Q1A 4-poles, wave wound, 600 conductors DC long shunt generator has the armature, series and shunt resistances are 0.15 ohm, 0.18 ohm and 200 ohm respectively. It runs at 1500 rpm. Calculate the following if it is required supply to the load resistance of 20ohm with flux per pole as 8.33 mWb. Take the Iron and Frictional losses as 550 W.(i)Induced Emf(ii)Terminal Voltage(iii)Output Power(iv)Input Power(v)Efficiency

Q2Write short notes on following characteristics of dc generator(i) Open Circuit Characteristics (OCC)(ii) Load Characteristics

Q3A dc short shunt generator supply 500V to a 20 kW load. Its armature, series and shunt resistance are 0.8 , 0.6 and 700 respectively. Calculate the armature current, induced emf, input power, torque supplied by the prime mover and efficiency if its speed and mechanical losses are 1500 rpm and 910W respectively.

Q4A 500V, 4 poles, wave-wound DC Series Motor has 900 conductors on its armature. It has armature and series field resistance of 0.6, and 0.8respectively. The motor takes a current of 40A. Estimate the speed and gross Torque developed if it has a flux per pole of 20mWb.

Q5A dc shunt motor takes a no load current of 5 A at 300V. Its armature and shunt resistances are 0.45 ohm and 0.68 ohm respectively. Calculate the Constant Loss (Iron and Frictional Loss) of the machine.

Q6A dc series motor operates at 1000 rpm with a line current of 82A from 250V mains. its armature circuit resistance is 0.2and its field resistance is 0.6. Find the speed at which the motor runs at a line current of 65A, assuming that the flux at this current is 33% of the flux at 82A.

Q7A 3 phase, 50Hz, 4 poles induction motor runs at 1440 rpm. Calculate the following i.Synchronous speedii.Slipiii.Slip speediv.Rotor frequency while runningv.Rotor cu loss if mechanical power developed is 16 kW.

Q8A 40 kW (Rated Output), 415V, 50Hz, 3 phase, star connected induction motor has a synchronous speed of 1800 rpm. The full load slip is 4% and full load power factor is 0.9 lagging. Stator Cu losses are 2500 W. Iron losses are 2000W. Rotational losses are 1400 W. Calculate i.Shaft or Net Torque developedii.Mechanical power developediii.Power inputiv.Efficiencyv.Supply current

Q9The following are the equivalent circuit parameters of a 3phase, star connected 415V, 50Hz, 4 poles Induction Motor:R1= 0.5, R'2= 0.4/s , X1= 0.9, X'2= 0.8, Xm= 50,(neglect Ro)Calculate the input impedance, motor current, power input, power supplied to the rotor, power developed and efficiency if its rotational losses are 1200W. It runs at 1410 rpm.

Q10A 415-V, 29.84 kW, 50 Hz, delta-connected 3-phase induction motor gave the following test data:No load test:415V, 15A, 2000 WLocked rotor test:125V, 40A, 4000 WConstruct the circle diagram and determine the line current and power factor for the rated output. Assume stator and rotor Cu losses equal at standstill.Q11With a aid of neat circuit diagram, explain the working principle of Automatic star-delta starter of three phase induction motor

Three Phase Problems

Q1: What are concepts you need to understand for three phase problems?

Q2: When there is two connections, such as Y to Y. Is there a connection of circuit? For example one end of the y connection connected to the other. Will that make

impedance parallel for y connection?

Lab report on **resistor**
Should have Profile or definition and simple steps to analyze the electrical circuit through the resistor and example.
#Please write clearly or work on word.

Consider a Si NPN BJT. Discuss how an change in one of the design parameters affect the emitter injection efficiency, the base transport factor, the common emmiter current gain, and the early voltage. Assume complete ionization. Further assume the carrier mobility and the minority carrier lifetime are independent of the change in design parameters.

(a) Increase emitter doping
(b) Increase base doping
(c) Increase base width
(d) Increase collector doping

Give three features of the differential pair circuit in IC analog design

Determine the Field Enhancement Factor (FEF) for the following dimensions.

A) Cylinder Plane, d=3cm, x=12cm

B) Sphere Plane, d=2cm, x=8cm

1. With regards to electrical noise and inductive coupling, explain the purpose of running current carrying conductors in their own raceway separate from signaling cables. Does the type of raceway material, ferrous vs non-ferrous make difference?

2. When it comes to load switching on power systems, transients are unavoidable. Discuss how switching on and off inductive and capacitive loads contribute to this problem.

3. List two materials commonly used in TVSS (Transient Voltage Surge Suppressors). As well,

UL 1449 uses 3 categories when rating Surge Protective Devices (SPD) / Transient Voltage Surge Suppressors (TVSS). List the categories and explain how they apply to a TVSS’s performance.

4. In the case of the vibrating transformer, discuss the following;

• detection method used to find the problem,
• the problem itself,
• what can be repaired on the transformer or external equipment to prevent the vibrating and buzzing noise?

Please answer the bleow question (typing but not handwriting):

In the industries, Y-∆ starter is usually used to start the induction
motors. What is the significance of using Y-∆ starter?

1. IN C LANGUAGE: Write a code that makes the MSP430 blink the red LED and the green LED at the same time. The two LEDs should be on at the same time and then off at the same time

. Create a half adder circuit using ladder logic. Use an input module to collect the values from two switches A0 and B0 and an output module to deliver the output Sum and Carry signals to bulbs. Use a ladder diagram to create the logic. You should be able to alter the switches and check the operation of your logic by checking which bulbs come on. You can’t use the logic convertor for ladder logic diagrams. Show your circuit, and then the four diagrams showing which bulbs are on for the four input combinations.

a) Let ?(?) = cos(2??) and ?(?) = cos(20??). Write the mathematical expression for the Fourier transform of ?(?) = 4[1 + 0.5?(?)]?(?) as a function of both ? (rad/s) and ? (Hz) by hand. Moreover, plot the magnitude spectrum of ?(?) by hand as functions of both ? (rad/s) and ? (Hz).

b) By using a 2x1 subplot, plot ?(?) signal in the first row. Take ? between -20 s and 20 s with an increment of 1 ms. Limit the x-axis between -2 s and 2 s. Moreover, calculate and plot the magnitude spectrum of ?(?) as a function of ? (Hz) in the second row of the subplot. Note that, Fourier Transform of ?(?) should be calculated and plotted by using fft and fftshift functions of MATLAB. Limit the x-axis between -15 Hz and 15 Hz. Do not forget axis labels.

Use Verilog to design and implement a function as  c = c+∑b*ai, i is from 1 to 8. Here ai is stored in a SRAM with width as 16 and depth as 8 (8 rows of 16‐bit data), and b is stored in a 16‐bit register. c is initialized as 0.

Please compare : wall-plug efficiency and external quantum efficiency . Why we need these different efficiency ?