(AUTONOMOUS)
B. Tech I Semester Regular/Supplementary Examinations, December 2017
(Regulations: VCE-R15)
BASIC ELECTRICAL ENGINEERING
(Common Computer Science and Engineering, Information Technology,
Electronics and Communication Engineering Electrical and Electronics Engineering)
Date: 29 December, 2017
Time: 3 hours
Max Marks: 75
Answer ONE question from each Unit
All Questions Carry Equal Marks
Unit I
1.

Find the current IL using source transformations.
Fig.1
8M

Determine the total resistance and current in the circuit shown in Fig.2.
Fig.2
7M
2.

State and explain:
i. Kirchhoff's laws
ii. Dependent and Independent sources
8M

Determine the value of current in the branch BE circuit shown in Fig.3 applying Kirchhoff's law.
Fig.3
7M
Unit II
3.

Three resistances 2r and 3r are connected in delta. Determine the resistances for an equivalent star connection.
6M

Find the voltage across 1Ω resistor and current through 2Ω resistor for the circuit shown in Fig.4 using nodal method.
Fig.4
9M
Cont…2

4.

Explain basic cut set and tie set matrices with an example.
7M

Determine the current in the 5 ohm resistor in the network shown in Fig.5.
Fig.5
8M
Unit III
5.

Derive average and RMS value of a sine wave and cosine wave in terms of maximum value.
8M

The circuit, having two impedances of Z1= +J15)Ω and in parallel, is connected to a single phase AC supply as shown in Fig.6 and the current drawn is 10A. Find I1 and I2.
Fig.6
7M
6.

Obtain the relationship between current through and voltage across a pure capacitor applied to a sine wave. Draw the Phasor diagram.
7M

A resistor of 50Ω in parallel with an inductor of 30mH, is connected in series with a capacitor, C as shown in Fig.7. A voltage of 230 50 Hz is applied to the circuit. Find:
i. The value of C to give unity power factor
ii. The total current
iii. The current in the inductor
Fig.7
8M
Unit IV
7.

Explain Thevenin's theorem with an example.
8M

Find the value of resistance R in the circuit shown in Fig.8 to have maximum power transfer. Also obtain the amount of maximum power.
Fig.8
7M
Cont…3

8.

Explain Millman's theorem with an example.
8M

For the circuit shown in Fig.9 calculate the current in 6Ω resistor by using Norton's theorem
Fig.9
7M
Unit V
9.

Explain hybrid parameters with necessary equations.
7M

Find the Z parameters for the circuit shown in Fig.10.
Fig.10
8M
10.

Find the relation between Transmission parameters (ABCD) and Y parameters.
7M

The Z parameters of a two port network are z11=10Ω, z22=15Ω, z12=z21=5Ω. Find the equivalent ABCD parameters.
8M