Electrical Engineering Answers

The unity feedback systems has the closed loop transfer function T(s) =k/(s+50)^2+k.Using root locus method. Determine the value of gain k so that the closed loop system has a damping ratio of √3/2.
Note : step by step solution required not using matlab.

The unity feedback system with loop transfer function is given as Gc(s)G(s)=50/s(s+40).Determine the bandwidth of closed loop transfer function.

Suppose you have the following circuit. The switch has been open for a long time, and is closed at time t = 0.

Assume V2 = 5V, R2 = 10 kΩ, L2 = 2mH, C2 = 0.1µF

The second order differential equation for the voltage across the capacitor is

d^2Vc(t)/dt + a1dVc(t)/dt + a2Vc = K

Minimize the following Boolean expression using Boolean identities
F(A,B,C,D,E) = A’B’C’D’+A’BC’D’+A’B’CD’+A’B’D’E+AB’CD+ABD’E’+ABD’E+AB’CDE

30mva 13.8kv 3-phase alternator has subtransient of 15% and negative and zero sequence reactances of 15% and 5%. The alternator supplies two motors over a transmission line having transformers.Motors rated inputs 20mva & 10mva both at 12.5kv with 20% subtransient reactances and negative & zero sequence reactances are 20% & 5% respectively. Current limiting reactors of 2ohm each in neutral of alternator of large motor.3 phase transformers are rated 35mva 21/132 kV delta/star with leakage reactance of 10%, series reactance of the line is 100ohm & zero sequence reactance of the line is 175 ohms. Use a base of 30mva and 22kv and determine the fault current when an L-L-G fault occurs at point P. Assume a prefault voltage of 138 kv

The rod OA in Fig . 12-33a rotates in the horizontal plane such that A = ( trad . At the same time , the collar B is sliding outward along OA so that r = ( 100+ ) mm . If in both cases / is in seconds , determine the velocity and acceleration of the collar when I = I s .

A latched-on SCR will stop conducting in which of the following conditions?

a. A gate voltage reduced to zero.
b. A gate receives negative trigger pulse.
c. The cathode becomes more positive than the anode.
d. The anode becomes more positive than the gate.

What's the approximate broadcast power of a VHF localizer antenna?

a. 1500 watts
b. 150 watts
c. 2 watts
d. 100 watts

What antenna length would be the best for signal frequency of 300Mhz?

a. 0.48 mtr
b. 0.96 mtr
c. 1.68 mtr
d. 1.36 mtr

A frequency of 108Mhz could be used for which aircraft application?

a. VHF comm.
b. Transponders
c. VOR
d. AM broadcasts