WBUT 2013 ELECTRIC CIRCUIT THEORY Question Paper ( Paper Code EE-301)

Electrical Engineering

CS/B.TECH/(EE/EEE/PWE/ICE)-(New)/SEM-3/EE-301/2013-14

2013

ELECTRIC CIRCUIT THEORY

Time Allotted : 3 Hours                                    Full Marks : 70

The figures in the margin indicate full marks.

Candidates are required to give their answers in their own words

as far as practicable.

GROUP – A

(Multiple Choice Type Question)

1.       Choose the correct alternatives for any ten of the following:
                                                                                               10 x 1 = 10

          i)        Unit step function is first derivative of

                   a)       Ramp function               b)       Impulse function

                   c)       Gate function                 d)       Parabolic function.

          ii)       A practical current source is usually represented by

                   a)       a resistance in series with an ideal current source

                   b)       a resistance in parallel with an ideal current source

                   c)       a resistance in parallel with an ideal voltage source

                   d)       none of these.

          iii)      A two-part network is defined by the relations
                   I1=2V1+V2 and I2=2V1+3V2 , then Z12  is

                   a)       -2 ohm                           b)       -1 ohm

                   c)       -12  ohm                       d)       -14  ohm.

          iv)      The Z matrix of a 2-port network is given by
                   0.90.20.20.6 . The element Y22  of the corresponding Y matrix of the same network is given by

                   a)       1.2                                 b)       0.4

                   c)       -0.4                                d)       1.8