B.TechSemester 62024-25Power System IiBEE601
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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) — complete question paper · 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. Hindi translations are omitted — every question is printed in English in the original paper. Last verified: 2026-08-23.

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