Week -2

1.Make a Simulink model of Doorbell using solenoid block with the following details

ANS:-

Graph 1: Doorbell Input/output

• In the above Graph 1, giving input as time period - 2 secs in the Pulse generator to open and close the switch. When the switch is closed the Solenoid block receives electrical power from the battery and plunger moves from port R to port C to hit the bell and producing sound.
• Physical movement of the Plunger is observed by using Ideal Translational motion sensor and physical output is converted into simulink output model is displayed in the scope.By reducing the spring constant value and increasing the damping value vibrations will be reduced.

2. Use a thermistor to sense the temperature of a heater & turn on or turn off the fan as per the below conditions:

ANS:-

Graph 2:Thermistor Input/Output

• In graph 2, for 0-10 secs fan is in OFF condition, because temperature is 293K which is below 298K. After 10 secs temperature goes to 300K, so fan will turn ON, because temperature exceeds 298K. After 30 secs fan will turn OFF because temperature goes to 296K which is below 298K.