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

in Fig.1 is


(A) An Integrator.
(B) An Adder.
(C) A Differentiator.
(D) A Comparator.


h. The output time period of a transistorized monostable multivibrator using base resistor Rb and coupling capacitor Cb for the output transistor is provided by

(A) Rb Cb (B) 0.69 R­b Cb.
(C) two Rb Cb (D) 1.38 Rb Cb.

i. If the output voltage of a Bridge Rectifier is 100 V, then the PIV of diode will be

(A) 100 V. (B) V.
(C) 100 V. (D) 100 V.

j. The gates needed to build a Half-Adder are

(A) EX-OR Gate and NOR Gate.
(B) EX-OR Gate and OR Gate.
(C) EX-OR Gate and AND Gate.
(D) 4 NAND Gates.


ans any 5 ques. out of 8 ques..
every ques. carries 16 marks.


Q.2 a. If the impurity content of either or both the P and the N-region is increased, what happens to the Potential Barrier, and why? Does the temperature affect the Potential Barrier? discuss. (8)

b. describe Transistor Characteristics. Sketch the Output Characteristics of a Transistor in its Common Base mode and discuss the Active, Cut-off and Saturation Regions. Why CB configuration is rarely used in Audio-Frequency circuits? (8)

Q.3 a. A CE transistor amplifier with h-parameters provided by hie = 1100, hre = 2.5 10-4 , hfe = 50, hoe = 25 A/V. If RL = one K and RS = 1K, then compute (i) AI (ii) RIN (iii) AV (iv) AVS (v) AIS (8)

b. Draw the circuit of Darlington Pair Amplifier and discuss its operation. Also show that its current gain is equal to.Give its applications. (8)

Earning:   Approval pending.