Test bank

1)- What is x[n]? x(t) = 5 cos (25 π t + π /4) with Fs = 10 samples/sec

2)- How are Ts and fs related?

3)- What is the definition of the z-transform?

4)- What the poles and zeros of this function?

The resistance of a starter for a 200-V, shunt motor is such that maximum starting current is 30 A. When the current has decreased to 24 A, the starter arm is moved from the first to the second stud. Calculate the resistance between these two studs if the maximum current in the second stud is 34 A. The armature resistance of the motor is 0.4 Ω.

ANSWER [1.334 Ω]

sir how can we find the tourier transform of the sawtooth wave limits -infinite to +infinite

Reconstruct the original signal with a higher order low pass filter. Which Sampling method (Natural, Flat-top, Sample-and-hold) can be easy to reconstruct the signal? Explain your observations.

A three phase synchronous motor is Y-connected with the following values: 2.3 kV, 400 hp, 60 Hz, 8 poles with a rated pf of 0.85 leading. It is 90% efficient at full load with an armature resistance of 0.80 Ohms and synchronous reactance of 11 Ohms. At full load calculate the output torque, and internal generated voltage (E_A)

A train runs between 2 stations, 2 km apart at a average speed of 40kmph. The train is made to run according to the quadrilateral speed time curve. If the max speed is to be limited to 60 kmph, acceleration to 2 kmphps, coasting retardation to 0.15 kmphps and the braking retardation to 3 kmphps. Determine the duration of acceleration, coasting and braking.                                  

3. For the following analog signal:
x_a(t) = 3sin(40πt) + 3cos(50πt)
which is sampled at a rate of 100 samples/second.

a. Design an IIR digital filter that will pass the first component 3sin(40πt) with attenuation of
less than 1 dB and suppress the second component 3cos(50πt) at least 50 dB. The filter should be
monotonic in the passband and have ripple in the stopband.

b. Generate 500 samples of the sampled signal x_a(t) at the given sampling rate and use the
filter you designed to process the sampled signal using MATLAB’s "filter" command.

c. Plot the original signal and the output signal in one window using MATLAB’s subplot
command ( in either a 1 X 2 arrangement or a 2 X 1 arrangement. Remember to title all plots and
label all axes.

Please include Matlab code. EVEN JUST PART A HELPS

Please show me in pictures how to use microphone and speaker using Multism, it didn't work when I try, how to get an output?

what is the main difference between voltage source and voltage load? use sketches where suitable.

Using two SN74LS169 modules to build an 8-bit binary UP/DOWN counter.

1. Show the block diagram of your design

Consider a home theater system consisting of a television set, a receiver, a DVD player, and speakers. Draw a system diagram for this system. Include both components and links.What are the inputs to this system? What are the outputs? (Remember that the DVD player and receiver are both components within the system). Now draw a system diagram for the receiver subsystem. Include both its primary components and the links between them. What are the inputs and outputs for the receiver subsystem?

Do these inputs and outputs confirm to the links connected to the receiver in your system diagram?

QUESTIONS AND PROBLEMS

1. Discuss the undesirable results when transformers are operated in parallel without satisfying the required conditions.

2. What will happen to transformers with different kVA ratings connected in parallel? And what are the conditions needed to be satisfied in order to do this.

3. What are the advantages and disadvantages of having transformers connected in parallel in comparison to having one single transformer catering the entire load of the system?

Draw the circuit required to obtain the characteristic current voltage curve of the common emitter NPN silicon transistor. Show how this circuit works. Draw the voltage sources in the circuit, potential disconnectors, current lines, voltage drops measurement devices, circuit elements.

Draw the circuit diagram of differential instrumentation amplifier and derive the expression of its output. Precisely control of temperature in many industries is critical to ensure the quality of the product. Discuss how you will use the instrumentation amplifier using transducer bridge to measure the temperature. Use block diagram to illustrate your concept.