University of Bedfordshire
Find the equivalent resistor (R total) for the network presented in Figure 1A.
Figure 1A [5 Marks]
= R3 +R4+ R3
Req= R2 + Req
=1/2 + 1/7
Req= 9/14 +4
Req = 4.64
You have been given a task to select a sensor; name four different selection criteria for your sensor selection, briefly explain two of them.
Using a simple diagram, briefly explain the speed- torque relation for a DC motor.
DC motors are relatively simple machines.
When supply voltage is constant, the Torque T is inversely proportional to speed W.
For the circuit presented in Figure 2A, find the current I and ð‘‰ð‘œ, if the diode is a silicon type
( ð‘‰ð· = 0.7 ð‘£ð‘œð‘™ð‘¡ð‘ )
Vd = 0.7V
I = V1R1 - V2R2
=9.6 - 3.29
V = Vin - Vg
=8 - 6
Overall transfer function for a control system is given by: T(ð‘ ) = 3
ð‘ 2+8ð‘ +3
Considering the damping factor, which type of the system, this transfer function demonstrates?
T(s)= 3/ s2+8s+3
T(s) =8/2 =4
1.Find the total current and the total power dissipated in circuit of Figure
1. Figure 2B presents a bridge circuit to measure the If Rsensor is 650 â„¦, calculate the ð‘‰ð‘œð‘¢ð‘¡ð‘ð‘¢ð‘¡.
1. For the network of Figure 3B,
a. write the mathematical expressions for the current ð‘–ð¿ and the voltage ð‘‰ð¿ following the closing of the switch.
b. How long does it take for the ð‘–ð¿ to reach its maximum level?
a. Find the equivalent capacitor between terminal A and B in Figure If a voltage of 40 V is applied across the terminal AB, calculate the energy stored in equivalent capacitor in Joules.