GO 150 Lab 5

In 2-pole machines: the wave winding have greater generated voltage than *.the lap winding armatures True False *.For high rotating speed machines the number of poles must be Little True False The reactance voltage is added in the coil undergoing commutation to * reduce the spark True False

QUESTIONS 1. Define the following terms: (a) Pitch (b) Upwind turbine (c) Downwind turbine

30. In the circuit of Figure P28.30, determine (a) the cur- W rent in each resistor and (b) the potential difference across the 200-2 resistor. + 40.0 V 360 V 80.0 V + 200 Ω 80.0 Ω 20.02. Figure P28.30 70.02. +

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Describe the operation of a synchronous condenser and its applications in power systems. How does it provide reactive power support and voltage stability?

Explain the working operation of the transformer in a microwave oven. Sketch a circuit diagram in order to ease your explanation and include the current flow from power supply, the generation of magnetic field and other important labels.

Q1. Describe the following related to Current Transformer (CT): (i) Draw the equivalent circuit diagram of CT and develop the corresponding phasor diagram. Draw the transient response of CT and describe the transient errors in a CT. [5] [5] (ii)

What will be the voltage drop and regulation in resistive, inductive, capacitive load with the no-end voltage of the alternator? Please explain. % Rg = (Ea-Ut) / Ut (% Rg: Percentage voltage regulation, Ea: Alternator free end voltage, Ut: Alternator full load end voltage) (Note:I would be glad if it was written by computer.)

choose the correct answer :-  15. Over currents cause stresses on the plant elements .......... and .. ...... in direct proportion to their amplitude and duration of action . The most appropriate words that should come into the gaps are given in which point correctly.  a) magnetic ........ dynamicb) excessively ......... effectivec) thermal ..... magneticd) basic ...... effectivee) dynamic ..... thermal

Describe the operation of a synchronous condenser in a power system. What are its applications and benefits?

Determine the instantaneous equation for the voltage waveform shown in figure, if Vp=200 Volts, Time period is 20 milli seconds and =25 degrees. Vp EN

Describe the purpose and operation of transformers in electrical power systems.

Need help with 4B

The single - phase ac voltage controller with inductive load. Plot the waveform of output voltage and voltage in each thyristor if the B = 10 %3D degree and delay angle (alpha) in both thyristor is 1- (30 degrees) 2- (90 degrees) 3- (120 degrees)

Answer all questions.

A voltage multiplier has 12 stages Capacitances, all equal to 0.08 μF. Thesupply transformer secondary voltage is 150 kV at a frequency of 100 Hz. Load current 0,006A.What is the percentage ripple, the regulation and the optimum number of stages for minimumregulation or voltage drop.

Q-1: Give brief answer to the following: (Answer Ten only)1) what is the potential transformer used for in power substation?2) what is process leads to lowering the number of free electrons?3) what is The Townsend’s Criterion4) why Sulphur Hexafluorid has good insulation strength?5) What is Intrinsic Breakdown6) why do bubbles lead to breakdown of liquid?7) how to decease the ripple voltage of cockroft-walton voltage multiplier circuit8) how much the maximum charging current of A Van de Graaff generator has a beltwidth 1 m, a belt speed of 4 m/s, and charge density of 10 c/m29) Why does need for Reactive Power Compensation in test transformer?10) The output voltage of series resonant circuit is given by the formula _________11) what is impulse voltage and what is its standard wave shape?12) Which advice can measure impulse voltage?

Solve it quickly please

Explain the concept of phasor measurement units (PMUs) and their role in real-time monitoring and control of power systems.

Give the analogous quantities for electrical current in pneumatic, hydraulic and thermal systems. b. Give example for isomorphic electric, pneumatic, hydraulic and thermal systems.

The torque angle of synchronous machine operating from a constant voltage bus, is usually defined as the space angle between rotor mmf wave and resultant flux-density wave O True O False

Solve it quickly please

Q-1: Give brief answer to the following: (it 1) what is the potential transformer used for in power substation? 2) what is process leads to lowering the number of free electrons? what is The Townsend's Criterion 3) 4) why Sulphur Hexafluorid has good insulation strength? 5) 6) why do bubbles lead to breakdown of liquid? 7) What is Intrinsic Breakdown how to decease the ripple voltage of cockroft-walton voltage multiplier circuit 8) how much the maximum charging current of A Van de Graaff generator has a belt width 1 m, a belt speed of 4 m/s, and charge density of 10 µc/m2 9) Why does need for Reactive Power Compensation in test transformer? 10) The output voltage of series resonant circuit is given by the formula 11) what is impulse voltage and what is its standard wave shape? 12) Which advice can measure impulse voltage?

Please try to answer all subparts in short...please..

The .. of the hysteresis loop is a measure of energy ..... lost per cycle a) area. b) Type. c) Frequency d) No one of the above. Fringing effect is a phenomena occurs in . a) Transformers. b) Electrical field. c) Air gap d) All of the above.

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3c.The initial load angle at steady-state stability is δ0 and the related mechanical power, P0. With the occurrence of a transient fault the load angle advances to δ1 with a corresponding electrical power of P1. After the successful clearance of the fault the load angle moves to δ2 and electrical power, P2. Use the given information to answer the following questions. Derive equations for: i) the accelerating area. ii)    the decelerating area                                                                   iii)         the critical clearing angle

Permanent Magnet Moving Coil (PMMC) meters can be used for both AC and DC measurements. O a. TRUE O b. FALSE

a) A sinewave is having a frequency of 50 Hz and instantaneous value of 250 Volts at 1.5 milli seconds. Find i) The maximum value of sinusoidal voltage waveform and ii) The value of voltage at 1.8 milli seconds. b) Determine the instantaneous equation for the voltage waveform shown in figure, if Vp%3D200 Volts, Time period is 20 milli seconds and =50 degrees. Vp Ф Upload your Answers steps in the "Final Answer Submission" Link provided in the Moodle. a) (i) Maximum value = a) (ii) Value of voltage at 1.8 ms = b) Angular frequency =

Question 1 A 125 MVA, 20 kV, three-phase, wye-connected, 60 Hz, synchronous alternator is connected to a 20 kV power grid. The alternator has negligible armature resistance and synchronous reactance of 5 2/phase. The mechanical limit of the turbine powering the alternator limits its maximum power output to 100MW. (a) Calculate the value of excitation voltage (line to neutral with angle) needed for 50% maximum power (50MW) at unity pf. |E(LN) 8 (b) Find the alternator reactive power import/export if its real power output is now increased to 75% rated (75 MW) with the excitation unchanged. (1) Draw before and after phasor diagrams on the same axes (performance chart) to illustrate the two operational states. (ii) Calculate the alternator reactive power import/export when its real power output is increased to 75% rated (75 MW) with the excitation unchanged. Q3ph Import or export?

A docs.google.com/f 0 :D welding purpose is a shunt generator Indicate whether the following - * statement are true or false False True In a dc machine for the same value of Z, N, O armatūre, e.m.f. is more with wave winding than with lap winding