Why vacuum is needed in a vacuum tube?...

Why vacuum is needed in a vacuum tube?

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Write the difference between the electronics devices vacuum tube (valve) and the semiconductor.

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KUMAR PRAKASHAN-SEMICONDUCTOR ELECTRONICS : MATERIALS, DEVICES AND SIMPLE CIRCUITS -Section-D : Multiple Choice Questions (MCQs) (MCQs asked in Competitive Exams)

Why vacuum is needed in a vacuum tube?
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At absolute zero temperature Si acts as ……..
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The energy band gap is maximum in …….
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Formation of covalent bonds in compounds exhibits …….nature.
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By increasing the temperature, the specific resistance of a conductor ...
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The difference in the variation of resistance with temperature in a me...
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In the middle of the electron layer of a reverse biased p-n junction, ...
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A piece of copper and another of germanium are cooled from room temper...
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The manifestion of band structure in solids is due to …….
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When p-n junction diode is forward biased ………
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The electrical conductivity of a semiconductor of a semiconductor incr...
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In a full wave rectifier circuit operating from 50 Hz mains frequency...
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Ratio of number density of holes is (7)/(5) and ratio of their current...
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Which of the following is true ?
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A charge of 2 xx 10^(-2) C moves at 30 revolutions per second in a ci...
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A solid which is transparent to visible light an whose conductivity in...
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As shown in the following figure take A and B input waveforms. Sketch...
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A logic circuit is shown in the diagram. Draw the output signal at the...
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Carbon, silicon and germanium have four valence electrons each. At roo...
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Figure shows electric field lines in which an electric dipole P is pla...
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As shown in the following figure, take A and B input waveforms. Sketch...
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