Electrical Engineering Answers

Two systems have the following equations of state, where RR is the gas constant per mole. The mole numbers are N1​ = 3 and N2​ = 5. The initial temperatures are T1​ = 175 K and T2​ = 400 K. What is the temperature once equilibrium is reached (in Kelvin)?
1/t1=3/2(R*N1/U1)
1/t2=5/2(R*N2/U2)​

A three-phase, 415 V load takes a line current of 800 A from a 3300/415V delta – star transformer. The 3300V system is supplied from an 11000/3300V star – star transformer. Draw the circuit diagram and, assuming no losses, find both line and phase values of voltages and currents in each part of the circuit. What will be the turns ratios of both transformers?

a unit negative feedback system has an open loop transfer function G(s)=k(1+s+s^2)/s(s+1)^3. determine the maximum value of k if the closed loop frequency response should never exceed 0db. Check the result using Matlab

An outward radial-flow impulse turbine has nozzles with a total effective area of 970mm^2 and the guide vanes make an angle of 20 to the tangent at exit.The inner and the outer diameter of the runner are 508mm and 712mm respectively,and the moving vanes have an outlet angle making 20 to the tangent.When running at 620 rev/min under a head of 61m the discharge is 1.8m/min and the power outlet is 11.9kW.The water is observed to leave the runner in a forward direction and inclined at 15 to the radius.Assuming the water leaves tangentially to the moving vanes,calculate the head lost in a) the nozzles b)the moving vanes c)bearing friction and windage

1.Asilicon pn-junction at T= 300K is doped at Nd =10^16 and Na=10^17. the junction capacitance is to be cj=0.8pf. when a reverse bias voltage of VR=5v is applied . find the zero-biased junction.

Let VPS =8V and VT=0.7V ,Assuming rf=0. calculate the value of R such that ID=1.20mA, if Vps is reduced to 4v and ohms is charged to 3.5k. determine the power dissipated in the diode

A silicon pn-junction at T= 300k has a reverse-saturation current of IS=10^16A determine the forward bias diode current for VD=0.55V

1.Asilicon pn-junction at T= 300K is doped at Nd =10^16 and Na=10^17. the junction capacitance is to be cj=0.8pf. when a reverse bias voltage of VR=5v is applied . find the zero-biased junction.

A piezoresistive accelerometer has the following properties and inputs:

Axial acceleration = 100 g’s

Maximum linearity error = 1%

Sensitivity = 0.5 mV/g

What is the maximum reading of the axial acceleration in mV that the accelerometer may measure? (Type in a one-decimal number)

A d.c. motor has the following spec: k×flux= 6.0v.s Vt= 10:0 V Ra= 1.5:00 Ia= 4:0 A (armature current at full load). Calc rated torque, starting torque; starting current at full voltage, starting speed; For Seperately excited and Shunt motor?