# Electronic Devices and Circuits-4

Physics Electronic Devices and Circuits-4 Multiple Choice Question Answers for all competitive exams Preparation for NEEET / JEE and KEA Preparation.

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Electronic Devices and Circuits 4

TEST YOUR KNOWLEDGE OF SCIENCE

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Q31)    What would happen, if the signal Xd  passes through the feedback network?

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Q32)    Consider a single stage CE amplifier is estimated to possess the bandwidth of about 2MHz in addition to the resistive load of 500 ohm. What should be the value of source resistance in order to get the required bandwidth for the hybrid π equivalent circuit in accordance to the transistor assumptions given below?  hfe = 100, gm = 30 mA , r'bb = 80Ω, Cc = 3pF, fT = 200MHz, Ce = 20pF, fH = 5MHz, r' be = 2kΩ

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Q33)   What should be the value of unity gain frequency for a short circuit CE transistor with gain of 30 at 4MHz and cut-off frequency of about 100 kHz?

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Q34)  Miller's theorem is applicable in a single stage CE hybrid π model in order to deal with ________

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Q35)   Which capacitors assists in preventing the loss of gain due to negative feedback without affecting the DC stability of R-C Coupled amplifier?

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Q36)   Which among the following is not an advantage of RC coupled amplifiers?

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Q37)   Which among the below mentioned circuits resemble its behaviour similar to that of an amplifier in high frequency region, as the response decreases with an increase in frequency?

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Q38)   Why is the Darlington configuration not suitable for more than two transistors?

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Q39)   What should be the value of resistance between collector and ground (R0) for below drawn schematic of transistor amplifier, comprising h-parameters as hie = 1.1 kΩ, hfe = 50, hre= hoe = 0 with short-circuit capacitors?

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Q40)  Consider the assertions given below.

A. Replacement of each coupling and bypass capacitors by a short circuit
B. Replacement of transistor by its hybrid equivalent model for further analysis
C. Replacement of DC voltage sources by a short circuit

Which is the correct sequential order of steps to be carried out for analysis of a transistor amplifier circuit?