Electrical Engineering Answers

The electromotive force of a standard cell is measured with a

potentiometer that gives a reading of 1.3562V. When a 1.0 megaohm

resistor is connected across the standard cell terminals, the

potentiometer reading drops to 1.3560V. What is the internal resistance of the standard cell

what is the circuit open noise voltage across a 100-k resistor over the frequency range of direct current to 20 kHz at room temperature (25°C)? 

Consider a system having a frequency response H(f) as shown in the figure. Find the output signal y(t) and normalized average power of the output if the input signal to system is x(t) = 2 + 4cos(2πt) + 4cos(4πt).

Figure :- https://pasteboard.co/Zpsg6UvZIXnI.png

 An AC circuit consists of a resistance and capacitance connected in series. The result is that

A.

Current lags the voltage by 30 degree

B.

Current lags the voltage by 90 degree

C.

Current leads the voltage by 90 degree

D.

All of the above

 A resistance of 100Ω is connected in series with a 200Ω resistor. What is the phase shift (angle) between voltage and current?

With the aid of suitable diagrams discuss the LAN Topologies available in data

communication

To enable vendors of diverse systems to link and interconnect equipment

via standard interfaces which will intend give room for software and

hardware to segment together well and be suitable on different system is

prime function of a certain system and a model. Discuss your point view on

the above system.

1. What is the open-circuit noise voltage across a 100-kΩ resistor over the frequency range of direct current to 20 kHz at room temperature (25°C)? 

2. The bandwidth of a receiver with a 75-Ω input resistance is 6 MHz. The 

temperature is 29°C. What is the input thermal noise voltage? 

3. What is the average noise power of a device operating at a temperature of 90°F with a bandwidth of 30 kHz?