Without any any input signal a feedback oscillator gives output signal. Explain how the conservation of energy is not violated.

Given a brief description of LC feedback oscillator. What is the source of its input signal ? What is the frequency of its output signal ?

When an input signal 1 is applied to a NOT gate. What will be its output?

In a transistor the value of beta =200. In CE configuration it is kept in a stable dc bias. Now if an input signal is applied then output signal will vary in the range of 5.6 mA to 6.4 mA. Find the amplitude of the input signal ( in mu A).

Statement I : The frequency of the output signal from a feedback oscillator depends on its feedback ratio. Statement II : A feedback oscillator circuit is made in such a way that the closed loop gain of the amplifier reaches to an infinite value.

Statement I : In CE mode of a transistor if the input signal is applied at base then the output signal is obtained at collector. Statement II : In a transistor most of the emitter current is transformed into the collector current.

Give example of an acidic and an alkaline buffer solution. Explain the buffer action of any one of the solutions.

How any 4-letters words, with or without meaning, can be formed out of the letters in the word LOGARITHMS, if repetition of letters is not allowed?

with respect to any data signal, the frequency of a carrier wave is much _____.

Electromagnetic waves propagate through free space or a medium as transverse waves. The electric and magnetic fields are perpendicular to each other as well as perpendicular to the direction of propagation of waves at each point. In the direction of wave propagation, electric field vecE and magnetic field vecB form a right-handed cartesian coordinate system. During the propagation of electromagnetic wave, total energy of electromagnetic wave is distributed equally between electric and magnetic fields. Since in_0 and mu_0 are permittivity and permeability of free space, the velocity of electromagnetic wave, c=(in_0 mu_0)^(-1//2) . Energy density i.e., energy in unit volume due to electric field at any point, u_E=1/2in_0E^2 Similarly, energy density due to magnetic field , u_M=1/(2mu_0)B^2 . If the electromagnetic wave propagates along x-direction, then the equations of electric and magnetic field are respectively. E=E_0sin(omegat-kx) and B=B_0sin(omegat-kx) Here, the frequency and the wavelength of oscillating electric and magnetic fields are f=omega/(2pi) and lambda=(2pi)/k respectively. Thus E_"rms"=E_0/sqrt2 and B_"rms"=B_0/sqrt2 , where E_0/B_0=c . Therefore, average energy density baru_E=1/2in_0E_"rms"^2 and baru_M=1/(2mu_0)B_"rms"^2 . The intensity of the electromagnetic wave at a point, I=cbaru=c(baru_E+baru_B) . To answer the following questions , we assume that in case of propagation of electromagnetic wave through free space, c=3xx10^8 m.s^(-1) and mu_0=4pixx10^(-7) H.m^(-1) If the peak value of electric field at a point in electromagnetic wave is 15 V . m^(-1) , then average electrical energy density (in j . m^(-3) )