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Electrical Engineering

Based on Figure 2(c), using Delta-Star transformation, calculate resistance RT and total current,

IT for circuit below.(5 marks)

Figure 1(c)

Electrical Engineering

A spacecraft takes 200 km after being launched to reach the escape speed from the earth of 11.2km/s. Find the average acceleration in terms of g

Electrical Engineering

A battery delivers 10 joules of energy to move 5 coulumbs of charge. What is the electromotive force between the terminals of the battery?

Electrical Engineering

A generating station consists of two 100 MVA generators with 6%

reactance each and one 150 MVA generator with 8% reactance as shown

in Figure below. These generators are connected to a common bus bar

from which loads are taken through a number of 50 MVA, step up

transformers each having 5% reactance. Compute the rating of circuit

breaker on (i) low voltage side and (ii) on high voltage side.

Electrical Engineering

3. For the magnetic circuit shown in figure 21.19 the reluctance of the central limb (PS) is 10 × 105 AT/Wb and the reluctance of the outer limbs (PTS and PQS) are same and equal to 15 × 105 AT/Wb. To produce 0.5 mWb in PQS, the mmf to be produced by the coil is: (A) 750 AT (B) 1750 AT (C) 250 AT (D) 1500 AT.

Electrical Engineering

The potential difference between a certain thundercloud and the ground is 7MVolts. Find the energy dissipated when a charge of 50 Coul is transferred from the clouds to the ground in a lightning stroke

Electrical Engineering

minimized the following boolean expression using K-map and boolean algebra. Draw the schematic diagram of the minimized expression. X= A’B’C’D+ A’B’C’D+A’BC’D

Electrical Engineering

A resistive coil draws 2A at 110 V after operating for a long time. If the temperature rise is 55°C above the ambient temperature of 20°C, calculate the external resistance which must be initially connected in series with the coil to limit the current to 2A. The temperature coefficient of the material of the coil is 0.0043 per °C at 20°C.

Electrical Engineering

You have a RC circuit which contains a capacitor of 0.02 F and a resistor of 350 Ohm. Calculate how

long it would take (in seconds) for the capacitor to be charged to 89% of its full voltage.

Electrical Engineering

when does a signal is said to be valid or invalid?