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INDIAN INSTITUTE OF TECHNOLOGY

Date:

Time: 2 Hours

Full Marks: 60

No. of Students: 632

Spring Semester 2013-2014

Department of Electrical Engineering Sub. No.: (EE11001)

I Yr. B. Tech., Dual Degree

Subject Name: Electrical Technology

Instructions: Answer ANY FIVE Questions

1. (a) In the network shown in Fig. 1a, calculate the equivalent resistance between 'A' and 'N'.

(4)

1. (b) In Fig. 1b, power dissipated in the circuit is 2.5 kW. Find the value of the resistance Rx.

(2)

A

380

150

100

Rx

'-------+-11,1--_-----l

cr

250V

...,.B

IV\N

Fig.1a

I.

( c ) Find the currents i 1,

Fig. 1b

h, h and i4 as shown in the Fig. 1c.

A

(6)

B

i4

Fig. 1c

2. (a). Calculate the potential difference, VAB, across the 2 .Q resistances in the network, shown

in the Fig. 2a, using Superposition theorem.

(5)

4!1

8!1

+

-=-20V

lOV-=-

A

Fig. 2a

1

2. (b) In the Fig. 2b, RL is a variable load resistance. Find the Norton's equivalent of the circuit across the

(2+2=4)

terminal A-B

Determine the value of resistance, RL, and the potential difference, V AB, when the load receives the

(1+2=3)

maximum power.

5A'

3A

RL

Fig. 2b

3. (a) Calculate the (i) R.M.S. and (ii) Average value ofthe waveform v(t) shown in Fig.3a. (2)

3. (b) In Fig. 3b, the switch, S is closed at t=O after the circuit had reached steady state. Find

v~~

·

w

Voltage (V)

500

s

v+

2000

Time (s

Fig. 3a

Fig. 3b

3. (c) Refer to the circuit shown in Fig. 3c. At t=Othe switch S 1 is changed from position A to

position B and at the same time the switch S2 is disconnected from position C. Consider the

following: c!iL "·

dt \.0-) = 4A I SeC.; VL(O +) "':." 16V;

. . L)

it (t = i · = 9.06A;

(t=

~) = 1Ajsec. Find the following (i) iL(O-); (ii) Value ofL; (iii) Value ofR ;(iv)

at

R)

Value ofV; and (v) Energy delivered by the current source between t=O tot= oo.

diL

(1.5+1.5+ 1.5+ 1.5+2=8)

t=O

R

Fig. 3c

2

- - - - - ------ -----

~·

4. (a) Find the current, I, through 10 n...