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what is heat sink ?

what is heat sink ?
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Heat sink transfer the heat from any chip or any electronics equipment to the surrounding (generally it air). Heat sink reduce heat on equipment. It may be use with LED or any equipment which generating heat . Heat reduces efficiency in most of the cases so we use heat sink.

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use of heat sink.
Description :

use of heat sink.

Answer :

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The unit heat rate characteristic of a thermal power unit shows :  (A) Heat input per kWh of output versus the megawatt output of unit  (B) Heat input per kW of output versus the megawatt output of unit  (C) Heat input per kWh of output versus the megawatt hour output of unit  (D) Heat input per kW of output versus the megawatt hour output of unit

Answer :

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Describe the different modes of heat transfer.

Answer :

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Define sensible heat and latent heat 

Answer :

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Description :

Explain with reason through which side of shell and tube heat exchanges, the following liquids are directed. (i) viscous liquid (ii) high pressure liquid (iii) corrosive liquid

Answer :

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With neat sketch explain the construction and working of heat exchanger used for handling corrosive liquid.

Answer :

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Description :

Draw a neat labelled diagram of 1-2 shell and tube heat exchanger. 

Answer :

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Calculate the rate of heat transfer by radiation from an unlagged steam pipe, 50 mm o.d. at 393K to air at 293K emissivity e = 0.9.

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Description :

Name any four types of shell and tube heat exchanger.

Answer :

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Give the unit of overall heat transfer coefficient in SI and MKS.

Answer :

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Define film heat transfer coefficient.

Answer :

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Define steady state heat transfer.
Description :

Define steady state heat transfer.

Answer :

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asked Jan 5 by anonymous
Heat in a conductor is produced on the passage of electric current due to?
Description :

Heat in a conductor is produced on the passage of electric current due to?

Answer :

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asked Mar 25, 2018 by anonymous
Direct conversion of heat into electric power is possible through?
Description :

Answer :

By  use  of  thermocouple.

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Power transistors with heat sink are fixed by

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Power transistors with heat sink are fixed by Fastening

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Description :

Define isothermal efficiency of compressor.

Answer :

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Description :

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

Answer :

Isochoric Process: 

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Explain construction and working of two stage reciprocating air compressors.

Answer :

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Description :

Describe construction and working of closed cycled gas turbine.

Answer :

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Explain the construction and working of Turbo-prop engine.

Answer :

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State necessity of multistaging and Intercooling of air compressor.

Answer :

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Explain the sources of air leakage in condenser.

Answer :

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

Answer :

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

Answer :

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Description :

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

Answer :

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

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asked Jan 7 by anonymous
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Description :

Explain combustion chemistry of carbon, hydrogen and methane.

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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Description :

Compare liquid fuels with solid fuels.

Answer :

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Draw and label the gas turbine power plant
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Draw and label the gas turbine power plant

Answer :

OR

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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. 

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

Answer :

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

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Give classification of air compressor.

Answer :

Give classification of air compressor.

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Description :

Explain the factors affecting volumetric efficiency of reciprocating air compressor.

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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Description :

Explain the working of La-mont boiler

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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Description :

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

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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Description :

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

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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Description :

Describe the working of Turbojet Engine

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
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Description :

Explain the phases of formation of steam.

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.
Description :

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

Answer :

Isobaric process Isothermal process Isochoric process Adiabatic process:

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List properties of Fuels
Description :

List properties of Fuels

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.
Description :

Give the classification of Fuels.

Answer :

Give the classification of Fuels.

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Enlist conventional and non-conventional energy sources.
Description :

Enlist conventional and non-conventional energy sources.

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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Description :

Give the classification of gas turbine

Answer :

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Description :

List down the uses of compressed air

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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Description :

Define free air delivered of compressor

Answer :

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Description :

List different types of ideal gas processes

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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Description :

Explain the type of multiple effect evaporator feed arrangement used for handling viscous liquid.

Answer :

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Description :

Explain Wilson plot.

Answer :

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Description :

Explain Kirchhoff’s Law with its mathematical expression in detail.

Answer :

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Description :

With a neat diagram explain the construction of calendria type evaporator.

Answer :

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