Q. In a combination limiter with sinusoidal input voltage the output wave can be nearly square.

View solution

Q. Assertion (A): A Darlington amplifier has very low output impedance

Reason (R): The circuit has a low resistance RE between emitter and ground

View solution

Q. A Hartley oscillator uses

View solution

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

View solution

Q. A delay equalizer is a

View solution

Q. A cascade amplifier stage is equivalent to

View solution

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

View solution

Q. The disadvantage of transformer coupling in amplifier is

View solution

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

View solution

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

View solution

Q. A Wien bridge oscillator uses

View solution

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

View solution

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

View solution

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

View solution

Q. A class C amplifier uses

View solution

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?

View solution

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

View solution

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

View solution

Q. High frequency oscillations can be caused by

View solution

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?

View solution