Q-Bank_Electrical Power System-1-2150908

	CH:1 Supply System
1)	Draw and describe typical one line diagram for power supply scheme
2)	Write down comparison between A.C. and D.C.
3)	Prove different comparison between conductor material in overhead transmission line & underground transmission line.
4)	what are the factor to be consider during the economics of power transmission? OR Prove and define kelvin’s law with suitable graphical representation. Also write limitation of kelvin’s law.
	CH:2 Mechanical Design of Overhead lines
5)	Which are the properties of conductor material? Explain Commonly conductor materials to be used in overhead transmission line?  Why ACSR used in transmission line: Give your comment.
6)	Which are the properties of line supports? Explain the different line support used for transmission and distribution line of electric power.
7)	What is cause of insulation failure? Explain different types of insulator to be used in transmission and distribution line. Enlist the advance insulator to be used in modern power system.
8)	Why the voltage is not uniform over the string of suspension insulator string? Explain the string efficiency with mathematical expression. Enlist the method of improving the string efficiency.
9)	Define and calculate sag of overhead transmission line.
	Electrical Design of Overhead lines
	CH:3 Inductance and resistance of transmission line
10)	Derive the expression of loop inductance of single phase line.
11)	Derive an expression for inductance of 3-phase line when the conductors are symmetrically placed.
12)	Derive an expression for inductance of 3-phase line when the conductors are Unsymmetrically placed.
13)	Explain the term: Self GMD and Mutual GMD. Why it is not in capacitance calculation.
	Ch :4 Capacitance of transmission line
14)	Derive the expression of capacitance of single phase line.
15)	Derive an expression for capacitance of 3-phase line when the conductors are symmetrically and Unsymmetrically placed.
	Ch: 5 AC and DC Distribution
	Ø Distribution System General
16)	Classified Ac and DC distribution in brief with application.
17)	Comparison between overhead and Underground system.
18)	Which are the factors to be consider during distribution system. Explain connection schemes of different distribution system.
	Ø D.C. Distribution
19)	Example: Dc distributed at one end- 1) Concentrated Loading, 2) Uniformly.
20)	Explain D.C. distribution fed at both ends for concentrated loading.
21)	Explain ring main distributor with one example.
	Ø A.C. Distributor
22)	How the A.C.  distributor different form D.C. Distributor ? Explain the power factor of load current design w.r.t.  1) Vs & Vr, 2) Load voltage itself.
23)	Explain the four wire star-connected unbalanced loads.
	Ch: 6 Representation of power system component
24)	Explain one-line diagram in brief. What is P. U. system? Write advantages of per unit system.
25)	Explain the Equivalent Circuit model of Synchronous machine. From the first principal, derive Vt = Ef – Ia (Ra+ jXs) Where Xs = Xar + Xl. Also draw the equivalent circuit diagram.
26)	Explain per unit representation of transformer & three phase network.
	Ch : 7 Undergrounding cables
27)	Draw and Explain construction of underground cable.
28)	What are the properties of insulating material of underground cables? Explain insulating material used for making underground cables.
29)	In which parameter insulating material to be classified. explain the classification of underground cable with different voltage rating.
30)	How 3-phase cable classified with their services. Explain in brief.
31)	Write down the expression for insulation resistance of a single-core cable. OR Show the insulating resistance of cable is inversely proportional to its length.
32)	Give your comment: single core cable consider as equivalent to two long co-axial cylinders. Derive the expression for capacitance of single-core cable.
33)	What is dielectric stress? Explain dielectric stress in single-core cable.
34)	Explain Most Economical conductor size in a cable.
35)	Enlist the method to be used in achieving uniform dielectric stress in dielectric of cable. Explain in brief.
36)	Explain capacitance of 3-Core cable in underground cable.

Electrical Power System-1

Ch : 4 Representation of power System Components Material                  Click here to Down Load

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Q-Bank-PSA&S-150902_All Chapter_5th EE

Ch:-1 Current and Voltage Relations on a Transmission Line:

1.      From first principles, derive the A, B, C and D constants of a long transmission line.

2.      Derive the equation for active and reactive powers flow in transmitted to load over a long line.

3.      Starting from the first principles, show that surges behave as travelling waves. Find expressions for   surge impedance and wave velocity.

4.      What is importance of receiving end power circle diagram? Explain the  steps of constructing it.

5.      Derive expressions of voltage phasor and current phasor at any point of a long transmission line as function of distance x from receiving end in terms of distributed parameters of the line, voltage phasor VR (voltage at receiving end) and current phasor IR (current at receiving end). State difference between characteristic impedance and surge impedance of the line.

6.      What is an equivalent π and equivalent T circuit of a long transmission line?

7.      Derive the ABCD constants for medium transmission line using Nominal Π representation. Also write the expressions for voltage regulation and efficiency for the same line.

Ch:-2 System Modeling:

8.      What is importance of one line diagram of a power system? How it is drawn?

9.      Explain one-line diagram in brief. What is P. U. system? Write advantages of per unit system.

10.  Explain the Equivalent Circuit model of Synchronous machine. From the first principal, derive Vt = Ef – Ia (Ra+ jXs) Where Xs = Xar + Xl. Also draw the equivalent circuit diagram.

11.  With the help of neat phasor diagram, explain the operation of synchronous generator for different field excitation. 

Ch:-3 Symmetrical Three-Phase Faults:

12.  Draw the waveforms for fault current for a 3-phase fault on alternator     terminals.    Explain the sub-transient, transient and steady state reactance. What is their significance in fault calculations?

13.  Explain the importance of bus impedance matrix in fault calculation.

14.  How the circuit breaker is selected for any particular location. 

Ch:-4 Symmetrical Components:.

15.  Write a brief note on phase shift of symmetrical components in Y-Δ transformer banks.

16.  Write a note on zero sequence networks in brief.

17.  Derive the expressions of positive, negative and zero sequence voltage components in terms of given set of unbalance voltage phasors Va, Vb and Vc. Also prove that the transformation used is power invariant.

Ch:-5 Unsymmetrical Faults:

18.   Using appropriate interconnection of sequence networks, derive the equation for a line to line fault in a power system with a fault impedance of f Z

19.  Justify the following statement:

“For a fault at alternator terminals, a single line to ground fault is generally more severe than a 3-ph fault whereas for faults on transmission lines, a 3-ph fault is more severe than other faults.”

20.  Explain how fault current can be calculated when L-G fault occur through a fault impedance Zf.

21.  Draw a general circuit which can be used to determine zero sequence network of a two-winding transformer. Using this circuit, draw the zero sequence networks for (i) delta-star transformer with star point grounded. (ii) delta-delta transformer. (iii) star-star transformer with star point grounded.

22.  Derive an expression for the fault current for a double-line fault as an unloaded generator.

Ch:-6 Corona:

23.  Describe the phenomena of corona in brief. What are the factors and conditions affecting corona loss?

24.  Explain the advantage, disadvantage and method of reducing  phenomena of corona. 

Ch:-7 Neutral Grounding:

25.  What are the various methods of neutral grounding? Explain all. (resonant grounding)

26.  Explain neutral grounding using phasor diagrams.. Give Advantage of neutral grounding.

  

Ch:-8 Transients in Power Systems:

27.  Explain single and double frequency transient.

28.  Write a brief note on capacitance switching.

29.  Discuss the behavior of a travelling wave when it reaches the end of (i) open circuited (ii)short circuited transmission line. Draw diagrams to show voltage and current on the line before and after the wave reaches at the end.

    Combination

30. Give reasons for following:

1.      The analysis of unsymmetrical faults can be more easily done with the help of symmetrical components than by a direct solution of the unbalanced circuit.

2. A travelling wave suffers reflection when it reaches discontinuity.

3. The disruptive critical voltage is less than visual critical voltage.