Download PTU B.Tech 2020 March Automation-And-Robotics Question Paper 3rd Sem BTAR 302 Electronics Devices And Digital Circuits

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Roll No. ‘ ‘ ‘ ‘ ‘ ‘ | ‘ ‘ ‘ ‘ Total No. of Pages : 02
Total No. of Questions : 09
B.Tech.(Automation & Robotics) (2012 & Onwards) (Sem.-3)
ELECTRONICS DEVICES AND DIGITAL CIRCUITS
Subject Code : BTAR-302

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INSTRUCTION TO CANDIDATES :

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.

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2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.

SECTION-A

1. Answer briefly :
   1. Draw a hybrid model for a linear circuit having V_i, I_i is input voltage, current and V_o, I_o is output voltage, current.
   2. Draw the circuit indicating the use of 78XX as an adjustable voltage regulator. Also write the expression for output voltage.

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   3. An op-amp has an open-loop gain of 90,000. Vs = +13V. A differential voltage of 0.1Vpp is applied between the inputs. What is the output voltage?
   4. What is a key characteristic of an instrumentation amplifier?
   5. Define Monostable Multivibrator. Why it is called one-shot multivibrator?
   6. What is K-map?
   7. What is the advantage of D-flip-flop over an S-R flip-flop?

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   8. Differentiate between Demultiplexer and Decoder.
   9. What is the maximum modulus for a counter with 4 numbers of flip-flops?
   10. Draw the circuit diagram of mono-stable multivibrator using NPN transistors.

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SECTION-B

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1. Draw the equivalent circuit of a common emitter amplifier in terms of h- and obtain the expression for voltage gain. (2.5+2.5)
2. Define and explain filter voltage Regulation and ripple voltage. (2.5+2.5)
3. Draw the schematic diagram of a peak detector using an operational amplifier and explain its working. (2+3)
4. Draw the block diagram of VCO. Explain its working in details. Also write down the expression for centre-operating frequency f. (1 +2+2)
5. Draw and explain the working of Master-Slave JK flip-flop. (1.5+3.5)

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SECTION-C

1. What is a Schmitt trigger? Draw the schematic diagram of Schmitt trigger explain its working in details. How does it differ from a comparator? (2+6+2)
2. Draw and explain the working of a 555 timer connected as a mono-stable multivibrator. Derive the relation for the time interval during which the output remains high. (7+3)
3. Draw and explain the working of a circulating register or ring counter. (3+7)

NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.

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