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542 questions
Derive the expression for overall noise figure of a cascaded system.
The noise facto can be expressed in term of decibels. The representation of noise factor in decibel is known as noise figure.
The noise figure
What is angle modulation?
In exponential modulation the angle of the carrier is varied in according with the baseband signal. For this reason, exponential modulation is also referred to as angle modulation.
Derive the relationship between modulation index and modulated signal amplitude for sinusoidally modulated DSB-TC signal
Let the modulated AM signal
State and prove maximum power transfer theorem
The theorem states that a networks delivers maximum power to a resistive load connected across a voltage source when the load resistance is equal to the internal resistance of the voltage source as seen from the output terminals by removing the source and replacing the same by its internal resistance.
Compare electric and magnetic circuits with respect to their similarity and dissimilarities.
The similarity between electric and magnetic circuit is given in table 1
What is resonance? Deduce the expression of frequency in a series RLC circuit and parallel RLC circuit at resonance.
In general , the resonance means a particular situation in a physical system where a sinusoidal force having a constant amplitude gives rise to an enhanced response of maximum amplitude varying with time.
Explain what are meant by phase and phase difference of sinusoidal waves..
Phase of an alternating quantity at any instant is the time that has elapsed since the instantaneous value of the quantity assumed zero value was going from negative to positive direction.
Draw a mathematical expression for RMS value of a sinusoidal voltage
Let us determine the RMS value of a sinusoidally varying current, i(t) flowing through a resistance R. At any instant of time the heat generated of power dissipated in the resistance is
A network of resistances is formed as shown in Fig.14. Compute the resistance between the points A and B.
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Fig. 14(a)
The star connection by the resistors
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