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Transistors and Amplifiers for NEET: 32 solved questions

Real NEET paper questions on transistors and amplifiers, part of semiconductor electronics. Each opens with the options, the correct answer and a step-by-step solution. Papers run from 1989 to 2023. No sign-in needed to read them.

What this topic asks

• Transistor currents and current gain — 9 questions
• Amplifier gain and phase — 9 questions
• Transistor structure and action — 8 questions
• Vacuum tubes and triode amplifier — 4 questions
• Feedback and oscillators — 2 questions

All 32 questions with solutions

• The figure shows the circuit symbol of a transistor. Select the correct statements given below: (A) The trans… NEET 2023 (mpr)
• The collector current in a common base amplifier using an n-p-n transistor is 24 mA. If 80% of the electrons… NEET 2022 (Re-exam)
• For transistor action, which of the following statements is correct? NEET 2020
• In the circuit shown in the figure, the input voltage Vᵢ is 20 V, V_BE=0 and V_CE=0. The values of I_B, I_C a… NEET 2018
• In a common emitter transistor amplifier the audio signal voltage across the collector is 3 V. The resistance… NEET 2017
• An n-p-n transistor is connected in common emitter configuration in a given amplifier. A load resistance of 8… NEET 2016 (Phase I)
• For a CE transistor amplifier, the audio signal voltage across the collector resistance of 2 kΩ is 4 V. If th… NEET 2016 (Phase II)
• The input signal given to a CE amplifier having a voltage gain of 150 is Vᵢ=2 cos (15t+π/3). The correspondin… NEET 2015
• In a common emitter (CE) amplifier having a voltage gain G, the transistor used has transconductance 0.03 mho… NEET 2013
• One way in which the operation of an n-p-n transistor differs from that of a p-n-p transistor is NEET Karnataka 2013
• In a CE transistor amplifier, the audio signal voltage across the collector resistance of 2 kΩ is 2 V. If the… NEET 2012
• The input resistance of a silicon transistor is 100 Ω. The base current is changed by 40 μA, which results in… NEET 2012 (Mains)
• A transistor is operated in common emitter configuration at V_C=2 V such that a change in the base current fr… NEET 2011
• A common emitter amplifier has a voltage gain of 50, an input impedance of 100 Ω and an output impedance of 2… NEET 2010
• For transistor action: (1) Base, emitter and collector regions should have similar size and doping concentrat… NEET 2010 (Mains)
• A transistor is operated in common-emitter configuration at V_C=2 V such that a change in the base current fr… NEET 2009
• The voltage gain of an amplifier with 9% negative feedback is 10. The voltage gain without feedback will be NEET 2008
• A transistor is operated in common emitter configuration at a constant collector voltage V_C=1.5 V such that… NEET 2006
• A n-p-n transistor conducts when CBSE AIPMT 2003
• For a transistor (I_C)/(I_E)=0.96, then current gain for common emitter is CBSE AIPMT 2002
• For a common base circuit if (I_C)/(I_E)=0.98 then current gain for common emitter circuit will be CBSE AIPMT 2001
• The correct relation for α, β for a transistor CBSE AIPMT 2000
• The correct relationship between the two current gains α and β in a transistor is CBSE AIPMT 1997
• When npn transistor is used as an amplifier, then CBSE AIPMT 1996
• When a triode is used as an amplifier, the electrons are emitted by AIPMT 1996
• The part of the transistor which is heavily doped to produce large number of majority carriers is CBSE AIPMT 1993
• For amplification by a triode, the signal to be amplified is given to CBSE AIPMT 1992
• For an electronic valve, the plate current I and plate voltage V in the space charge limited region are relat… CBSE AIPMT 1992
• To use a transistor as an amplifier CBSE AIPMT 1991
• In a common base amplifier the phase difference between the input signal voltage and the output voltage is CBSE AIPMT 1990
• When a triode is used as an amplifier the phase difference between the input signal voltage and the output is CBSE AIPMT 1990
• Radiowaves of constant amplitude can be generated with CBSE AIPMT 1989