In this article we are going to provide Power System-I(Apparatus and Modelling) question paper solution. BEU pyq solution Electrical engineering. BEU power system 2022 pyq solution. Bihar engineering university previous year question solution of Electrical engineering 5th sem.
Q.1 Choose the correct answer of the following (Any seven question only):
[2 x 7 = 14]
(a) Ferranti effect on long overhead line is experienced when it is
(i) lightly loaded
(ii) on full load at unity pf
(iii) on full load at 0.8pf lead
(iv) on any load.
(b) For the flue gas flow, tick the correct sequence
(i) Boiler – ID Fan – Air preheater – Economizer – chimney
(1) Boiler – Air preheater – Economizer – ID Fan-chimney
(iii) Boiler – Economizer – Air preheater – ID Fan – chimney
(iv) None of the above.
(c) Single line diagram does not represents:
(i) Ratings of machines
(ii) Neutral wire of transmission lines
(iii) Delta connection of transformer winding
(iv) Star connection of transformer winding
(d) The function of a surge tank is:
(i) To supply water at constant pressure
(ii) To relieve water hammer pressures in the penstock pipe
(iii) To provide surge in the pipeline
(iv) None of the above.
(e) The length of medium Transmission line
(i) 0-80 Km
(ii) 80-160 Km.
(iii) more than 160 km
(iv) None of the above.
(F) Bundled conductors are used for EHV transmission lines primarily for reducing the: (f) Bun
(i) Corona loss
(ii) Surge impedance
(iii) Voltage drop
(iv) Skin effect
(g) The inductance of the line is minimum when:
(i) GMD is low
(ii) GMD is high
(iii) GMD is constant
(iv) None of these.
(h) Transient in synchronous generator is similar to which of the following circuit?
(i) Parallel RLC circuit
(iii) Series RLC circuit
(ii) Series RL circuit
(iv) Parallel RL circuit
(I) A 25 MVA, 33 KV transformer has a p.u. impedance of 0.9. The p.u. impedance at a new base 50 MVA at 11 KV would be
(i) 10.4
(ii) 12.2
(iii) 14.4
(iv) 16.2
(j ) Which type of Resistor is used for over voltage protection.
(i) Sensistors
(ii) Thermistors
(iii) Varistors
(iv) Inductor.
Q.2 (a) Three generators are rated as follows: Generator 1-100 MVA, 33 KV, reactance 10%, generator 2-150 MVA, 32kV, reactance 8%, Generator 3-110 MVA, 30 KV, reactance 12%. Determine the reactance of the generator corresponding to base values of 200 MVA, 35 KV.
(b) Find the A,B,C & D parameters of Nominal -T transmission line. Also draw its phasor diagram.
Q.3 (a) The 3 conductor of a 3-6 transmission lines are arranged in horizontal and 2m apart. The diameter of each conductor is 3cm. Determine inductance per km of each phase.
(b) Derive the expression of capacitance for a 1- transmission line. Explain the effect of Earth on the capacitance calculation of the overhead transmission line.
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Q.4 (a) Explain the working of Thermal power based electricity generation with proper diagram.
(b) What are the advantages of three-phase system. Explain the role of Reactive power in AC circuit.
Q.5 (a) How DC transmission system works? Explain with suitable connection diagram along with the function line-commutated converters and voltage source converters.
(b) Draw the I-V and P-V characteristics of PV pannels. Also draw the power curve of wind turbine with their application.
Q.6 (a) What are the possible connections for a 3-phase transformer bank? State the significance of the three-phase transformer group.
(b) Explain the working of Tap-changing transformers. Write its application in power system.
Q.7 Discuss in detail about the steady state performance characteristics of a synchronous machine operation, when connected to infinite bus and also real and reactive power capability curve of the generators.
Q.8 A generator transformer unit is connected to a line through a circuit breaker. The unit ratings are:
Generator: 15MVA, 11kV, X = 0.3 p.u., X=0.3 p. u., X = 0.6 p.u.
Transformer: 15 MVA, 12-7/66kV, reactance = 0.06 p. u.
The system is operating at no load at a line voltage of 132kV, when a three-phase fault occurs on the line just beyond the circuit breaker. Find –
(a) the initial symmetrical r.m.s. current in the breaker,
(b) the maximum possible d.c. offset current in the breaker;
(c) The momentary current rating of the breaker,
(d) The current to be interrupted by the breaker and the interrupting kVA;
(e) The sustained short-circuit current in the breaker.
Q.9 Write short notes on any two of the following: –
(a) Super heater and Economizer
(b) Surge Impedance Loading
(c) Per-unit system
(d) Wind Turbine.
BEU power system question paper 2022 = Download
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