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A unijunction transistor (UJT) is used to generate a ____ wave
  • a)
    square 
  • b)
    sine 
  • c)
    Parabolic
  • d)
    sawtooth
Correct answer is option 'D'. Can you explain this answer?
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A unijunction transistor (UJT) is used to generate a ____ wavea)square...
Uni Junction Transistor (UJT):
  • The uni-junction transistor is a solid-state three-terminal device that can be used in gate pulse, timing circuits, and trigger generator applications to switch and control both thyristors and triacs for AC power control type applications.
  • When a UJT is used for triggering an SCR, the wave shape of the voltage obtained from the UJT circuit is a saw-tooth wave.
  • The UJT is a three-terminal, semiconductor device which exhibits negative resistance and switching characteristics for use as a relaxation oscillator in phase control applications.
  • The device has only one junction, so it is called the unijunction device
  • The device, because of one P-N junction, is quite similar to a diode but it differs from an ordinary diode as it has three terminals
  • The structure of a UJT is quite similar to that of an N-channel JFET
  • The main difference is that P-type (gate) material surrounds the N-type (channel) material in the case of JFET and the gate surface of the JFE T is much larger than the emitter junction of UJT
  • In a unijunction transistor, the emitter is heavily doped while the N-region is lightly doped, so the resistance between the base terminals is relatively high, typically 4 to 10 kilo Ohm when the emitter is open
  • The N-type silicon bar has a high resistance and the resistance between emitter and base1 is larger than that between emitter and base2; It is because emitter is closer to base2 than base1
  • UJT is operated with emitter junction forward- biased while the JFET is normally operated with the gate junction reverse-biased
  • UJT does not have the ability to amplify but it has the ability to control a large AC power with a small signal. So that it is not used for amplification purposes. 
Applications of UJT:
  • Uses negative oscillator resistance property for the generation of the sawtooth waveform
  • Used as a Relaxation oscillator.
  • Used as a Voltage regulator.
  • Used as a switching circuit.
  • Widely used as a triggering device for silicon control rectifiers (SCR).
  • Used as a phase control circuit.
  • Used as a timing circuit.
  • Used in a sawtooth generator.
  • Used to generate magnetic flux.
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A unijunction transistor (UJT) is used to generate a ____ wavea)squareb)sinec)Parabolicd)sawtoothCorrect answer is option 'D'. Can you explain this answer?
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A unijunction transistor (UJT) is used to generate a ____ wavea)squareb)sinec)Parabolicd)sawtoothCorrect answer is option 'D'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about A unijunction transistor (UJT) is used to generate a ____ wavea)squareb)sinec)Parabolicd)sawtoothCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A unijunction transistor (UJT) is used to generate a ____ wavea)squareb)sinec)Parabolicd)sawtoothCorrect answer is option 'D'. Can you explain this answer?.
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