2015 ELECTRICAL SCIENCE
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1 Summer 2015 ELECTRICAL SCIENCE TIME: THREE HOURS Maximum Marks : 100 Answer five questions, taking ANY TWO from GROUP A, ANY TWO from GROUP B and from GROUP C. All parts of a question (a,b,etc) should be answered at one place. Answer should be brief and to-the point and be supplemented with neat sketches. Unnecessary long answer may result suitably giving proper justification. Figures on the right hand side margin indicate full marks. Group A 1. (a) Define the terms: Electric flux. Electric flux density and electric charge density. (3x2) (b) Electric line of force never cross - why? (4) (c) Find currents in all branches of the circuit in Fig.1 using mesh current analysis (10) 2. (a) An a.c voltage j 120 V is applied to a circuit. The current is 4 + j 10A.Find impendence, active power, reactive power and power factor. (4x3) (b) What is series resonance? (4) (c) What is the significance of power factor? 3. (a) Explain the terms mutual inductance and coefficient of coupling (4+4) (b) What is eddy current loss? How can it be reduced? (6) (c) An aeroplane, having a wing span of 52 m, is flying horizontally at 1100 km/h. If 6 vertical component earth s magnetic field is T,find emf induced between the wing tips (a) Differentiate between balanced and unbalanced circuits. 5 (b) A star connected three-phase load has a resistance of 6 Ω and inductive reactance of 8 Ω in each branch. Line voltage is 220 V. Write phasor expression of voltage across each branch, line voltage and line currents. Find total active power. (15) GROUP B 5. (a) Distinguish between radial and ring distributors. (6) (b) A 230 V d.c. source feeds three loads, each taking 50 A. Loads A,B,C are connected to source through 0.05 Ω, 0.1 Ω and 0.02 Ω resistance cables. A is joined to B through, 0.1 Ω resistance cable and B to C through 0.15 ohm cable. Find voltages at loads A, B and C. (14) 6. (a) Discuss the effect of core loss and magnetic leakage on the performance of transformer. (6) (b) What is turn ratio of transformer? What is its significance? (4)
2 (c) Draw and explain phasor diagram of a two winding transformer (a) Derive torque equation of d.c machine. 5 (b) Differentiate between shunt, series and compound d.c machines 5 (c) Discuss the process of self-excitation in a d.c shunt generator. 5 (d) what are the conditions to be met for parallel operation of d.c machines? 5 8. Write short notes on the following : (4x5) (a) Starting of induction motor. (b) Single phase induction motor (c) Types of alternators (d) Use of commutator machines GROUP C 9. Answer the following in brief: (10x2) (i) What is a dipole? (ii) What is the difference between loop analysis and node analysis? (iii) What is hysteresis loss? (iv) What is meant by relative permeability? (v) What is the importance of phase sequence? (vi) List application of transformers? (vii) What is meant by rotating field? (viii) What is synchronous impedance? (ix) Write some applications of single phase induction motor. (ix) Why should speed of an alternative be kept constant?
3 W'13:7AN:AN 210 (1410) ELECTRICAL SCIENCE Time : Three hours Maximum Marks : 100 Answer FIVE questions, taking ANY TWO from Group A, ANY TWO from Group B and ALL from Group C. All parts of a question (a,b.etc.) should be answered at one place. Answer should be brief and to-the-point and be supplemented with neat sketches. Unnecessary long answers may result in loss of marks. Any missing or wrong data may be assumed suitably giving proper justification. Figures on the right-hand side margin indicate full marks. Group A 1. (a) State and explain Coulomb's law. Define permittivity, absolute permittivity and relative permittivity (b) Three chatges each of 2 x 1 o-s C are placed at the three comers of an equilateral triangle each of side 2 m. Find the force on any one charge due to the presence of other two charges. 8 (c) What i~ meant by electric flux density? 4 2. (a) What is a B-H curve? What is its use? (b) An air cored coil has 400 turns. The mean length of magnetic flux path is 60 em and area of cross-section is 5 cm 2 The exciting current is 5 A. Find H, Band flux near the axis of the coil
4 (c) Write some applications of relays. 3. (a) In the circuit, shown in Fig. 1, rmd voltage V and show that power consumed by resistances is equal to power supplied by batteries. 8 I4ovT I 20!1 60 I Fig. 1 t v I (b) Define the terms mesh and node. (c) State and explain Kirchhoff's laws. 50 T 90V (a) An inductor coil takes 10 A and dissipates I 000 W when fed from 250 V 25Hz supply. Find the impedance, resistance, inductance, and power factor of the coil. 8 (b) Differentiate between balanced and unbalanced three-phase loads. 4 (c) How is the power consumed in a three-phase circuit measured? Show the wattmeter connection and the power relation. 8 Group B 5. (a) What is an ideal transformer.? (b) A 230/110 V single ph~se transformer takes 350 VA at no load and rated voltage. Core loss is 110 W. Find magnetising current and no load power factor (c) Draw and explain the phasor diagram of a two winding transformer. 8 (d) Define voltage regulation of transformer (a) Differentiate between series and shunt d.c. generators. (b) A 60 hp 230 V d.c. shunt motor has an armature resistance of 0 05 ohm and field circuit resistance of 46 ohm. The no load speed is 1000 rpm. Find the speed when t..l!e line current is 75 A. Assutne t..l!at t..he motor has compensating winding. (c) Derive an expression for emf induced in d.c. machine (a) What is meant by slip of induction motor? 4 (b) Explain the methods of starting of three phase induction motor. 8 (c) How can ~ynchronous impedanc~ of an alternator be found? (a) A 230 V source feeds three loads A, B, C each taking 50 A. Loads A, B, Care. connected to source through 0 05 Q, 0 1 Q and 0 02 resistance cables. A is joined to B through 0 1 Q cable and B to C through 0 15 Q cable. Find voltages at loads A, Ban~ C. (b) Discuss advantages and disadvantages of radial and ring main distributors. 6 (o) Compare single phase and three phase system of distribution
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