Electrical Engineering Answers

Design a system that will determine the speed depending ambient temperature. The display should show the current temperature and fan speed.

(Digital ): This unit will determine the speed of the motor.

• Measure the ambient temperature and determine the whether the fan should spin at high(220v),medium (150v) or low speed high (80v). Send an analogue signal for the speed to the Motor Driver unit. 220, 150 and 80 volts are recommended levels.

• Allow the user to set the temperature bounds digitally for the speed settings.

•Send the current temperature value to the Speed Measurement unit.

A PCB design should be done with proteus. Show the coding and diagrams.

A DC generator has 136 conductors in series. Each has an effective length of 15 cm, is constrained to move in a circular path of radius 12cm and lies in a uniform Field flux density 1.2 Tesla.

Calculate the emf generated when armature rotates at 1400 rpm

b) A coil of 2500 turns has a flux of 10mWb linking with it when carrying a current of 2A.

Calculate the coil inductance and the emf induced in the coil when the current collapses to zero in 20 ms

Find ln z when z equals

1. -11

2. 4+4i

3. 4-4i

4. 1 +- i

5. 0.6 + 0.8i

6. -15 +- 0.1i

7. ei

Find e^z in the form u + iv and |e^z| if z equals.

1. 3+4i

2. 2πi(1+i)

3. 0.6-1.8i

4. 2 + 3πi

5. 11πi/2

6. √2 + 1/2πi

1.1. Design a PI controller to drive the step response error to zero for the unity feedback system where, 𝐺(𝑆) = 𝐾 (𝑆+1)(𝑆+3)(𝑆+10) The system operates with a damping ratio of 0.5. 

Question 3 (GA5) 2.2. Identify and realise the G(s) controller with operational amplifiers. 𝐺(𝑆) = 𝑠 + 2 [10]

Find sum of minterms and product of maxterms from: A'BC + AB'C + ABC' + ABC

Equal charge of electrons are placed in two spheres 3 cm apart in air. If the resultant force is 4kN,

how many electrons does each spheres contain?