Download BBA IInd SEMESTER EXAMINATION 2008-09

Diploma in Engineering (Lateral) IV (Fourth)
Semester Examination 2011-12
Course Code: DEE474
Paper ID: 0744105
Electrical Circuits and Analysis
Time: 3 Hours
Max. Marks: 60
Note: Attempt six questions in all. Q. No. 1 is compulsory.
1.
a)
b)
c)
d)
e)
f)
g)
h)
Answer any five of the following.
(3x5=15)
What is resonance power factor in parallel R-L-C circuit?
Calculate the open circuit voltage in the network that have 50
v dc source with series resistance of 38k ohm.
Sate the superposition theorem? Is possible to calculate
power using this theorem?
State the Norton’s theorem along with the process of
calculation of Norton’s equivalent resistance with
independent source.
Why series resonant circuit is called as an accepter circuit
and parallel resonant circuit as a rejecter circuit?
Three sinusoidal voltages acting in series are given by
V2  10 2 sin( 440t  45)
and
V1  10 sin 440t ,
V3  20 cos 440t then determine the frequency and rms value
of resultant voltage.
A metal filament lamp, rated at 750W, 100V is to be
connected in series with a capacitance across a 230V, 50Hz
supply. Calculate the value of capacitance required. Draw the
phasor diagram.
Define the term selectivity in reference to parallel RLC
circuits.
2.
Explain the two wattmeter method to measure the power in
three phase ac circuits.
(9)
3.
Derive the resonance condition for series RLC circuit.
(9)
4.
A coil with a resistance of 10W and an inductance of 125mH
is connected in series with a 60m F capacitor across a 120V
supply. At what frequency does resonance occur, find the
current flowing at the resonant frequency?
(9)
5.
Derive the power factor and impedance for parallel RLC
circuits.
(9)
6.
State and derive maximum power transfer theorem for d.c.
networks.
(9)
7.
By using superposition theorem, calculate the current in the
arm R3.
(9)
Figure….
8.
For a given Star network, convert it to its equivalent Delta
network, if RA=6 ohm, RB=2 ohm, RC=3 ohm.
(9)
Figure…