Electrical Engineering Answers

The summer you have designed has four input lines with R1=1, R2=1/2, R3=1/4, R4=1/8and Rf=1, all values given in kΩ. The input lines are set at 0 or 1v. Find V0 in terms of the following set of input values V4=1, V3=0, V2=0 and V1=1

i. A computer manufacturing company has approached you to assist it to design a summer circuit for its new type of computers. You are provided with resistors R1, R2, R3, R4 and a feedback resistor Rf. Design and draw the summer circuit

ii. Derive the formula for the output voltage Vo of the summer

 A series R L circuit is connected to a 110V ac source. If the voltage across the resistor is 85 V, find the power dissipated in the circuit

. Find the impedance of the circuit if supply voltage is v(t)= 110sin(20t+30 ) +220 cos(20t- 90 )V and the current i(t) =30cos(20t +60 ) -20sin(20t+ 60 )A

Design an op-amp based integrator with a time constant of 

1 second, if the capacitor is 1µF. If a constant voltage 

of -1V is applied at t=0 seconds, how long will it take to an output of +10V (assume initial capacitor voltage 

= -10V). Sketch the input and output waveforms.

Find the impedance of the circuit if supply voltage is V(t)=110sin (20t+30)+220cos(20t-90)v and the current i(t)=30cos(20t+60)-20sin(20t+60)A

In Fig. 21-24, the particles have charges q1
q2
100 nC

and q3
q4
200 nC, and distance a
5.0 cm. What are the (a) x

and (b) y components of the net electrostatic force on particle 3?

A series R L circuit is connected to a 110V ac source. If the voltage across the resistor is 85 V, find the power dissipated in the circuit .

A capacitance is made of two parallel conducting plates as shown in the figure and the distance between the plates is 'd'. (i) write the value of capacitance as a function of all the possible dimensions from L,W, h and d (ii) if a dielectric slab of thickness 't' and area of cross-section A (t<d), and relative permittivity Er is inserted in between the plates, what will be the value of capacitance (i) If a voltage V is applied between the plates, find the voltage across various sections (iv) If the dielectric slab is of length L/2 and width 'W and relative permittivity Er and is inserted in between the plates from right end, what is the value of capacitance.

2. Explain the effects of thermal shock on the behaviour and properties of ceramics

• You should identify specific applications to describe the effects on the ceramic.

• Use relevant diagrams to support your findings.

• Write at least 500 words.