Electrical Engineering Answers

 Draw the phasor diagram and find the sum of the currents: i1=141.42 Sin(t + /2) , i2 

= -70.71 Cos t , i3= 50 ej/3 , i4=100 -2/3 and i5= 50 (Cos /3 + j Sin/3) 

Two impedances Z1 and Z2 are connected in parallel. The first branch takes a leading 

current of 16 A and has a resistance of 5 Ω, while the second branch takes a lagging 

current at 0.8pf. The applied voltage is 100+j200 V and the total power is 5 kW. Find 

branch impedances, total circuit impedance, branch currents and total circuit current.

A parallel plate capacitor has an area of 5.00 cm 2 and a capacitance of 3.50 pF. The 

capacitor is connected to a 12.0 V battery. After the capacitor is completely charged up, the 

battery is removed

a. What must be the separation of the plates and how much energy is stored in the electric 

field between the plates?

b. If a sheet of Mica with εr=3.5 is placed between the plates, how will the voltage across 

the plates and the charge density on the plates change?

c. If the sheet of Mica has an area of 3.00 cm 2 so that it does not cover the whole area of 

the plates, what would be the effective capacitance of this arrangement?

d. If the Mica sheet is removed and the plates are moved 1.00 mm farther from each other, 

what will be the voltage between the plates, and how much work will it take to move the 

plates apart?

A parallel plate capacitor has an area of 5.00 cm 2 and a capacitance of 3.50 pF. The 

capacitor is connected to a 12.0 V battery. After the capacitor is completely charged up, the 

battery is removed

a. What must be the separation of the plates and how much energy is stored in the electric 

field between the plates?

b. If a sheet of Mica with εr=3.5 is placed between the plates, how will the voltage across 

the plates and the charge density on the plates change?

c. If the sheet of Mica has an area of 3.00 cm 2 so that it does not cover the whole area of 

the plates, what would be the effective capacitance of this arrangement?

d. If the Mica sheet is removed and the plates are moved 1.00 mm farther from each other, 

what will be the voltage between the plates, and how much work will it take to move the 

plates apart?

A parallel plate capacitor has an area of 5.00 cm 2 and a capacitance of 3.50 pF. The 

capacitor is connected to a 12.0 V battery. After the capacitor is completely charged up, the 

battery is removed

a. What must be the separation of the plates and how much energy is stored in the electric 

field between the plates?

:Simplify the boolean function F=A’B’C’ + B’CD’ + A’BCD’ + AB’C’ using K-map.

 A code 10110 need to be send to the receiver.Using Hamming code find out the code word and the mechanism to check the corrected data.(Assumption:use odd parity)

:Perform following arithmatic operation. (a) (00010110)BCD + (00010101)BCD (b) (4562)8 + (3245)8 

:Solve the following using 2’s complement representaion method. (a) 1010100 - 1000100 (b) 1011100- 11100101 

Draw the phasor diagram and find the sum of the currents: i1=141.42 Sin(ωt + /2) , i2 = -70.71 Cosωt , i3= 50 e^jπ/3 , i4=100 -2π/3 and i5= 50 (Cos π/3 + j Sinπ/3)