BSNL JE Answer key sept 29 evening

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BSNL JE 2016 answer key

Click Here to submit your questions in BSNL JE EXAM BSNL conducting Junior Engineer exam from september 25 to 29 in 10 batches, so each batch have different set of questions, it is an online exam so there will not be any question papers. here we can discuss the questions and answers for that you …

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Operational amplifier and Opto-electronic devices

Operatinal amplifier Operatinal amplifier or OPAMP are basic element in an analogue  circuit. Opamp is a linear device. When signal is applied to minus terminal of opamp then output is in opposite phase of input. Differential gain of opamp should be greater than common mode gain. Ideal value of common mode rejection ratio CMMR is …

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Feedback amplifier and tuned amplifier

Feedback amplifier Feedback factor varies with frequency, so negative feedback may change to positive and vice versa. OPAMP comparator doesn’t have any feedback. In common emitter amplifier the unbypassed emitter resistance is current series feedback. Voltage negative feedback is used in emitter follower. De-sensitivity factor is defined as the factor with which the feedback desensitizes …

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Sinusoidal oscillators

Simplest sinusoidal variable frequency oscillator is amstrong circuit. Simplest sinusoidal constant frequency oscillator is crystal oscillator. Parasitic oscillation is caused by transistor inter electrode capacitance. If you movie towards an oscillating circuit its frequency increases because of hand capacitance. Frequency stability is maximum in wein bridge oscillator. Practically in order to change frequency of oscillation …

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