Electrical Engineering Answers

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)

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Given v1(t)=10sin(270t)V,R1=280Ω,L1=4.5H.
Derive the complete solution for i(t) for t≥0:

i(t) =???
Hint: The particular solution is of the form Acos(270t)+Bsin(270t).

In a linear series plate modulated amplifier, the plate supply vottage is 300V and the D.C plate current under unmodulated condition is 20A, the sinusoidal modulating voltage which appears in the plate current of modulated complifier has amplitude of 150V and the unmodulated output Carrier power is 4.5KW, find;
(i) modulation index
(ii) plate current efficiency
(iii) Carrier power under modulated condition
(iv) plate dissipation under unmodulated and modulated conditions

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.

Future value of initial cost (consider 10 years) of no-star geyser (in Rs.)
Let’s make the problem related to the choice of geyser that we had discussed over the last assignment a little more realistic by
introducing a discount rate. So, the problem here is as follows. Suppose, you want to buy a 10-litre water geyser. You have an option
to buy either a 5 star or a no-star model and you have the following information.

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?

A potentiometer wire of length 100cm has a resistance of 10Ω. It is connected in series to to a
resistance R and a cell of emf 2V and negligible internal resistance. A source of emf of 10mV is
balanced by a length of 40cm of the potentiometer wire. What is the value of the resistance R?
A.526.67 ohm
B.70 ohm
C.1580 ohm
D.zero ohm

Find speed of generator when it has 7.5kw, 20 Amps, B = 0.8w/m2, length = 150mm, diameter 200mm, there are 600 conductors at 65 % below the pole.

I just don't understand the 65% below the pole. Does it relate to phase angle or power factor somehow?