Recent questions tagged power

asked Jan 7 by anonymous

Define isothermal efficiency of compressor.

Last answer: Isothermal Efficiency of compressor: It is the ratio of isothermal work (or power) required to drive compressor to the actual work required to drive compressor for the same pressure ratio. Mathematically isothermal efficiency is given as the ratio of isothermal power to shaft or brake power.

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asked Jan 7 by anonymous

Draw P-V and T-S diagram for isochoric process.

Last answer: Isochoric Process:

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asked Jan 7 by anonymous

Explain construction and working of two stage reciprocating air compressors.

Last answer: Figure: Two Stage Reciprocating air compressor Construction and Working : It consists of two cylinders (L.P. and H.P.) with water cooled intercooler and air receiver. First of all fresh air is ... (ie second stage) from 3 to 4 is delivered by the compressor at pressure P3 & Temp T4.

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asked Jan 7 by anonymous

Describe construction and working of closed cycled gas turbine.

Last answer: Construction: In above figure shows a closed cycle gas turbine which consists of compressor, heating chamber gas turbine which drives the generator, compressor and a cooling chamber. ... is cooled at constant pressure with the help of circulating air is circulated through compressor.

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asked Jan 7 by anonymous

Explain the construction and working of Turbo-prop engine.

Last answer: Turboprop Engine: Construction and working: It consists of diffuser, compressor, combustion chamber, turbine, nozzle and propeller. Figure shows a turboprop system employed in aircrafts. Here ... energy of the incoming air (equal to aircraft velocity) into pressure energy by diffuser.

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asked Jan 7 by anonymous

State necessity of multistaging and Intercooling of air compressor.

Last answer: Necessity of multistaging - For producing high pressure i.e. more than 8 bar, single stage air compressor suffers fallowing drawbacksi) Size of cylinder is too large ii) Rise ... also automatically decreased and volumetric efficiency is also decreases. To avoid this intercooling is necessary.

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asked Jan 7 by anonymous

Explain the sources of air leakage in condenser.

Last answer: Sources of air leakage in condenser 1. Air leak through joints and packing. Air leaks into condenser as pressure inside falls below atmospheric pressure. 2. Air also comes in condenser with the steam. ... separated at low pressure in the condenser 4. Air leaks if any bypass seal is broken.

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asked Jan 7 by anonymous

Draw P-V and T-S diagram of dual combustion cycle.

Last answer: Dual combustion cycle: 1-2 Isentropic compression of air 2-3 the combustion of fuel at constant volume. 3-4 the combustion of fuel at constant pressure 4-5 Isentropic expansion during which work is done by the system. 5-1 Heat rejection at constant volume.

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asked Jan 7 by anonymous

Differentiate between : (i) Reciprocating and rotary air compressor (ii) Centrifugal and axial flow compressor

Last answer: (i) Reciprocating and rotary air compressor: Sr. No. Reciprocating air compressor Rotary air compressor 1 It is having to and fro motion. It is having rotary ... I.C. engine and for refrigerants and industrial gases. Used universally with large gas turbine.

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asked Jan 7 by anonymous

Explain two pass down flow surface condenser with a neat sketch.

Last answer: Two pass down flow surface condenser: It consists of horizontal cast iron cylindrical vessel pack with tubes, through which the cooling water flows. The ends of the condenser are cut off by vertical ... convert into water; therefore whole condensate can be the reused in the boiler.

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asked Jan 7 by anonymous

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

Last 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.

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asked Jan 7 by anonymous

Explain combustion chemistry of carbon, hydrogen and methane.

Last answer: Combustion chemistry of carbon, methane and hydrogen: i) Carbon: Burning of carbon to carbon dioxide ( complete combustion ) That means 1 kg of carbon needs 2.67 kg oxygen and produces 3.67 ... equitation 1 kg of hydrogen combines with 8 kg of oxygen to produce 9 kg of steam.

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asked Jan 7 by anonymous

Compare liquid fuels with solid fuels.

Last answer: S.N. Solid fuel Liquid fuel 1 Require more space for storage. Require less space for storage. 2 Lower calorific value Higher calorific value 3 Difficult control ... ash produced 5 deterioration of the oil in storage Non-deterioration of the oil in storage

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asked Jan 7 by anonymous

Draw and label the gas turbine power plant

Last answer: OR

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asked Jan 7 by anonymous

Explain working of thermal power plant.

Last 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.

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asked Jan 7 by anonymous

Draw P-V and T-S diagram for brayton cycle.

Last answer: P-V and T-S diagram for brayton cycle.

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asked Jan 7 by anonymous

Give classification of air compressor.

Last answer: Give classification of air compressor.

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asked Jan 7 by anonymous

Explain the factors affecting volumetric efficiency of reciprocating air compressor.

Last answer: Factors affecting volumetric efficiency of reciprocating air compressor: 1) Clearance Volume 2) Restricted passage and leakage at inlet valves 3) Speed of rotation 4) Piston ring leakages ... wall, it get expanded, which decreases the charge taken in therefore volumetric efficiency decreases.

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3 views 1 answer

asked Jan 7 by anonymous

Explain the working of La-mont boiler

Last answer: La-mont boiler: Working: The La-mont boiler consists Boiler shell, combustion chamber, evaporator, economizer, circulating pump, super heater, and steam drum. This is modern high ... drawn through the super heater. The superheated steam so obtained is then supplied to the prime mover.

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asked Jan 7 by anonymous

Draw neat and labeled sketch of three pass packages type boiler.

Last answer: Each set of tubes that hot combustion flue gas travels through before making a turn within the boiler, is considered a "pass." A 3-pass fire tube boiler design consists of three sets of ... design that allows more heat transfer time to deliver the same or higher efficiency rating.

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asked Jan 7 by anonymous

Describe the different modes of heat transfer.

Last answer: Mode of heat transfer:- 1) Conduction 2) Convection 3) Radiation 1) Conduction- It is the mode of heat transfer from one part of substance to another part of same substance or one ... in the form of electromagnetic waves. Example: The heat energy receives from sun to the earth surface.

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asked Jan 7 by anonymous

Explain Otto cycle with P-V and T-S diagram.

Last answer: This cycle is so named as it was conceived by Otto'. On this cycle, petrol, gas and many types of oil engines work. It is the standard of comparison for internal combustion engines. Figs. ... 4-1 shows the rejection of heat by air at constant volume till original state (point 1) reaches.

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15 views 1 answer

asked Jan 7 by anonymous

Describe the working of Turbojet Engine

Last answer: Turbojet Engine OR Working :Turbo-jet engine consists of diffuser, compressor, combustion chamber turbine and nozzle. At entrance air diffuser causes rise in pressure in entering air ... and thrust of propulsion is produced. The velocity in the nozzle is grater then flight velocity.

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asked Jan 7 by anonymous

Explain the phases of formation of steam.

Last answer: Different phases of Formation of steam Consider formation of steam from ice at -200 C i)Solid phase- When the heat is added in ice which is at -20 0C, the temperature of ice increases ... the temperature of steam which is called as superheating and in this region only vapour is present.

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asked Jan 7 by anonymous

Represent Isobaric, Isochoric, Isothermal, Adiabatic process on P-V and T-S diagram.

Last answer: Isobaric process Isothermal process Isochoric process Adiabatic process:

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asked Jan 7 by anonymous

List properties of Fuels

Last answer: Properties of fuels: 1. It should possess high calorific value. 2. It should have proper ignition temperature. The ignition temperature of the fuel should either be neither too low nor too high. 3. It ... moisture content. 9. It should be cheap. 10. It should be easy to handle and transport.

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asked Jan 7 by anonymous

Give the classification of Fuels.

Last answer: Give the classification of Fuels.

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asked Jan 7 by anonymous

Enlist conventional and non-conventional energy sources.

Last answer: Conventional energy source: 1) Coal 2) natural gas 3) oil 4) fire wood. Non-conventional energy sources: 1) Solar power 2) Hydro-electric power 3) Wind power 4) Tidal power 5) Ocean wave power 6) Geothermal power 7) Ocean thermal power 8) Biomass, Bio-fuel etc.

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asked Jan 7 by anonymous

Give the classification of gas turbine

Last answer: Answer: Classification of gas turbine: 1. According to the path of the working substance: i) Open cycle gas turbine ii) Close cycle gas turbine iii) Semi-closed cycle gas turbine 2. According ... turbine ii) Reaction turbine 5. According to their usage: i) Constant speed ii) Variable speed

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asked Jan 7 by anonymous

List down the uses of compressed air

Last answer: Application of compressed air: 1. Operating tools in factories 2. Operating drills and hammers in road building 3. Starting diesel engines 4. Operating brakes on buses, trucks and trains 5. Spray painting 6. Excavating 7. To clean the large workshops Etc.

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asked Jan 7 by anonymous

Define free air delivered of compressor

Last answer: Free Air Delivered (FAD): any two points It is the actual volume of air delivered by the compressor when reduced to NTP. FAD is a flow rate of air derived from measurement at the ... outlet of a compressor, converted back to the actual inlet (free air) conditions before it was compressed.

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asked Jan 7 by anonymous

Define sensible heat and latent heat

Last answer: Latent heat: It is defined as the quantity of heat required for phase change of working substance at saturation temperature. OR The amount of heat added at saturation temperature is called latent ... thermometer. OR The amount of heat added up to saturation temperature is called sensible heat.

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asked Jan 7 by anonymous

List different types of ideal gas processes

Last answer: Following are the different types of ideal gas processes 1. Isochoric (constant volume process) 2. Isobaric (constant pressure process) 3. Isothermal (constant temperature process) 4. Isentropic (constant entropy process) 5. Polytropic process

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asked May 22, 2020 by anonymous

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

Last 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)

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asked May 22, 2020 by anonymous

State features of wireless power transmission.

Last 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.

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asked May 19, 2020 by anonymous

Calculate the energy stored in the inductor and capacitor, respectively.

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asked May 17, 2020 by anonymous

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

Last 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.

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asked May 17, 2020 by anonymous

What is the value of capacitance required to improve power factor from 0.7 to 0.9.

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

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184 views 0 answers

asked May 6, 2020 by anonymous

Summerise the role of power system engineer.

Last 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

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42 views 1 answer

asked May 2, 2020 by anonymous

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

Last 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.

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471 views 3 answers

asked Apr 20, 2020 by anonymous

Power Electronic Devices

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asked Apr 8, 2020 by anonymous

Electric Power

Last answer: Electric Power

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asked Mar 21, 2020 by anonymous

Find power delivered by voltage source

Last answer: Find power delivered by voltage source

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asked Aug 25, 2019 by anonymous

Why engine power is measured in horsepower (HP) ?

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

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183 views 2 answers

asked Aug 25, 2019 by anonymous

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

Last 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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166 views 4 answers

asked Aug 18, 2019 by anonymous

Why don't we burry power lines underground ?

Last answer: Because conductor used for power transmission are not insulated and if we do so it create phase to ground fault causing interruptions to supply.

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77 views 5 answers

asked Aug 18, 2019 by anonymous

Why capacitors are used to improve power factor?

Last answer: Capacitors generate reactive power instead of that drawn from source which is required by inductive loads.so it reduce the reactive current which is drawn from source to be drawn from capacitor.This control in Electric bills cost.

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112 views 3 answers

asked Aug 8, 2019 by anonymous

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

Last 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.

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2.9k views 1 answer

asked Aug 2, 2019 by anonymous

Compare the Nuclear power station with Hydro power station.

Last answer: SR. No. Points Nuclear Power plant Hydro Power station 1 Site/ Location Where there is ample supply of water is available, away from thickly populated areas to avoid radioactive ... Field Application As base load Used as base load during as well as peak load

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asked Aug 2, 2019 by anonymous

What are the basic requirements of locating wind power plant ?

Last answer: The basic requirements of locating wind power plant: 1) The site should be selected where winds are strong i.e. where pressure of wind is high and there is continuity. 2) Wind pressure ... the turbine which can affect the system's overall performance. 10)Possibility to connect to power grid.

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88 views 1 answer