Q. A silicon PN junction diode under reverse bias has depletion region of width 10 μm. The relative permittivity of silicon, Ɛr = 11.7 and the permittivity of free space Ɛ₀ = 8.85 x 10¯¹² F/m. The depletion capacitance of the diode per square meter is

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Q. A delay equalizer is a

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Q. A cascade amplifier stage is equivalent to

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Q. Which one of the following devices is not used as the controller in a stabilizer?

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Q. The disadvantage of transformer coupling in amplifier is

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Q. A transistor is said to be in a quiescent state when

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Q. According to Barkhausen criteria in order to sustain the oscillations

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Q. A Wien bridge oscillator uses

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Q. In the above case, what will be the value of capacitor to obtain 100 kHz frequency?

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Q. Equal amplitude ac signals are given as inputs to both inverting and given as inputs to both inverting and non-inverting terminals of an op-amp. The output will be zero when the phase difference between inputs is

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Q. Which of the following can be used to isolate a low impedance from a high impedance source?

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Q. A class C amplifier uses

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Q. A three-section RC phase shift oscillator has R = 10K ohms and C = 0.001 μF. If the oscillator is to be made variable using the same value of R, what should be the value of capacitor to obtain a frequency if 1 kHz?

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Q. The input to negative clamper has a peak value of Vp. Then in the output the positive and negative peaks are nearly

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Q. In a common Emitter BJT amplifier, the maximum usable supply voltage is limited by

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Q. High frequency oscillations can be caused by

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Q. A feedback network to be used with an amplifier to provide oscillation is tested and found to give an output of 0.124 V with a 0.5 V input. What will be the effect on output if the amplifier's gain is twice that required by the Barkhausen criterion?

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Q. A transistor in CE mode is in saturation region. Then the collector is almost at

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Q. The semi-conductor type 2 N 34 indicates

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Q. The emitter bias largely depends on

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