Test: Power Systems- 3 - Electrical Engineering (EE) MCQ

The sequence voltage of a 3φ system is given as

0.87 pu = V_a1
-0.33 pu = V_a0
-0.54 pu = V_a2
What is the phase voltages on 11KV

An unsymmetrical fault on a transmission line gives the sequence voltage and sequence current

V_a1 = 0.837 pu
V_a2 = -0.45 pu
V_a0 = -0.2 pu
and sequence current I₁ = I₂ = I₀ = -j1.2 pu. What is the type of the fault.

What is fault impedance value on the base of 11KV, 20 MVA

|V₁| = |V₂| =1pu , what is the maximum power flow in this Network.

In which of the following condition the system is stable (ω is speed)

An alternator having E = 1.2 pu connected to ∞ bus through a power network. The transfer reactance between alternator and ∞ bus before fault, during fault, and after clearing fault are X₁ = 0.5, X₂ = 2.0, X₃ = 1.5 pu. If initially P_m0 = P_eo = 1 pu then what is δ_cr made by rotor such that system is stable?

A 50 bus system with 200 transmission line. How many zeroes are in Y bus matrix.

For a 3 bus network

a shunt capacitor of -j0.5 is added at 2^nd bus, Y₂₂ new = ?

A Network having postive, negative and zero sequence bus impedance matrix as

what is the LG fault current at bus 2 with z_f = j0.1 pu. Pre-fault voltage at bus 2 is 1.05 pu

A 3φ load of 50 MW, 0.6 pf, is operating at 33KV, what is capacitance per phase required by the capacitor bank connected in Δ to improve pf to 0.8 lag.

what is reactive power support required at bus 2.

A Network containing 20 voltage controlled bus, 10 reactive power support bus, a generator bus, 5 fixed shunt capacitance bus, total voltage controlled bus is

A transmission line of length 300 km operating at 50Hz, the receiving end voltage under no load V_S = 1pu is

A transmission line of length 600km, has a phase shift in degree of

A generator having H = 6 MJ/MVA is connected to generator having H = 4 MJ/MVA. A fault reduce the pr. out put to 0.6 pu which was initially 1 pu. Find angular acceleration in elect degree/S²

A transmission line has impedance (3 + j4) Ω/phase. The power factor of the load for maximum V.R.

A 3φ transmission line has ABCD parameters as A= 0.75 ∠0° = D, B = 100∠90°Ω, C = 0.5 x 10^-6 ∠90° ℧ operating at V_s = 200 KV, V_R at no load, and shunt reactor for compensating Ferranti-effect 

In previous question, the charging current at no load is_____

A TL has z_S = 400Ω is terminated with a cable with z_L = 50Ω. A rectangular pulse of 100KV is travelling towards the cable. The transmitted volt will be

A 3φ transmission line having a surge impedance of 400Ω is operating at 400 KV line is compensated with 30% of shunt capacitor at the load end. The other end is connected to a generator which is delivering power at 200 MW. SIL of the above system is

In above question, SIL after compensation is

A TL supported by 3 insulation disc, the maximum voltage of each disc is 25 KV. Find the operating voltage per phase of the line given efficiency η = 78%