Transistor characteristics (Viva voce) : Class 12 : Physics : Amrita Online Lab

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Transistor characteristics

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	1)	How many p-n junctions a transistor has?
		More than three 3 1 2

	2)	What is the condition for the proper transistor action?
		The input junction is reverse biased and output junction is forward biased. The input junction is forward biased and output junction is reverse biased. Both the junctions should be forward biased. None of these.

	3)	Why the thickness of base section of a transistor made small?
		To prevent the flow of charge carriers from emitter to collector. None of these To increase the output resistance of the transistor. In order to reduce the recombination of charge carriers passing through it.

	4)	What is the current amplification factor (α) for a common emitter configuration at constant V(CE)?
		α = ΔI(C) / ΔI(E) α = ΔI(E) / ΔI(B) α = ΔI(C) / ΔI(B) α = ΔI(B) / ΔI(C)

	5)	Choose the correct relation between the current gain of common base and common emitter configurations from the following.
		β = 1/(1- α) β = α/(1+ α) None of these β = α/(1- α)

	6)	Which of the following is not an application of a transistor?
		Amplifier None of these Switch Oscillator

	7)	Why a common emitter transistor is preferred over a common base transistor?
		Because the thickness of emitter section is much larger than that of base section. Because of the infinite input resistance of common base transistor Because the current gain in CE mode is much larger than that in CB mode. Because the current gain in CB mode is much larger than that in CE mode.

	8)	How does the collector current in a junction transistor changes when the base region has large size and is heavily doped?
		Changes if the base is p type Increases Decreases No change occurs

	9)	In which region the doping concentration of a transistor is the highest?
		Collector Emitter Base All regions have equal doping concentration.

	10)	What is the current gain for a transistor in common emitter configuration, where I(E) = 4.2 mA and I(C) = 4 mA?
		1.05 0.95 0.105 1.95

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