Write the formula to calculate efficiency.

1 Answer

Answer :

W

x 100 where

H

(pronounced as Eeta )

Efficiency

W workdone by the engine

H Heat energy input

Related questions

Description : The formula to calculate the efficiency of a heat engine is

Last Answer : W x 100

Description : Morse test is conducted on the engine to calculate the mechanical efficiency of A. single cylinder CI engine B. single cylinder SI engine C. only on two stroke engines D. multi cylinder engine

Last Answer : ANSWER : D

Description : Pick out the correct statement. (A) The slope of the stripping line is always less than unity (B) For a given separation in a binary distillation column, with increase in reflux ratio ( ... (D) Kremser-Brown-Souder's equation is used to calculate the efficiency of a plate tower

Last Answer : C) In Ponchon-Savarit method of no. of theoretical plate determination, the stripping and rectifying operating lines are vertical at total reflux

Description : In a heat treatment shop, steel components are heat-treated in batches of 80 Tons. The  heat treatment cycle is as follows;  Increase temperature from 30 OC to 850 OC in 3 hours.  ... efficiency of 80%, for same requirement. The investment towards installation of  the new furnace is Rs. 50

Last Answer : Quantity of steel treated per batch - 80 Tons a. Efficiency of Furnace: Useful heat supplied to steel - 80000 x 0.12 x (850 - 30)   = 7872000 kcal/batch .1 mark Total heat ... = Rs. 64400/batch Efficiency of new LPG furnace - 80% Heat supplied in new LPG furnace - 7872000/0.8

Description : Debtors turnover ratio is used to calculate------ a) efficiency b) solvency c) liquidity d) profitability

Last Answer : a) efficiency

Description : In otto cycle compression ratio is 8. Calculate air standard efficiency. Will it be grater than Carnot Cycle ? Justify your answer. 

Last Answer : No, the Otto cycle efficiency 56.47% will always be lower than Carnot cycle efficiency. Justification: Carnot theorem states that keeping operating conditions same, Carnot engine is more efficient than any other engine. So, Otto cycle efficiency is lower than Carnot cycle efficiency. 

Description : A 150 kW electric motor has an efficiency of 92 %, when it operates at full load. Calculate the losses in the machine.  (A) 92 kW (B) 150 kW (C) 163 kW (D) 13 kW 

Last Answer : efficiency  -output /input * 100 150/0.92----------163(input) losses-----(163--150)  ---------13kw.

Description : Does anyone know a mathematical formula to calculate the surface area of bubbles in a sink or bathtub of suds?

Last Answer : Too many variables when it comes to the size and quantity of the bubbles.

Description : Is there a formula that can calculate rainfall on a gallons-per-square-mile basis?

Last Answer : answer:It's a relatively straightforward conversion problem. Once you figure out how big the drops are (and if you have a good count of drops per minute per area) then it's not hard at all. The tough ... but your example is close enough to that). EDIT: 1 Acre-Foot of water is 325,852 US gallons.

Description : Formula to calculate the effort needed to pull a weight on two wheels up an incline?

Last Answer : isn't the formula the same as escape velocity?

Description : Calculate the formula unit mass of NaCl and CaCl2. -Chemistry 9th

Last Answer : hii Here's your answer Molar mass of Na=23g/mol " " " Cl=35.5g/mol Formula unit mass of NaCl=23 + 35.5 = 58.5 gm per mole Molar mass of Ca=40g/mol Molar mass of Cl2= 35.5g/mol*2=70gm per mole F. U. M. = 40+70=110 gm per mole

Description : What is the Formula to calculate wet density of soil?

Last Answer : It is the mass of wet soil divided by its volume.

Description : What formula is used to calculate slope?

Last Answer : (X1,Y1) (X2,Y2)Step One: Identify two points on the line.Step Two: Select one to be (x1, y1) and the other to be (x2, y2).Step Three: Use the slope equation to calculate slope.

Description : What is the formula 220 - your age calculate?

Last Answer : What is the answer ?

Description : Is there a formula I can use to calculate how many sandbags I should get?

Last Answer : You will need 800 sandbags for every 1 ft of wall that needs covering.

Description : The formula to calculate maximum urea clearance is U V× B , where U denotes (A) Concentration of urea in urine in gm/24hr (B) Concentration of urea in urine in mg/100 ml (C) Concentration of urea in blood in mg/100 ml (D) Volume of urine in ml/mt

Last Answer : Answer : B

Description : Which formula is used to calculate mass moment of inertia (I G ) of a circular rim about the axis through centre of gravity? a. mr 2 /2b. mr 2 /12 c. mr 2 /4 d. mr 2

Last Answer : d. mr 2

Description : Calculate the power output in horsepower of an 80-kg man that climbs a flight of stairs 3.8 m high in 4.0 s.  a) 744.8 hp  b) 0.998 hp  c) 746 hp  d) 1.998 hp Formula: Power = Fd/t = mgh/t F = W = mg d = h

Last Answer : 0.998 hp

Description : Assuming compression is according to the Law PV = C, Calculate the initial volume of the gas at a pressure of 2 bars w/c will occupy a volume of 6m³ when it is compressed to a pressure of 42 Bars.  a) 130m³  b) 136m³  c) 120m³  d) 126m³ Formula: P1V1/T1 =P2V2/T2

Last Answer : 126m³

Description : Gas is enclosed in a cylinder with a weighted piston as the stop boundary. The gas is heated and expands from a volume of 0.04 m^3 to 0.10 m^3 at a constant pressure of 200kPa.Calculate the work done by the system.  A. 8 kJ  B. 10 kJ  C.12 kJ  D.14 kJ Formula: W = p(V2-V1)

Last Answer : 12 kJ

Description : Helium ( R= 0.4698 BTU/lbm-˚R ) is compressed isothermally from 14.7 psia and 68 ˚F. The compression ratio is 1:4. Calculate the work done by the gas.  A. –1454 BTU/lbm  B. -364 BTU/lbm  C.-187BTU/lbm  D.46.7 BTU/lbm Formula: W = RT ln (V2/V1)

Last Answer : -364 BTU/lbm

Description : Calculate the entropy of steam at 60psiawith a quality of 0.8  A. 0.4274 BTU/lbm-˚R  B. 0.7303 BTU/lbm-˚R  C. 1.1577 BTU/lbm-˚R  D. 1.2172 BTU/lbm-˚R Formula: fromthe steamtable at 60 psia: sƒ = 0.4274 BTU/lbm-˚R sƒg = 1.2172 BTU/lbm-˚R) s = sƒ + x sƒg where x = is the quality

Last Answer : 1.1577 BTU/lbm-˚R

Description : A vessel with a volume of cubic meter contains liquid water and water vapor ion equilibrium at 600 kPa. The liquid water has mass of1kg. Using the steam table, calculate the mass of the water vapor.  A. 0.99kg  B. 1.57 kg  C ... / kg vg = 0.3157 m^3 / kg Vtot = mƒ vƒ + mg vg mg = (tot-mƒ vƒ) / vg

Last Answer : 3.16 kg

Description : A 10m^3 vessel initially contains 5 m^3 of liquid water and 5 m^3 of saturated water vapor at 100 kPa. Calculate the internal energy of the system using the steam table.  A. 5 x10^5 kJ  B. 8x10^5 kJ  C. 1 ... 3 kJ/kg ug= 2506kJ/kg formula: Mvap = V vap/vg M liq = Vliq/ vƒ u =uƒM liq + ug M vap

Last Answer : 2 x10^6 kJ

Description : What is the formula for determining the efficiency of generator ?

Last Answer : Generator efficiency = (effective power * 100) / given power

Description : What is the formula for motor efficiency ?

Last Answer : Motor efficiency = (output / input) 100

Description : Define rectification efficiency. Give its formula.

Last Answer : The ratio of output DC power delivered to the load to the applied input AC power is called rectification efficiency. It is denoted by η. η = Output DC power delivered to the load / Input AC power from transformer secondary η = Pdc / Pac

Description : Define efficiency of a transformer. State its formula.

Last Answer : the efficiency of a transformer is defined by the ratio of output of the transformer to the input to it. this is denoted by the symbol called eita. Efficiency = output/Input*100%