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In respect of the power flow problem, the following four variables are associated with
each bus
Question 2
When line losses are neglected, simpler expressions for line parameters are
obtained. How are the expressions of the exact
Question 10
Th goal of the equal area criteria in transient stability is to determine whether a system
is stable or not without having to completely integrate the system response. The
system will be stable after the fault if:
(1) The acceleration area is greater than 1.0 per unit.
(2) The acceleration area is greater than the deceleration area.
(3) The deceleration area is smaller than the acceleration area.
(4) The deceleration area is greater than the acceleration area.
Question 1
Which of the following is an advantage of using bundled conductors in transmission
lines?
(1) They reduce radio interference and corona at the cost of increasing line series
reactance.
(2) They reduce line series reactance, radio interference and corona.
(3) They increase line charging reactance and series reactance.
(4) They have high tensile strength and increase the skin effect.
Find I1,I2,I3,I4 and I5 by applying KVL or KCL of given circuit
The fig figure below shows water flowing through a pipe reducer. the static pressure at(1) and (2) are measured using the manometer with a fluid of SG < 1 find( by applying Bernoulli's equations) a) barometer reading X=f (Q,A1,A2,SG)
b)p1-p2=f(theta,r,SG,L)
c)if the vapour pressure of the water at the prevailing conditions is p=1.765kPa ,what the minimum area ratio(A2/A1) to prevent cavitation.
Assume P1/P2=5.6,SG=0.85,Q=0.05m3/s,D1=0.3m,L=1.5m and theta=30°
Sulphur dioxide is to be scrubbed from an air stream in a small packed tower by contacting it with an organic amine. The feed gas 3% SO2, by volume, and 95% of it is to be absorbed. The total gas rate is 150 m^{3}/h. at 20^{°}C and 1.1 bar absolute pressure. The liquid enters the column at rate of 1.40 kmol / h. Give:the overall mass transfer coefficient, KG=3.2*10^{-4} kmol/m^{2}.s. bar; the effective gas-liquid contact area =105 m^{2} per m^{3} of packed volume; slope of the equilibrium line, m=0.17 . Determine the number of overall gas-phase mass transfer units and the packed height if the column is 1 ft in diameter.
A metal ball (radius 2.5 cm) initially at a uniform temperature of 450°C is suddenly placed in a controlled environment in which the temperature is maintained at 100°C. The convective heat transfer coefficient is 10 W/(m² -K). Determine the time taken (in hours) for the metal ball to cool to 150 °C ? Clearly mention the suitable assumptions if necessary?. Property data are given below.
Property of all metal ball,unit ___________ value
Density, kg/m³_______7800
Thermal conductivity,W(m-°C)____35
Heat capacity, (J/kg-°C) 460
A composite wall is formed of a 2.5 cm copper plate (k=385 W/m-K). a 3.2 cm layer of
asbestos (k=0.2 W/m-K), and a 5 cm layer of fibreglass (k=0.045 W/m-K). The wall is subjected to an overall temperature drop of 560°C. Calculate the heat flux through the composite wall and also determine the temperature drop across the asbestos layer?
