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Friday, November 30, 2012
EE604 ANSWER KEY EXAM HELD IN OCT/NOV 2012
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EE606 ANSWER KEY EXAM HELD IN OCT/NOV 2012
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EE 304 KEY EXAM HELD IN OCT/NOV 2012
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Saturday, November 17, 2012
DEPARTMENT OF ELECTRICAL AND ELECTRONICS
ENGINEERING
SUBJECT :-ELECTRICAL CIRCUITS (EE303) MAXIMUM MARKS :-80 QQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQ
PART A
NOTE J
Answer all the questions and each question carries three marks
J
Answer should be brief and straight to the point
1. (A) state maximum transfer theorem?
(B) Define active
circuit and passive circuit with examples?
2. (A) Explain ideal voltage source and ideal current source?
(B) State and explain Norton’s theorem?
3. (A) Define angular velocity and express the value in
terms of frequency?
(B)Explain the
working of simple loop generator?
4. (A) The two vectors are Z1 = 5-j2 and Z 2
=-3-j8 perform (i) Z1 + Z 2 (ii) Z1 - Z
2
(B) Perform the following operations
(i) Convert 8+j6 into polar? (ii) Convert 50<600 into rectangular?
5 Three currents I1 =20sin (wt); I 2=15sin
(wt+600); I3=12sin (wt+1200) flowing in a circuit. Calculate
the resultant current and express it in sinusoidal form?
6 (A) Define the term resistance, inductance and capacitance
(B) Define Q factor of a parallel resonant
circuit and write its formula
7 (A) what is resonant frequency and derive an expression
for resonance frequency in series circuit?
(B)Write down the
difference between series and parallel resonant circuit?
8 Two circuit having impedances Z1 = 10-j15 and Z
2 =-6-j8 are connected in parallel .If the total current
supplied is 15A. What is the power taken in each branch?
9. State the advantages of poly phase system over single
phase system?
10. (A) A balanced star connected load of (8+j6) per phase
is connected to a 3 phase 230v
supply. Find the line current, power and power factor?
(B) Explain the
term poly phase?
PART B
NOTE J
Answer any five the questions and each
question carries ten marks
J
Answer should be brief and straight to the point
1.(P) A coil of
resistance 5Ω and inductance 0.02H is connected in parallel with another coil
of resistance 1Ω and inductance of 0.08
H .The circuit is connected to 100V,50HZ supply.
Find (i) the supply current (ii) power factor
of circuit.
(Q) Three resistors
each of 100Ω are connected in star to a 415V 50 Hz find the line current (a)
with given conditions (b)when three
capacitors of each 100 micro Farad are shunted across each resistor
2 (P).Define (a) form factor (b) peak factor (c) average
value (d) RMS value
(Q) Perform the
following operations and put the result in polar form (i) A+B (ii)A-B (iii)AXB
(iv)A/B where A=6+j8,B=3-j4 ?
3. (P) Derive transformation formula for deta to star
transformation?
(Q)Derive
transformation formula for star to deta transformation?
4. (P) state and explain superposition theorem?
(Q) Find the current through 20Ω resistance
of network of fig 1. By using superposition theorem?
5. find the resistance between the X and Y of the networks
shown in figure 2 and3
6.(P) Two coils X and Y are connected in series across a
240V, 50hz supply. The resistance of coil X is 5Ω and the inductance of coil Y is
0.015H.If the input from the supply is 3KW and 2KVAR. Find the inductance of
coil X and resistance of coil Y.Calculate voltage across each coil.>
(Q) Show that in an
ac circuit containing pure inductance power is zero?
7. (P) A resistance
of 10Ω and inductance of 0.1H are connected in series across a supply of 220V, 50
Hz. Determine (a) The impedance (b) current flowing (c) power factor (d) the
phase angle between V and I
(Q)A coil of resistance 5Ω and inductance 0.02H is connected
in parallel with another coil of resistance 1Ωand 0.08H. The circuit is
connected to 100V, 50Hz supply .Find (i) the supply current (ii) power factor
of the circuit.
8. (P) State and explain Thevenins theorem?
(Q) A series
circuit, consisting of coil having a resistance of 30Ωand inductance of 0.5Hand
a capacitor resonate at a frequency of 48hz.calculate the capacitance of
capacitor which when connected in parallel with this circuit will increase the
resonant frequency to 60 Hz?
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