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(a) A chopper controlled electric train is powered from a 1500 VDE supply. The power semi- conductor switch element hasaminimum effectice ON time of 40 Ms. during starting and slowspeed running, the output of the chopper has to go as low as 15 V. what is the highest chopper frequency possible to satisfy thisreqirement ?
(b) The chopper in (a) has a minimum effective OFF time of 30 Ms.The chapper frequency is 2000Hz(i) what is the maximum duty cycle and maximum output voltagepossible?(ii) if the full input voltage is to be made available to theload, show how this can be done
The machine takes three inputs in addition to the clock: countup, countdown, reset. The count advances by 1 when countup=1, decreases by 1 when countdown=1, and goes to 0 when reset=1. The output o1=1 when the count reaches 3.
Write a balance reaction equation for the complete combution of carbon in air. What are the mass and mole fraction of fuel, air oxygen and notrogen in the reactants
A combinational logic circuit has 18 binary inputs. Assuming it takes 50 ms to input one test pattern and record the circuit's output, how long will it take to do an exhaustive test
Suppose your multimeter is fused for 300 mA. You want to measure current through a resistor via a 9-volt battery. What is the minimum resistance such that the current is less than 150 mA
suppose that you have a balanced stereo signal in which the left and right channels have the same voltage amplitude 500 mVpp. This time, however, you want to be able to mix these two channels into a single inverted output
1. Determine Laplace transform of (2-2e^-4t)u(t) 2. Determine if x(t) = 9cos(2t)+4sin(pi t) is periodic; if periodic, calculate the period. 3. Compute the inverse Laplace transform of X(s)= (s+2)/(s^2+ 7s + 12).
A 150-kVA, 2400/240-V single-phase transformer has the following parameters: R1 = 0.2 ; X1 = 0.45 ;R2 = 0.02; X2 = 0.0045 ;Rc = 1000 ; Xm = 1500. The transformer is connected to a 150kVA load with 0.8 power factor lagging.
Water is being heated in a vertical piston-cylinder device. The piston has a mass of 15 kg and a cross-sectional area of 120 cm^2. If local atmospheric pressure is 99.5 kPa, determine the temperature at which the water will start boiling.
A circuit contains a known resistance of 2.4 kO, and an unknown inductance. a) When a 12-V battery is connected, what is the current in the circuit a long time after the switch is closed
Consider the signal x (t) = 10+ 20 cos (100*2 t + 4) + 10 cos (250*2 t ) A. Using Euler's relation, the signal x(t) defined by the above equation can be expressed as a sum of complex exponentials in the form X(t) = x0 + Re{k=1N Xkejk2fot}
(Combinational Integer Multiplier) Draw the schematic for a 3-bit com- binational multiplier designed using partial product accumulation. (A,B are 3-bit inputs and S is a 6-bit output.) Use half/full adders in addi- tion to logic gates to build th..
For a 32 bit CMOS 5 volt microprocessor that has a 32 bit address bus and a separate 32 bit data bus, and the processor has a 1 nS rise time and 0.5 nH of ground inductance on a board made from glass epoxy material.
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