Electrical Engineering Answers

1. If R1 is 2.3k ohms, R2 is 560 ohms & R3 is 24h ohms , what is Rt?

2. If V=4v , I=18uA, what is R1?

5. A battery of 9V supplies a current of 1A for 7 min. How much energy is supplied in this time?

Two Electric field vectors E1 and E2 are perpendicular to each other; obtain its base
vectors.

A cast steel frame is to be used as the core of an inductor.
An 800 turn coil is wound on the centre limb of the frame which has two similar outer limbs in parallel with each other.

The frame has the following parameters:

Outer limb: c.s.a. of 2000 mm2 and length of 700mm.

Centre limb: c.s.a of 4000 mm2 and length of 250 mm.
Determine the coil current to set up a flux of 1mwb if a saw-tooth (an air-gap) of 1mm is cut in the centre limb.

The relative permeability of steel is 1000.

derive to show from SNR in power to SNR in voltage

Draw the output waveform indicating proper scales on the time and voltage axes for the given input waveform (Vi) to the circuit shown resistance 10 ohm,60 ohm, amplifier has voltage-12V and output resistance 10kohm,10kohm

Find the complex exponential Fourier series coefficients for:
a. x(t)=3cos(4w0t)
b. x(t)=sin^2(t)
2. Find the DTFT of:
x(n)={1 0<=n<=3
0 otherwise}

A cast steel frame is to be used as the core of an inductor.



An 800 turn coil is wound on the centre limb of the frame which has two similar outer limbs in parallel with each other.

The frame has the following parameters:

Outer limb: c.s.a. of 2000 mm2 and length of 700mm.

Centre limb: c.s.a of 4000 mm2 and length of 250 mm.



Determine the coil current to set up a flux of 1mwb if a saw-tooth (an air-gap) of 1mm is cut in the centre limb.



The relative permeability of steel is 1000.

A PV module has an output rating of 32 volts and 300mA. Do the following:
a) Design a PV array consisting of the PV module mentioned above to supply 250V and 2A to an inverter connected to some load.
b) Find the power produced by each PV module and PV array.
c) If each PV cell in the above mentioned module produces a power of 10mW, find the
number of cells present in the PV module.

A PV module has an output rating of 32 volts and 300mA. Do the following:
a) Design a PV array consisting of the PV module mentioned above to supply 250V and 2A to an inverter connected to some load.
b) Find the power produced by each PV module and PV array.
c) If each PV cell in the above mentioned module produces a power of 10mW, find the
number of cells present in the PV module.