1) Determine the frequency deviation and modulation index for an FM modulator with 8Hz / mV frequency sensitivity to which a modulating tone equal to 5Cos (2π5000t) has been applied.

select an answer:

a. 20 Hz, 16

b. 40 KHz, 8

c. 40 Hz, 8

d. 20 KHz, 16

e. None of the above

Given the following statements, which describe best an object with increasing kinetic energy? I. A ball dropped from 10 meters II. A ball thrown vertically upwards III. A tennis ball rolling across the court

A: draw the scheme of nuclear reactor and explain the duty of control rods
B: what is the main components of overhead transmission line (explain briefly)

Create a circuit that allows the client to add numbers one by one into a register file (8 four-bit registers) by inputting:

1) the number itsself

2) the memory location

The circuit can be logic gates OR verilog code. whichever you prefer!

Thank you and I will rate!

Using a general Op-Amp 741, design a first order and a second-order low-pass filter with cut off frequent of 5kHz. Subject sinusoidal inputs with frequency from 1kHz to 10kHz and plot the frequency responses for both the filters and provide your opinion.

Classify the following system with output current given (by the equation below) as linear/non linear

i0(t)= 5 i1(t) + 8 i2 (t-10) + 0.25 i3 (t+2)

Is this linear or non linear

Design a mealy machine that generates the output Z=1 when it detects an even number of 1s and odd number of zeros. Draw the state table and circuit diagram for it with D flipflops.

Example of input is 00101

Example of output is 10011

Create a 4 bit register and explain how it works

2. A sequential circuit has two pulse inputs, x1 and x2. The output of the circuit becomes 1 whenever the pulse sequence x1x1x2x2x2x1 is detected. The output then remains 1 for all subsequent x1 pulses until an x2 pulse occurs.

(a) Derive a minimal state table describing the circuit operation. (Here you need to define the states and then perform state reduction).

(b) Synthesize the circuit using SR latches in the master rank. (Here, you need to make state assignment, generate excitation table and then perform logic minimization)

An analog signal has a constant magnitude spectrum upto 4KHz. After 4KHz, the spectrum attenuates at 15dB/octave. Sketch the spectrum.

a. Case 1:The signal goes through a system with an ideal anti aliasing LP filter, with sampling rate at 8KHz. Sketch the spectrum of the signal after passing it through such a filter. Use kHz at the unit of x axis. Note the periodicity and conjugate symmetry of the spectrum.

b. Case 2: There is no anti aliasing filter, so we decide to sample at 12KHz. Sketch the spectrum and mark the amount of aliasing by shading the area. Use kHz at the unit of x axis. Note the periodicity and conjugate symmetry of the spectrum.

c. In case 2, we wish to suppress the aliased components (between 4k and 6k) by more than 50 dB. What should the maximum attenuation level at the edge of stop band be for such a filter?

Describe briefly the relationship between the HVAC systems and IAQ.

Briefly describe the use of cascade control and its main benefits.

Use your knowledge of timers or timing mechanisms with the Do-More PLC Designer & Simulator to create Pulse Width Modulation (PWM) circuits. Trigger the following outputs:

a)Y0 with a duty cycle of 25%

b)Y1 with a duty cycle of 50%

a) Give TWO (2) types of rotor in synchronous machine and describe the differences of these two rotors.

b) A three-phase 11kV, 12 MVA, 50 Hz, 4 poles, Y-connected, 0.9 power factor lagging synchronous generator has a synchronous reactance and armature resistance of 0.05 Ω and 0.4 Ω per phase respectively. Under full load condition, the friction and windage losses are 60 kW and the core losess are 39 kW. Determine:

i) The generator speed at no-load condition in rpm

ii) The magnitude of the phase and line current

iii) The internal emf generated and power angle

iv) The voltage regulation

v) The maximum power and converted torque