Download AKTU B-Tech 1st Sem 2015-2016 EEE 101 Electrical Engineering Question Paper

Printed Pages : 6 1159/1160 EE-101/EEE-101

(Following Paper ID and Roll No. to be filled in your Answer Book)

Paper ID: 121111/

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Roll No.

121121 B.Tech.

(SEM. I) THEORY EXAMINATION, 2015-16

ELECTRICAL ENGINEERING

Time : 3 hours] [Total Marks : 100

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Section-A

1. Attempt all questions. (2×10=20)
1. Define linear and non-linear elements.
2. In an a.c. circuit the supply voltage and current is given as: v= 200 sin 314t and i =5sin (314t-II/3). Find the real power of the circuit.
3. Draw the resonance curve for series resonant circuit and indicate fr, f1, f2, on the curve.

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4. What is the principle of superposition?
5. For a single phase transformer, if iron losses are 1000W and the full load copper losses are 1500W, then at what percent load, the transformer will yield maximum efficiency?
6. Calculate the value of equivalent star connected resistances if 3 resistances each of 90 are connected in delta.
7. Draw the single line diagram of electrical power system.
8. Draw the speed Torque characteristics of D.C. Shunt motors.

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9. Draw the schematic diagram of long shunt type cumulative compound dc motor.
10. Considering RYB as positive phase sequence write the type of phase sequence for the following phase combinations: BRY, RBY, BYR, and YBR.
11. A 30, 60 Hz, Induction motor has 6 poles and operates with a slip of 5% at a certain load Determine a) The speed of the rotor w.r.t. stator. b) The frequency of the rotor current. c) The speed of the rotor magnetic field w.r.t. rotor. d) The speed of the rotor magnetic field w.r.t. stator. e) The speed of thr rotor magnetic field w.r.t. the stator magnetic field.

Section-B

2. Attempt any five questions. 10×5=50

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2. State Thevenin's theorem. Draw the Thevenin's equivalent circuit of Fig-1.

3. State and prove Maximum Power Transfer theorem. Illustrate the theorem by solving a circuit of your choice.
4. Draw and explain torque-slip characteristics of a three phase induction motor.
5. Derive the expression for line voltage and phase voltage, line current and phase current, active power, reactive power and apparent power for a star (Y) connected system with suitable circuit and phasor diagrams.
6. A 30 kVA, 2000/200V, single phase, 50 Hz transformer has R1 = 3.5 ohms, X1 = 4.5 ohms and R2 = 0.035 ohms X2= 0.02 ohms. Find the equivalent resistance, reactance and impendance of transformer referred to primary side and secondary side. Also find total copper losses.

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7. Calculate the current in R4 by using Nodal analysis in fig-2.

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