Deemed University 2009 A.M.I.E.T.E Electronics

AMIETE – ET (OLD SCHEME)

Code: AE05 Subject: BASIC ELECTRONICS
Time: three Hours Max. Marks: 100

NOTE: There are nine ques. in all.
· ques. one is compulsory and carries 20 marks. ans to Q. 1. must be written in the space given for it in the ans book supplied and nowhere else.
· Out of the remaining 8 ques. ans any 5 ques.. every ques. carries 16 marks.
· Any needed data not explicitly given, may be suitably presumed and said.


Q.1 select the accurate or the best option in the following: (210)

a. The Hall effect voltage in intrinsic silicon

(A) is positive.
(B) is zero.
(C) is negative.
(D) modifications sign on application of magnetic field.

b. The main component responsible for lowering of gain in an R-C Coupled amplifier in Low Frequency range is

(A) Biasing system. (B) Resistor RE.
(C) Coupling capacitor CC. (D) Transistor itself.

c. A Source Follower using a FET usually has a voltage gain which is

(A) greater than +100. (B) slightly less than unity but positive.
(C) exactly unity but negative. (D) About -10.

d. Class-AB Operation is often used in Power (Large Signal) amplifiers in order to

(A) get maximum efficiency. (B) remove even harmonics.
(C) overcome cross-over distortion. (D) decrease collector dissipation.

e. An Amplifier with no feedback has a gain-bandwidth product of four MHz. Its closed- Loop gain is 40. The new bandwidth is

(A) 100 KHz. (B) 160 MHz.
(C) 10 MHz. (D) 20 KHz.

f. Which of the subsequent Oscillators is capable of giving highest Q-factor?

(A) Hartley Oscillator. (B) Tuned Oscillator
(C) Crystal Oscillator. (D) Wein-Bridge Oscillator.




g. The OP-AMP circuit shown

Earning:   Approval pending.