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1. For a home toaster suggest a closed loop control scheme to control the amount of browning on the toast.
2. Obtain the mathematical model of the OPAMP circuit shown in the Fig.
3. In the Ward-Leonard speed control system shown in Fig. 2, the generator field time constant is negligible. It is driven at constant speed giving a generated voltage of K2 volts/filed amp. The motor is separately excited so as to have a counter emf of Kb volts per rad/sec. It produces a torque of K. newton-m/amp. The motor and its load have a combined moment of inertia J Kg-m2 and negligible friction. The tachometer constant is K, volts per rad/sec and the amplifier gain is KA amps/volt. Draw the block diagram of this system and determine the transfer function co(s)/Ei(s), where w is the load speed.
Given:
J=6 kg-m2 KA=4 A/V
K2=50 V/A Its= lit 1c2=1.5 N-m/A Kt=0.2 V per rad/sec
With the system originally at rest, a control voltage e,=100V is suddenly applied. Write MATLAB code to determine how the load speed will change with time.
Determine the phase relation between V o and i g for the given network if V g = 45sin(317t) and determine v o for the given network
A firm leases land from you for 15 years to build a warehouse. As payment you will own the building after 15 years estimated to be worth $400k however you must pay taxes and maintenance of $15k per year.
Make sure to mark significant points in your figure (amplitude, offset, time, etc.). How could a device be modified to work as an electro-optic phase modulator? If we apply signal V, what is the range of phase shifts induced by this modulator.
Write a C program for a HCS12 microcontroller that writes the value, 0x78, to Memory Location VAR1 and then calls a delay function. The delay function should generate a delay of 0.25 milliseconds.
A pnp power transistor operates with an emitter-to-collector voltage of 5V, an emitter current of 10A, and VEB = 0.85V. For ß = 15, a) What base current is required b) What is the IS for this transistor
A digital communications system is being designed with the goal of transmitting 32 kbits/s over a channel having a bandwidth of 8 kHz. Determine (a) the number of encoding levels required and (b) the minimum signal-to-noise ratio required in the c..
Design a load resistor (resistance rating and power rating) network to have the transformer operate at full load. Design a second network for half load. You may need to combine several resistors to get the desired value.
compute the money saved in one month by using CFL (compact fluorescent light) bulb (18 W) instead of using an incandescent lamp (60 W) if the cost of electricity is $.12 per kWh. Assume lights are used for 10 hours a day. (30 days in the month)
Light of free-space wavelenth lambda_0= 0.87 micrometers is guided by a thin planar film of width d=2 micrometers and refractive index n_1=1.6 surrounded by a medium of refractive index n_2=1.4.
R1=1k ohms, R2=1.5k ohms and R3=3k ohms. Assume an ideal opAmp. Indicate the PEAK current in each of the resistors.
For the closed-loop system with plant model and controller given by G(s) = (s2+81)/(s2(s2 + 100)) D(s) = (K (S+1))/(S+13) (a) Find the locus of the closed-loop roots (poles) with respect to K;
Assuming the bandgap of GaAs, Eg1 = 1.424 eV and that of AiAs, Eg2 = 2.671 eV, find the required AI - fraction x in AIxGa1As compound to fabricate the material for red light emission with the wavelength lambda = 652 nm.
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