WBUT 2013 BASIC ELECTRONICS ENGINEERING Question Paper Code [CS/B.Tech (OLD)/SEM-2/EC-201/2013]

CS/B.Tech (OLD)/SEM-2/EC-201/2013

2013

BASIC ELECTRONICS ENGINEERING

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 Questions )

1. Choose the correct alternatives for the following : 10 × 1 = 10

i) The unit of mobility of charge carriers in SI unit is

         a) Ωm            b) m²V^-1s^-1

         c) m²Vs^-1          d) m²V^-1s^-2

ii) Emission co-efficient for Si is

               a) 1          b) 3

               c) 2          d) 4.

iii) If β = 200 then α will be

          a) 0·99           b) 0·98

          c) 0·95           d) 0·96.

iv) A differential amplifier has a differential gain of 20,000.

CMRR = 80 dB. The common mode gain is given by

         a) 2             b) 1

         c) 0·5          d) 0.

v) When both junctions are forward biased the transistor

region operates in

           a) active region           b) cut-off region

            c) saturation region    d) inverted region.

vi) The input offset current is equal to the

         a) difference between two base currents

         b) average of two base currents