Explain complex power.

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Answer : Design considerations for illumination scheme of commercial complex: * Tasks to be performed in the space * Desired light levels based on the tasks performed in the space * Room size ... conditions * Cleanliness of the area during operation * Maintenance schedule * Availability of daylight

Description : Evaluate the following complex numbers

Answer : Evaluate the following complex numbers

Description : Evaluate the following complex numbers and leave your results in polar form

Answer : Evaluate the following complex numbers and leave your results in polar form

Description : Calculate these complex numbers and express your results in rectangular form

Answer : Calculate these complex numbers and express your results in rectangular form

Description : The Matrix has Complex eigenvalues and vectors

Answer : The Matrix has Complex eigenvalues and vectors

Description : Explain power relations in three phase circuit.

Description : Explain power in single phase AC circuit.

Description : Explain power system analysis.

Description : (i) Explain construction and working of geothermal power plant. (ii) Explain the construction and working of bomb calorimeter.

Answer : (i) Geothermal power plant: Construction and Working: geothermal power plant which consists of the following main components: Underground steam storage, steam separator, steam separator, turbine and Generator. Steam is ... . From the above data the calorific value of the fuel can be found. 

Description : Explain working of thermal power plant.

Answer : Working of thermal power plant: In this power plant, coal is used as a fuel for combustion in combustion chamber. After combustion of fuel the heat is generated and this heat is given to the ... by using cooling water and this condensate again used for the boiler with the help of feed pump. 

Description : Briefly explain how the power factor of an inductive circuit can be improved.

Answer : As we know that power factor should be corrected to ensure that the current supplied is cost friendly. Meaning the power factor should be around one but not greater than one(0.8-0.9) in a ... an inductive circuit due to the inductive reactance which oppose the change of current in the ac circuit. 

Description : Draw the block diagram of regulated power supply, explain function of each block and draw waveforms of each stage.

Answer : 1. A step down transformer 2. A rectifier 3. A filter 4. A regulator Operation of Regulated Power Supply:- Step Down Transformer:- A step down transformer will ... regulator. A regulator will maintain the output constant even when changes at the input or any other changes occur.

Description : Draw the block diagram of satellite sub-system and explain power subsystem.

Answer : POWER SUBSYSTEM- This system provides the necessary DC power to the satellite. All communication satellites derive their electrical power from solar cells. There is also a battery backup facility used during ... . to d.c. converter is used to raise the level of low voltages to high voltage.

Description : Classify condensers used in thermal power station. Explain each type in brief. 

Answer : Types of condenser: Classification: 1. Jet Condenser (Mixing Type) 2. Surface condenser (non Mixing type)  Explanation:-   1. Jet Condenser (Mixing Type) In Jet condenser the steam ... there in no direct contact between the steam and cooling water. This condensate is reused in boiler. 

Description : Explain the working of Hydro power station with schematic layout. 

Answer : Working of Hydro- Electric Power Plant: Water stored at high level by constructing dam across river. This stored water has potential energy. This stored water is passed to run the water ... energy and Alternator is coupled to water turbine which converts mechanical energy into electrical energy. 

Description : Explain the function of different parts of a typical nuclear power plant with neat sketch. 

Answer : Functions of each part of Nuclear power plant:-  1) Nuclear Reactor: In nuclear reactor the fuel rod of U235 is placed through which tremendous amount of heat energy is ... is mechanically coupled with steam turbine. 8) Alternator: It converts mechanical energy into electrical energy.

Description : With a neat diagram explain pumped storage hydro power plant. 

Answer : Diagram of pumped storage hydro power plant: Explanation: In this power plant, generator is so designed that it Converts mechanical power into electrical power and also works as a ... helps in reducing a reserve capacity of PP as it provides additional power during peak load period. 

Description : With a neat diagram explain solar photovoltaic power plant. 

Answer : Diagram of solar photovoltaic power plant :  Explanation:  Solar power plant consists of following components:  1. Photovoltaic cell panel: Its function is to convert sunrays directly into DC ... .  5. Step-up transformer: It step-up input voltage to utilization voltage e.g. 230V

Description : With a neat diagram explain medium head hydro-electric power plants. 

Answer : Diagram of medium head hydro-electric power plants:  Explanation:- If head of water is between 30 and 100 m, the plant is called a medium-head plant. Potential energy of ... Francis turbines are normally used. Alternator required in these plants is of low speed and large in diameter. 

Answer : Diagram explain solar power tower : All concentrating solar thermal power (STP) basic elements: Concentrator Receiver Transport-storage (a portion of the thermal energy ... with alternator which converts mechanical power to electrical energy Exhaust steam is condensate in condenser

Description : Draw and explain bulk correction method for power factor & control.

Answer : Bulk correction method for power factor & control: i) Here individual starter controls the capacitors located at distribution panel. ii) Centralized compensation is employed in large industrial plants where many ... capacitor units in steps to maintain P.F. more than preset limit (0.95). 

Description : Explain the “mitigation of power theft” and “faulty meter replacement” for energy conservation techniques to reduce commercial losses. 

Answer : Energy conservation techniques to reduce commercial losses:  1. Mitigation of Power Theft: Power theft being the most important issue which all of the service providing utilities ... agricultural sector. Prepaid meters may prove effective measures against unauthorized abstraction of energy. 

Description : Explain energy conservation technique “by improving power quality” for induction motor.

Answer : Energy conservation method in induction motor by improving power quality: Electrical energy can be conserved by improving the power quality. It can be achieved by avoiding voltage unbalance, maintaining ... losses can be minimized by using harmonic filter thus reducing the harmonics in the system.

Description : Explain captive power generation in brief

Answer : Advantages of captive power generation:  1. Reliability of supply increases. 2. Power quality is good. (Free from harmonics) 3. Transmission losses reduce as generation is nearby load centre ... . Same steam can be used for generation of electricity. Thus increase efficiency of industry.  

Description : State the types of radioactive waste generated in a nuclear power station. Explain the methods employed for their disposal.

Answer : Types of radioactive waste: The waste produced in nuclear power plant is in the form of solid, liquid & gases, 1. Solid Waste Disposal:-  Solid wastes removed from the reactor are very ... are measured. If it is safe then released to atmosphere at high level through large height chimney.

Description : Explain the importance of solar power in the energy deficient India.

Answer : Mainly electricity generated in India is from -  Hydro power plant  Thermal power plant  Nuclear power plant  BUT,  To construct new Hydro power plant following are problem :- 1. There is ... start) 10. It saves the fossil fuel (coal, diesel, oil etc.) which are limited available.

Description : Explain the nuclear chain reaction in a nuclear power plant.

Answer : Nuclear chain reaction in a nuclear power plant: If a slow moving neutron hits unstable heavy nucleus of nuclear fuel U235 or Pu239 , the neutron is absorbed, the nucleus splits into two more ... chain reaction can be controlled and desired heat energy can be obtained in nuclear power plant. 

Description : Explain with block diagram photovoltaic power generation.

Answer : Photovoltaic power generation:  Photovoltaic power generating system consists of following components: 1. Photovoltaic cell panel: Its function is to convert energy content of sunrays directly into DC ... . Step-up transformer: It step-up input voltage to utilization voltage e.g. 230V.

Description : Explain starting system in diesel electric power plant.

Answer : Starting system in Diesel Electric Power Plant: It includes Storage battery, compressed air tanks, self-starter etc. The purpose of engine starting system is to rotate the engine initially while ... as Ammeters, Voltmeters, Wattmeters, Thermometers, Pressure gauges, Visible and audible alarm etc.

Description : Explain the procedure for disposal of nuclear power plant.

Answer : Disposal of nuclear waste: The waste products by nuclear fission may be solid, liquid or gas. i) Solid harmful disposals are packaged as required and shipped to a burial site for disposal. ii) Liquids ... and tested. If the required limits are met, these will be released to atmosphere. 

Description : Explain fuel system and air intake system in diesel electric power plant.

Answer : Fuel system and air intake system in diesel electric power plant :  Fuel system: It consists of storage tank, strainers, fuel transfer pump and all day fuel tank. The fuel oil is supplied ... Filters are provided to remove dust particles from air which may act as abrasive in the engine cylinder.

Description : Explain ash disposal and dust collection in a thermal power plant.

Answer : Ash disposal:-  Various methods of disposal of ash are:  Mechanical handling system.  Pneumatic system. Hydraulic system  Steam jet system  Commonly used ash handling ... be done either manually or automatically.  This removed fly ash is collected in separate container

Description : Classify hydro-electric power plants according to water flow regulation and explain in brief.

Answer : Classification of hydro-electric power plants according to water flow regulation of water flow:-  1. Large reservoir power plant 2. Run-off river (ROR) power plant with poundage 3. Run-off River ... depends upon rate of flow of water Initial cost is less Its purpose is to generate electricity.

Description : Explain the term reactive power. Why it is sometimes essential to measure reactive power?

Answer : Reactive power: The reactive power (Q) is defined as the product of voltage(V), current (I) and sine of angle between voltage(V) and current( I) Therefore Reactive power Q = V I ... power so that corrective measures can be taken accordingly to maintain systems power factor near to the unity.

Description : With a neat sketch explain working of 1 phase dynamometer type power factor meter.

Answer : Working of 1 phase dynamometer type power factor meter : The current coil is connected in series with load. Two pressure coils marked as A and B are connected across the supply terminals ... becomes stationary and the pointer shows steady deflection corresponding to the power factor of the load. 

Description : Explain transformer isolated drive circuits providing both signal and power.

Description : Explain the formation of parasitic BJT and parasitic diode in Power MOSFET. Can parasitic diode be used in same power electronics applications?

Answer : Parasitic Diode: The parasitic diode is in between drain and source. The MOSFET structure itself contains parasitic diode or body drain diode. This parasitic diode allows the reverse flow of current when the ... of MOSFET as a BJT collector. Parasitic BJT operates in the cut-off region.

Description : Explain single line diagram.

Description : How does a turbocharger increase engine power?

Answer : How does a turbocharger increase engine power? The engine of a car, when driving uphill or traveling at high speed on the highway, experiences about the same as a runner at the end ... of compressed air also improves the combustion process, which positively affects the performance of the engine.

Description : Draw and label the gas turbine power plant

Answer : OR

Description : State the effects of low power factor on efficiency and voltage regulation of short transmission lines. 

Answer : i) Effect of Low power factor on efficiency:- When power factor of load reduces current drawn by transmission line increases so copper losses in transmission line increases, hence transmission ... increases, so voltage drop in transmission line increases so regulation increases. (Become Poor) 

Description : State features of wireless power transmission. 

Answer : Features of wireless power transmission:  1. Energy delivered anywhere in the world 2. Zero fuel cost 3. Less losses 4. Less use of copper wires 5. More efficiency 6. Minimum long- ... on cables would never exist in the transmission.  7. Power theft would be not possible at all. 

Description : What is the value of capacitance required to improve power factor from 0.7 to 0.9. Given that: Real power = 50 W Vrms of the source = 120 Frequency = 50 Hz   #powerfactor

Description : Summerise the role of power system engineer.

Answer : Role of power system engineer:  i. On the planning side he or she has to make decisions on how much electricity to generate  ii. For operation of the power system he has to plan for ... for energy conservation and load management. viii. For solving the power system problems he has to update with

Description : Power Electronic Devices

Description : Electric Power

Answer : Electric Power

Description : Find power delivered by voltage source

Answer : Find power delivered by voltage source

Description : Why engine power is measured in horsepower (HP) ?

Answer : James Watt compared engine output with that of work done by a horse. WD by horse = 746W.

Description : Why is AC better for long distance power transmission than DC ?

Answer : ac is more economical to transmit for long distances . wires can be made smaller by step up transformer .. since major cost are wires to transmit .. then at the end of distance step down transformer is used for commercial use.

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