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Posted By: Sree.... Member Level: Diamond Posted Date: 24 May 2008
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2007 Andhra Pradesh State Jawaharlal Nehru Technological University B.Tech BASIC ELECTRICAL ENGINEERING Set No. 1 Question paper
Code No: R05010501 Set No. 1
I B.Tech Regular Examinations, Apr/May 2007
BASIC ELECTRICAL ENGINEERING
( Common to Computer Science & Engineering, Information Technology
and Computer Science & Systems Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) State and explain Kirchoff’s Laws?
(b) Calculate the magnitude and direction of current in the 10 ohms resistor.
as shown in figure 1 that the power delivered by source is equal to power
dissipated in the resistors. (All resistance are in ohms). [6+10]
Figure 1
2. (a) Obtain an expression for the voltage drop across an inductance
(b) An air cored toroidal coil has 450 turns and a mean diameter of 30 cm and
a cross sectional area of 5cm
2. Calculate the inductance of the coil and the
average induced e.m.f if a current of 4 Amp is reversed in 60 milliseconds.
[6+10]
3. A 600 - turn coil is wound on the central limb of the cast steel frame as shown in
figure 3. A total of 1.8 × 10-3 wb. is required in the air gap. Find out the current
required in the coil. Assume gap density is uniform, and that all flux lines pass
straight across the gap. [16]
Figure 3
4. (a) Define the following
1 of 2
Code No: R05010501 Set No. 1
i. Alternating Quantity
ii. R.M.S. Value
iii. Average value
iv. Form factor.
(b) A coil having a resistance of 10 ohms and an inductance of 0.2H is connected
in series with a 100×10-6 F capacitor across a 230V, 50Hz supply, Calculate
i. The active and reactive components of the current
ii. the voltage across the coil, Draw the phasor diagram. [8+8]
5. (a) What is an ideal transformer Draw its no load phasor diagram.
(b) The primary winding of a 50 HZ single phase transformer has 480 turns and is
fed from 6400 V supply. The secondary winding has 20 turns. Find the peak
value of flux in the core and the secondary Voltage. [8+8]
6. What is the principle of operation of a dc generator ? Why is commutator and
brush arrangement necessary for the operation of dc generator. [16]
7. Explain with the help of suitable diagrams how rotating magnetic field is produced
in a three phase induction motor. [16]
8. (a) Discusss the classification of electrical instruments.
(b) Explain the significance of controlling torque and damping torque relevant to
the operation of indicating instruments. [8+8]
? ? ? ? ?
2 of 2
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