2nd sem dip electrical circuits - may 2010.pdf
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SECTION - I(a) Fill in the blanks :
(i) Unit of mutual inductance is _.(ii) Instantaneous value of voltage is given by the equation(iii) Current behind voltage by 90' in h pure inductance.(iv) Line current is equal to in 3-phase star connected
system.(v) For transmitting
material requiredsystem.
O) State and explain reciprocity theory.
SECTION _ II(a) Define the following :
(i) Active circuits(iD Passive circuits
(b) Explain the meaning of closed circuit and(c) Using star-delta transformation. Find the. below.
Code : 9EE-23
1x5:5
II Semester Diploma Examination, May 2010
ELECTRICAL & ELECTRONICS ENGINEERING BOARI)
ELECTRICAL CIRCUITS
Time:3 Hours I
Instructions: (1) Section -Iis compulsory.
I Max. Marks : 100
@ Answer any two full questions from each of the remaining Sections - tr, m &rv.
1.
sameis
amount of power, thein case of
amount of conductor3-phase than l-phase
42.
short circuit.total current for the circuit shown
[Turn over
10v
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3. (a)
(b)
State and explaip super position theory.
Verify super position theory for the NW shown below.
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t0v
(c) State Thevenin's Theory.
(a) Define the following and mention their unit :
(i) Magnetic flux(ii) Flux density
(b) State and explain Lenz's law.
(c) A wire of 1 meter length moves at right angle to its lcng& at 60 m/sec in auniform magnetic field of density 1 wb/m2. Calculde tre €mf induced in aconductor when the direction of motion(i) peryendieular to the field(ii) parallel to the field(iii) inclined at 30o to the direction of.the field-
SECTION - IIIState and explain Fleming's Right Hand Rule. :
Compare self induced EMF with mutually inducedEMF.
B,'when carryinga certain current, if the current is reversed in 02 sec wtiat is the averagevalue of EMF induced in a coil.
4.
I
II
i
:,,
5. (a)
o)(c)
6. (a) Define:(i) Self tnductance
(ii) Mutual lnductance
O) Derive an expression for the energy stored in a magnetic field.
(c) An iron cored electromagnet; has a length of 100 cm and a diameter of 4 cm.Calculate its inductance, if the coil has 2000 furni and also calculate theenergy stored, when the current rises from 0 to 10 A. Take F.:500 for iron.
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I
9EE-23
7. (a)
(c)
(b)
3
Draw sine wave and mark the following :
(i) Maximum value(ii) fve and -ve cycle(iii) Time period
Define the following :
(i) Phase
(ii) Phase Difference
A sinusoidal alternating current is represented by i:0.707 sin 520 t.Find (i) Max. value
(ii) Current when t : 0.002direction.
(iii) RMS value of current.
sec passing through zero in positive
8.
SECTION _ IV(a) Define the following :
(i) Resonant frequency(ii) Quality factor
(b) Perform the following operation :
IfA:10+j6B:30 + j 52
Find (i) A x B (ii) #in polar forms.
(c) An inductive coil takes a current of 33.24 Athe resistance of the coil is 6 C), calculate thepower taken by the coil.
from 230 V, 50 Hz supply, ifinductance of the coil and the
4
e. (a)
(b)
(c)
10. (a)
(b)
(c)
Define phase sequence.
Derive the relationship between voltage and current in store connection.Three 100 p resistors are connected in star across 415 volts, 50H2,3-phasesupply. calculate the line and phase current and the power consumed.
what are the advantages of 3-phase system over l-phase system ?Derive an equation for 3-phase power.
Each of the two wattmeter connected to measure the input to a 3-phasecircuit reads 20 kw. what does each instrument reads, when the p.f. is b.aooleggng with the total 3-phase power remaining unchangeo in the alteredcondition.
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