# WBUT Basic Electrical and Electronics Question Paper

## Basic Electrical Engineering

West Bengal University of Technology

CS/B.TECH (NEW)/SEM-1/ES-101/2010-11 2010-11

BASIC ELECTRICAL & ELECTRONICS ENGINEERING-I

Time Allotted : 3 Hours                                       Full Marks : 70

THIS QUESTION BOOKLET CONSISTS OF 2 PARTS — PART I & PART II.

The figures in the margin indicate full marks.

Candidates are required to give their answers in their own words

as far as practicable.

PART – I ( Marks : 35 )

GROUP – A ( Multiple Choice Type Questions )

1. Choose the correct alternatives for any five of the following :

5×1=5

i)       The form factor of a wave is 1. Its shape is a) sinusoidal         b) triangular

c) square                           d) sawtooth.

ii)       The admittance of a parallel circuit is 0-5 Z – 30°. The circuit is

a) inductive                       b) capacitive

c) resistive                         d) in resonance.

iii)     The force experienced by a small conductor of length L, carrying a current I, placed in a magnetic field B* at an angle 0 with respect to B* is given by

a)                                                               BIL    b) BIL sin 0

c) BIL cos 0                        d) zero.

iv)      The mutual inductance between two coupled coils is 10 mH. If turns of one coil are doubled and that in other are halved, the mutual inductance will be

a)                                                               5 mH b) 10 mH

c) 14 mH                           d) 20 mH.

v)        Three resistors of 4Q, 6 Q and 8 £2 are connected in

parallel. The maximum power dissipation will occur in

– i

a)                                                               4 Q      b) ? 6 Q

c) 8(2                                 d) equal in all resistors.

a)

5 V, lOfl  b) 10 V, 10 ft

c) 5V.5Q                         d) 15 V, 15-ft.

GROUP -B ( Short Answer Type Questions )

Answer any two of the following. 2×5= 10

1. State and prove maximum power transfer theorem.
2. Compare electric and magnetic circuits with respect to their similarities and dissimilarities.
3. What is resonance ? Deduce the expression of frequency in a series RLC circuit at resonance.
4. At t = 0, the instantaneous value of a 50 Hz, sinusoidal current is 5 Amp and increases in magnitude further. Its R.M.S. value is 10 Amp.

a)       Write the expression for its instantaneous value

• i

b)        Find the current at t= 0-01 and t = 0-015 sec

Sketch the waveform indicating these values.

WBUT Basic Electrical and Electronics Question Paper for SEM I

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