiconductor Electronics: Materials, Devices and Simple Circuits
Topic
Transistors
Idea tested
CE Configuration Characteristics

Same topic in other shifts

All Transistors questions
  1. 8 Apr 2023, Shift 2 · Q43For a given transistor amplifier circuit in CE configuration VCC=1V_{CC} = 1 V, RC=1R_C = 1 kΩ\Omega, Rb=100R_b = 100 kΩ\Omega and β=100\beta = 100.…EasySingle correctHas a figure
  2. 12 Apr 2023, Shift 1 · Q49In an n-p-n common emitter (CE) transistor the collector current changes from 5 mA to 16 mA for the change in base current from 100 μ\muA…EasySingle correct
  3. 13 Apr 2023, Shift 1 · Q59From the given transfer characteristic of a transistor in CE configuration, the value of power gain of this configuration is 10x10^x, for…MediumNumerical valueHas a figure
  4. 26 Jul 2022, Shift 2 · Q56The typical transfer characteristics of a transistor in CE configuration is shown in figure. A load resistor of 2 kΩk\Omega is connected…MediumNumerical valueHas a figure
  5. 27 Jul 2022, Shift 2 · Q49For a constant collector-emitter voltage of 8 V, the collector current of a transistor reached to the value of 6 mA from 4 mA, whereas…EasySingle correct
  6. 28 Jul 2022, Shift 2 · Q19An n.p.n transistor with current gain β\beta = 100 in common emitter configuration is shown in figure. The output voltage of the…MediumSingle correctHas a figure

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.