Electrical Engineering Answers

Design a simple ohmmeter and explain the conditions of the ohmmeter circuit when the terminal to which the unknown resistance is connected "open" and "close".

A voltmeter reads 128.8V when connected across the component if the true value if the voltage is 112.6V calculate
(i) static error
(ii) static correction for the voltmeter
(iii) Relative error.

A voltmeter having a sensitivity of 1200Q/V and read 100V on it's 220V scale when connected across an unknown resistor in series with a milliameter when the millimeter read 5mA calculate
(i) the apparent resistance of the unknown resistor.
(ii) the actual resistance of the unknown resistor.
(iii) the error due to the loading effect of the meter.

Find the unknown resistance AB when the resistance of the remaining arms are BC=120ohms, CD=110ohms, DA=110ohms, AB=?.

A D.C wheatstone bridge has a 5.0V supply connected between A and C and a galvanometer of resistance 50ohms between point B and D what will be the current through the galvanometer when the resistance in the bridge arms are AB=120ohms, BC=120ohms, CD=120ohms, DA=120ohms.

A D.C wheatstone bridge has a 6.0V supply connected between point A and C what will be the potential difference between point B and D when the resistance in the bridge arms are AB 10(ohms), BC(20ohms), CD(60ohms), AD(31ohms)

Determine the z-transform of x(n)= 3Cos2wnSinwn

A single and loss transmission line receives at x=0 a lighting stoke corresponding to a normalized waveform 1.2/50µs. that is an impulse current from a perfect current source with
io(t)=Io(exp(-v/τ2)-exp(-t/τ1)).The line is open at the final end ,that is at x=l,the resistances R1 is infinite. let us call τ=l/u0 the travel time (forward or backward) along the line.
a) Both time constant are associated with the raising and decreasing phases of the lightning stock.which of them is associated to the raising step and what is its value?Idem for the one associated to the falling step?

0.05m^3 of a gas at 6.9 bar expand reversibly in a cylinder behind a piston according to the law of pv^1.2=constant until the volume is 0.08m^3. Calculate the workdone by the gas and sketch the process on p-v diagram.

DC series motor has 3.5 ohm resistance in starter, no load current of 0.3 amps and a full load current of 2 amps rotating at 1800 RPM find speed at full load?