Recent questions tagged thermodynamics

Description : In centrifugal pump operation, the cavitation can be eliminated by maintaining suction pressure __________ the vapor pressure of the liquid at the suction temperature. (A) Lower than (B) Higher than (C) Equal to (D) None of these

Last Answer : (B) Higher than

Description : What Is The Function Of Forebay?

Last Answer : Forebay is considered as naturally provided surge tank. It is temporary water storage when the load on the plant is reduced and provides water for initial increment on increasing load.

Description : What Is The Use Of Surge Tank?

Last Answer : The surge tank is used to provide better regulation of water pressure in the system. The surge tank controls the water when the load on the turbine decreases and supplies water when the ... variations resulting from the rapid changes in water flow in penstock and hence prevents water hammer.

Description : Why Trash Rack Is Used?

Last Answer : The trash rack is used to prevent the entry of debris, which might damage the turbine runners and chock up the nozzle of impulse turbine.

Description : What Is The Main Purpose Of The Dam?

Last Answer : The main purpose of the dam is to increase the height of water level and also to increase the working head of the hydraulic power plant.

Description : What Is The Main Purpose Of The Reservoir?

Last Answer : The main purpose of reservoir is to store water received from catchments areas during the rainy seasons and supply the same during the dry season.

Description : What Consists Of Cooling Water Circuit And Coal & Ash Circuit In Steam Power Plant?

Last Answer : The cooling water circuit consists of a pump, condenser and cooling tower. The coal and ash circuit consists of coal delivery, preparation of coal, handling of coal to the boiler furnace, ash handling and ash storage.

Description : What Consists Of Feed Water And Steam Flow Circuit In Steam Power?

Last Answer : The feed water and steam flow circuit consists of feed pump, economizer boiler drum super heater, turbine and condenser.

Description : What Consists Of Air And Flue Gas Circuit?

Last Answer : Air and flue gas circuit consists of forced draught fan, air preheater, boiler, furnace, superheater, economizer, dust collector, induced draught fan and chimney.

Description : Name The Four Major Circuits In Steam Power Plant?

Last Answer :  Coal and ash circuit  Air and flue gas circuit  Feed water and steam circuit  Cooling water circuit

Description : What Is Ductile-brittle Transition Temperature?

Last Answer : It is the temperature below which the tendency of a material to fracture increases rather than forming. Below this temperature the material loses its ductility. It is also called Nil Ductility Temperature

Description : Define Torque.?

Last Answer : Torque is defined as a force applied to an object that results in rotational motion.

Description : What Is Annealing?

Last Answer : It is a process of heating a material above the re-crystallization temperature and cooling after a specific time interval. This increases the hardness and strength if the material.

Description : What Is Gear Ratio?

Last Answer : It is the ratio of the number of revolutions of the pinion gear to one revolution of the idler gear.

Description : Explain The Nomenclature Of A 6203-zz Bearing?

Last Answer : 6 is the type code, which shows it is a single-row ball bearing, 2 is the series, means light, 03 is the bore, which is 17 mm and ZZ is the suffix meaning double shielded bearing.

Description : Explain Otto Cycle?

Last Answer : Otto cycle can be explained by a pressure volume relationship diagram. It shows the functioning cycle of a four stroke engine. The cycle starts with an intake stroke, closing the intake and moving to ... heat is rejected and the exhaust stroke. It was designed by Nicolas Otto, a German engineer.

Description : What Is Ps ?

Last Answer : PS is Pferdestarke, the German unit for Horsepower.

Description : How Many Joules Is 1 Btu?

Last Answer : 1 BTU is equal to 1055.056 joules.

Description : What Is A Newtonian Fluid?

Last Answer : A Newtonian fluid possesses a linear stress strain relationship curve and it passes through the origin. The fluid properties of a Newtonian fluid do not change when any force acts upon it.

Description : Define Reynolds Number.?

Last Answer : Reynolds number is the ratio of inertial force and viscous force. It is a dimensionless number. It determines the type of fluid flow.

Description : What Are The Points In The Stress Strain Curve For Steel?

Last Answer : Proportional limit, elastic limit or yield point, ultimate stress and stress at failure.

Description : What Is Bending Moment?

Last Answer : When a moment is applied to bend an element, a bending moment exists in the element.

Description : How Do You Measure Temperature In A Wet Bulb Thermometer?

Last Answer : Wet bulb temperature is measured in a wet bulb thermometer by covering the bulb with a wick and wetting it with water. It corresponds to the dew point temperature and relative humidity.

Description : Explain The Second Law Of Thermodynamics?

Last Answer : The entropy of the universe increases over time and moves towards a maximum value.

Description : Which Has More Efficiency: Diesel Engine Or Petrol Engines?

Last Answer : Off course Diesel engine has the better efficiency out of two.

Description : What Is Hess Law?

Last Answer : According to the Hess law the energy transfer is simply independent of the path being followed. If the reactant and the product of the whole process are the same then same amount of energy will be dissipated or absorbed.

Description : Which Is The Hardest Compound Known?

Last Answer : Diamond.

Description : Which Formula Forms A Link Between The Thermodynamics And Electro Chemistry?

Last Answer : Gibbs Helmholtz formula is the formula which forms the link between the thermodynamics and electromagnetism. ∆Hs/R = [∂ lnp /∂ (1/T)]x where: x - mole fraction of CO2 in the liquid phase p - CO2 partial ... K) R - universal gas constant α - mole ratio in the liquid phase (mole CO2 per mole of amine)

Description : What Is Carnot Engine?

Last Answer : It was being designed by Carnot and let me tell you that Carnot engine is an imaginary engine which follows the Carnot cycle and provides 100% efficiency.

Description : Is The Boiler A Closed System?

Last Answer : Yes definitely the boiler is a closed system.

Description : State Laws Of Conservation Of Energy?

Last Answer : According to the laws of conservation of energy, “energy can neither be created nor be destroyed. It can only be transformed from one form to another.”

Description : How Many Laws Of Thermodynamics Are There?

Last Answer : There are three laws of the thermodynamics. 1. First Law : Energy can be neither created nor destroyed. It can only change forms.In any process in an isolated system, the total energy remains ... 3. Third Law : As temperature approaches absolute zero, the entropy of a system approaches a minimum.

Description : What Is The Importance Of The Thermodynamics In The Field Of Mechanical Engineering?

Last Answer : All the mechanical engineering systems are studied with the help of thermodynamics. Hence it is very important for the mechanical engineers.

Description : Difference Between Flywheel And Governor?

Last Answer : The function of flywheel is to store the energy/power produced during the power stroke of an engine and this stored energy is used during remaining stroke to make piston up and down during working of ... load. It does this work by reducing or increasing the amount of fuel passing to the engine.

Description : Difference Between Tube And Pipe?

Last Answer :  There always a debate between differentiation of pipe and tube. Pipe is always designated by its Inside Diameter (ID) because main purpose of pipe is to carry fluid, while the  Tube ... tolerances as to that of pipe and tubes are more costlier in manufacturing compared to pipe production.

Description : At Which Temperature Thermal Radiation Can Become Zero?

Last Answer : Not possible. Because thermal radiation becomes only zero at absolute zero temperature which can never be attained by the third law of thermodynamics.

Description : What Is The Difference Between Heat Transfer And Thermodynamics?

Last Answer : Heat transfer deals with the energy analysis which in transition and and depends on the modes of heat transfer like conduction, convection and radiation or combination of any modes. Heat transfer deals ... with study of system at equilibrium and does not depend on how heat transfer is calculated.

Description : What Is The Significance Of Entropy?

Last Answer : As per the second law of thermodynamics, any heat input to the system (Heat engine) cannot be converted completely into useful work. Some energy is lost and that is called 'unavailable work'. The amount of unavailable work increases as the entropy increases.

Description : When A Real Gas Behaves Like Ideal Gas?

Last Answer : A real gas behaves like an ideal gas in low pressure and high temperature conditions.

Description : Why Poisson Ratio Is Higher In, Rubber/steel/wood?

Last Answer : When a material is compressed in one direction, it usuallytends to expand in the other two directions perpendicular tothe direction of compression. This phenomenon is called the Poisson effect. Poisson's ratio is a ... For steel = 0.288 For wood < 0.2 Thus Poisson's ratio is higher in RUBBER.

Description : What Happens If Gasoline Is Used In A Diesel Engine, Siesel Engine Will Work?

Last Answer : No, It will not work, as the Compression ratio of Petrol engine is 6 to 10 & that of Diesel engine is 15 to 22. Thus on such high compression, gasoline gets highly compressed & it may blast.

Description : The Fatigue Life Of A Part Can Be Improved By?

Last Answer : Improving the surface finish by Polishing & providing residual stress by Shot peening.

Description : How To Calculate Bearing Number Ti Diameter Of The Inner And Outer?

Last Answer : Divide the shaft diameter size by 5, it will give last two digit of the bearing no. and according to type of load we have to choose the type of bearing and that will give prior number of the bearing.

Description : When Crude Oil Is Heated, Which Hydrocarbon Comes First?

Last Answer : Natural gas (Gasoline)… at 20 Celsius

Description : Which Mechanism Is Used In Automobile Gearing System?

Last Answer : Differential mechanism

Description : Definition Of Octane Number And Cetane Number?

Last Answer : Octane No:-Octane number is defined as the percentage, by volume, of iso octane in the mixture of iso octane and h-heptane. It is the measure of rating of SI engine. Cetane No:- Cetane number ... in the mixture of n-cetane and alpha methyl naphthalene. It is the measure of rating of CI engine.

Description : Explain Bicycle Rear Wheel Sprocket Working?

Last Answer : Rear wheel sprocket works under the principle of ratchet and pawl.

Description : How Much Watt Means 1hp?

Last Answer : 746.2 Watt

Description : Why Different Types Of Sound Are Produced In Different Bikes, Though They Run On Si Engines?

Last Answer : Engine specifications are different in different manufactures like as Bore Diameter (CC), Ignition timing. Also the exhaust passage takes more responsible for sound.

Description : Why Entropy Decreases With Increase In Temperature?

Last Answer : ds=dQ/T. Entropy is inversely proportional to the temperature so, as temp. Increases, entropy decreases.