A NPN transistor conducts when-

Both collector and emitter are positive with respect to the base

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Collector is positive and emitter is negative with respect to the base

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Collector is positive and emitter is at same potential as the base

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Both collector and emitter are negative with respect to the base

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Solution

The correct option is B Collector is positive and emitter is negative with respect to the base

The voltage between the base and emitter is positive at the base and negative at the emitter because for an NPN transistor, the base terminal is always positive with respect to the emitter i.e., an emitter is always negative w.r.t. the base. Also, the collector supply voltage is positive with respect to the emitter. So for a bipolar NPN transistor to conduct the collector is always positive with respect to both the base and the emitter.

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Similar questions

n-p-n transistor has three leads A, B and C.
Connecting B and C by moist fingers, A to the
positive lead of an ammeter, and C to the
negative lead of the ammeter, one finds large
deflection. Then, A, B and C refer respectively
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(1) Emitter, base and collector
(2) Base, emitter and collector
(3) Base, collector and emitter
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Q. An incomplete sentence about transistors is given below:
The emitter−..... junction is __ and the collector−..... junction is __. The appropriate words for the dotted empty positions are, respectively,
(a) 'collector' and 'base'
(b) 'base' and 'emitter'
(c) 'collector' and 'emitter'
(d) 'base' and 'base'.

Q. In an NPN transistor circuit, the collector current is

10 mA

. If

90 %

of the electrons emitted reach the collector, the emitter current

(I_{E})

and base current

(I_{B})

respectively are

Q. For transistor action, state which statements are true:
(1) Base, emitter and collector regions should have similar size and doping concentrations.
(2) The base region must be very thin and lightly doped.
(3) The emitter-base junction is forward biased and base-collector junction is reverse biased
(4) Both the emitter-base junction as well as the base-collector junction are forward biased

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