B.TechSemester 62024-25Power System IiBEE601

Power System Ii (BEE601) - AKTU Question Paper 2024-25

B.Tech · Semester 6 · Free PDF Download

This is the official AKTU Power System Ii Previous Year Question Paper for B.Tech Semester 6, academic session 2024-25. Published by Dr. A.P.J. Abdul Kalam Technical University (AKTU/UPTU), Lucknow. Free PDF download — no login required.

Course:B.Tech

Semester:Semester 6

Session:2024-25

University:AKTU / UPTU

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Questions Asked in 2024-25

Power System Ii (BEE601) — extracted question text · 70 marks · 3 Hours

Section AAttempt all questions in brief. 02 x 7 = 14

a
During three phase fault which sequence component should be ca lculated? Explain with the reason
b
Explain the need of load flow analysis
c
Enumerate different types of buses and their significance in p ower system
d
A 100 kV surge travels on an overhead line with a surge impeda nce of 500 Ω, which is terminated by a cable with a surge impedance of 50 Ω. Calculate the magnitude of the reflected and transmitted voltage?
e
Enumerate five factors affecting the transient stability of po wer system
f
Classify relays based on their application
g
Differentiate between restriking and recovery voltage

Section BAttempt any three of the following: 07 x 3 = 21

a
A synchronous generator feeds bus 1 of a system. A power net work feeds bus 2 of the system. Buses 1 and 2 are connected through a transformer and a transmission line. Per unit reactances of the various components are: Generator (connected to bus bar 1): 0.25 Transformer: 0.12 Transmission Line 0.28 The power network can be represented by a generator with a reac tance (unknown) in series. With the generator on no load and with 1.0 pu voltage a t each bus under operating condition, a three-phase short circuit occurring on bus 1causes a current of 5.0pu to flow into the fault. Determine the equivalent reactance of the power network
b
Explain 𝑍஻௎ௌ building algorithms with all types of modification
c
Explain Bewley’s Lattice diagram. Prove the statement that a n open circuited line behaves as a leading power factor network
d
Derive power flow equations and prove that the reactive powe r flow in the transmission line is proportional to the difference between magnitudes of se nding end and receiving end voltages
e
Explain the working of overcurrent relay through neat diagra m

Section CAttempt any one part of the following: 07 x 1 = 07

a
Derive the expression for fault current of double line to gr ound fault and draw the related sequence networks
b
Design the positive, negative and zero sequence network of t he system shown in mentioned figure when a single line to ground fault (on phase a ) occurs on bus 1. Also calculate the fault current. The rating of the machines are 1200KVA, 600V with X՛ =X 2= 10%, X 0=5%. T1 is rated 1200KVA, 600V/3300V with leakage reactance of 5%, T 2 is rated 1200KVA, 3300V/600V with leakage reactance of 5%. The reactance of the t ransmission line are X1= X2=20% and X0=40% on the base of 1200KVA, 3300V. The reactance of the neutra l grounding reactors are 5% on the KVA and voltage base of the machine
a
The one line diagram of a simple four bus system is shown in mentioned figure. The line impedances are mentioned in the table. The shunt admittances at a l l t h e b u s e s a r e assumed to be negligible. (a) Find 𝑌஻௎ௌ if the line shown dotted is not connected. (b) What modifications need to be carried out in 𝑌஻௎ௌ if the line shown dotted is connected. Line, bus to bus R, pu X, pu
b
Explain the application of Newton- Raphson method for load f low studies. Enumerate its advantages/disadvantages over Gauss-Siedel method
a
A transmission line has an inductance of 16mH and a capacita nce of 0.1µf is connected to
a
cable which is having an inductance of 1.6H and a capacitance of 1mf. If a surge of 40kV is transmitted from transmission line towards the cable. Find: i. Transmitted voltage wave in cable ii. Transmitted current wave in cable iii. Reflected voltage and current waves iv. Incident current wave
b
Explain the concept of Surge Impedance Loading (SIL). Calcul ate the expression for maximum power during SIL. Write advantages of SIL
a
Explain equal area criteria to study transient stability. El aborate the stability when mechanical input suddenly changed with the help of equal area criteria
b
Derive the expression for effect of clearing time on stabili ty
a
Explain arc production, arc quenching/extinction and its met hods in circuit breaker
b
Explain following in detail: i. Fault clearing time ii. Relay time iii. Breaker time iv. Overreach v. Underreach

Question text is extracted from the official AKTU question paper PDF above. Check the original PDF for equations, diagrams and complete wording. Extracted: 2026-08-23.

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