Junction Transistor Multiple Choice Questions

Junction Transistor (Electronics) Physics MCQs:

Ques: The phase difference between input and output voltages of  a CE circuit is
(a) 0^o
(b) 90^o
(c) 180^o
(d) 270^o
View Answer

Ques: In a PNP transistor working as a common-base amplifier, current gain is 0.96 and emitter current is 7.2 mA. The base current is
(a) 0.4 mA
(b) 0.2 mA
(c) 0.29 mA
(d) 0.35 mA
View Answer

Related: Boolean Algebra Example Questions

Ques: An oscillator is nothing but an amplifier with
(a) Positive feedback
(b) Large gain
(c) No feedback
(d) Negative feedback
View Answer

Ques: The emitter-base junction of a transistor is …… biased while the collector-base junction is ……. Biased
(a) Reverse, forward
(b) Reverse, reverse
(c) Forward, forward
(d) Forward, reverse
View Answer

Ques: In an NPN transistor the collector current is 24 mA. If 80% of electrons reach collector its base current in mA is
(a) 36
(b) 26
(c) 16
(d) 6
View Answer

Related: Questions and Answers on Mechanical Wave

Ques: In a PNP transistor the base is the N-region. Its width relative to the P-region is
(a) Smaller
(b) Larger
(c) Same
(d) Not related
View Answer

Ques: A NPN transistor conducts when
(a) Both collector and emitter are positive with respect to the base
(b) Collector is positive and emitter is negative with respect to the base
(c) Collector is positive and emitter is at same potential as the base
(d) Both collector and emitter are negative with respect to the base
View Answer

Ques: Least doped region in a transistor
(a) Either emitter or collector
(b) Base
(c) Emitter
(d) Collector
View Answer

Related: Mass Number Questions and Answers

Ques: If l₁, l ₂, l₃ are the lengths of the emitter, base and collector of a transistor then
(a) l₁ = l ₂ = l₃
(b) l₃ < l ₂ > l₁
(c) l₃ < l ₁ < l₂
(d) l₃ > l ₁ > l₂
View Answer

Ques: The transistors provide good power amplification when they are used in
(a) Common collector configuration
(b) Common emitter configuration
(c) Common base configuration
(d) None of these
View Answer

Ques: Which of the following is true
(a) Common base transistor is commonly used because current gain is maximum
(b) Common emitter is commonly used because current gain is maximum
(c) Common collector is commonly used because current gain is maximum
(d) Common emitter is the least used transistor
View Answer

Ques: For a common base configuration of PNP transistor I_C/I_E = 0.98 then maximum current gain in common emitter configuration will be
(a) 12
(b) 24
(c) 6
(d) 5
View Answer

Ques: The most commonly used material for making transistor is
(a) Copper
(b) Silicon
(c) Ebonite
(d) Silver
View Answer

Related: MET Maths Practice Papers

Ques: 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) are given by
(a) i_E = – 1 mA, i_B = 9 mA
(b) i_E = 9 mA, i_B = – 1 mA
(c) i_E = 1 mA, i_B = 11 mA
(d) i_E = 11 mA, i_B = 1 mA
View Answer

Ques: For a transistor, the current amplification factor is 0.8. The transistor is connected in common emitter configuration. The change in the collector current when the base current changes by 6 mA is
(a) 6 mA
(b) 4.8 mA
(c) 24 mA
(d) 8 mA
View Answer

Ques: In case of NPN-transistors the collector current is always less than the emitter current because
(a) Collector side is reverse biased and emitter side is forward biased
(b) After electrons are lost in the base and only remaining ones reach the collector
(c) Collector side is forward biased and emitter side is reverse biased
(d) Collector being reverse biased attracts less electrons
View Answer

Ques: Which of these is unipolar transistor
(a) Point contact transistor
(b) Field effect transistor
(c) PNP transistor
(d) None of these
View Answer

Related: PPMET Biology MCQ

Ques: In NPN transistor the collector current is 10 mA. If 90% of electrons emitted reach the collector, then
(a) Emitter current will be 9 mA
(b) Emitter current will be 11.1 mA
(c) Base current will be 0.1 mA
(d) Base current will be 0.01 mA
View Answer

Ques: When NPN transistor is used as an amplifier?
(a) Electrons move from base to emitter
(b) Electrons move from emitter to base
(c) Electrons moves from base to emitter
(d) Holes moves from base to emitter
View Answer

Ques: Consider an NPN transistor amplifier in common-emitter configuration. The current gain of the transistor is 100. If the collector current changes by 1 mA, what will be the change in emitter current
(a) 1.1 mA
(b) 1.01 mA
(c) 0.01 mA
(d) 10 mA
View Answer