Sathyabama University Basic Electrical Engineering 2014 Question Paper

University: Sathyabama University

Course: B.E, B.Tech Degree Examination

Departments: BME/CHEM/CSE/E&C/ECE/EEE/EIE/ETCE/IT

Subject: Basic Electrical Engineering
Sub. Code :6C0009(2008/2009)
Exam Date: 10th December 2014

Register Number:

                               

SATHYABAMA UNIVERSITY

(Established under section 3 of UGC Act,1956)

Course & Branch :B.E/B.Tech - BME/CHEM/CSE/E&C/ECE/

EEE/EIE/ETCE/IT

Title of the Paper :Basic Electrical Engineering           

Max. Marks:80

Sub. Code :6C0009(2008/2009)                                     

Time : 3 Hours

Date :10/12/2014                                                            

Session :FN

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                                       PART - A                    (10 x 2 = 20)

                        Answer ALL the Questions

1.       Define Electrical Power and Energy.  

2.       Define Electrical Resistance and give its unit.

3.       What is fringing effect?

4.       A conductor of length 1m moves at right angles to a uniform magnetic field of flux density 1.5 wb/m², with a velocity of 50 m/sec. calculate the emf induced in it.

5.       For the circuit shown in fig. find the impedance in ohms.

6.       Write down the expression for power factor in two wattmeter method.

7.       What is the need for control torque in analog measuring instruments?

8.       Compare moving coil and moving iron in measuring instruments?

9.       Why is earthing provided for electrical appliances?

10.     What is insulator and give its types?

                                                 PART – B      (5 x 12 = 60)

Answer All the Questions

11.     Four resistors are in parallel. The current in the first three resistors are 4A, 5A and 6A respectively. The voltage drop across the fourth resistor is 200V. The total power dissipated is 5KW. Determine the values of resistances of the branches and the total resistance.

(or)

12.     Determine the value of R if the power dissipated in 10 ohms resistor is 90W.

FIG – 4

13.     (a)  Compare Magnetic circuits & Electric circuits.

          (b)  An iron ring has a cross-sectional area of 400mm² and a mean diameter of 20 cm. It is wound with 500 turns. If the value of relative permeability is 250, find the total flux set up in the ring. The coil resistance is 480 ohms and the supply voltage is 240 V.

(or)

14.     (a) A mild steel ring having a cross-sectional area of 500mm² and a mean circumference of 400mm has a coil of 200 turns wound uniformly around it. Calculate (a) reluctance of the ring and (b) the current required to produce a flux of 800µwb in the ring. Assume relative permeability of mild steel to be 380.

          (b) Explain the types of induced emfs.

15.     A coil of 10 ohms and inductance of 0.1H in series with a 150µF capacitor across 200V, 250HZ supply. Calculate (i) inductive reactance, capacitive reactance and impedance of the circuit (ii) current (iii) power factor(iv)voltage across the coil and capacitor respectively.

(or)

16.     A balanced three phase load consists of 6 ohms resistor & 8 ohms reactor (inductive) in each phase. The supply is 230V, 3 phases, 50HZ. Find (a) phase current (b) line current (c) total power. Assume the load to be connected in star & delta.

17.     Explain with the help of a neat sketch, the principle of working of a PM Moving Iron instrument.

(or)

18.     Explain construction and operation of a Induction type energy meter.

19.     Draw and explain the single line diagram of Transmission and distribution systems.

(or)

20.     What is meant by insulator and give its types in detail?

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