8/13/2019 Me2255 Emp Qb

1/6

ME2255/ ELECTRONICS AND MICROPROCESSORS- IV Sem MECH G.Premavathy Asst.Prof./ECE1

M H L KSHMIENGINEERING COLLEGETIRUCHIRAPALLI621213

QUESTION BANK

DEPARTMENT:MECHANICAL ENGINEERING SEMESTER: IV

SUBJECT CODE / Name: ME 2255 / ELECTRONICS AND MICROPROCESSORS

UNIT I: SEMICONDUCTORS AND RECTIFIERS

PART - A (2 Marks)

1. Define Rectification. (AUC May/Jun 2012)

2. Define voltage regulation. (AUC May/Jun 2012)

3. Define PN junction. (AUC Nov/Dec 2011)

4. What is a rectifier? What are its types? (AUC Nov/Dec 2011)

5. What is diffusion current? (AUC Apr/May 2011)

6. Draw the circuit of Bridge rectifier with input and output waveforms. (AUC Apr/May 2011)

7. Draw the circuit of zener voltage regulator. (AUC Apr/May 2010)

8. A half wave rectifier having a resistance load of 1k rectifies an alternating voltage of 325 V

peak value and the diode has a forward resistance of 100. Calculate its dc power output.

(AUC Apr/May 2010)

PART B (16 Marks)

1. (i) Draw and explain the circuit of a full wave rectifier. (8)

(ii) Discuss about intrinsic and extrinsic semiconductors. (8) (AUC May/Jun 2012)

2. (i) What do you mean by zener effect? Explain the characteristics of zener diode. (6)

(ii) Explain how zener diode is used as a voltage regulator.(10) (AUC May/Jun 2012)

3. Draw V/I characteristics of PN junction diode and explain the function of a full wave rectifier

with a neat circuit diagram. (AUC Nov/Dec 2011)

4. Explain the working principle of zener voltage regulator with relevant diagram.

(AUC Nov/Dec 2011)

5. Design a zener voltage regulator for the output voltage of 5 V and output current of 200 mA.

Support your answer with the zener characteristics and relevant circuit diagram.

(AUC Apr/May 2011)

8/13/2019 Me2255 Emp Qb

2/6

ME2255/ ELECTRONICS AND MICROPROCESSORS- IV Sem MECH G.Premavathy Asst.Prof./ECE2

6. Explain the operation of open circuited PN junction using the energy band structure.

(AUC Apr/May 2011)

7. Draw and explain the formation of a PN junction and explain the working of the diode under

forward and reverse biased conditions. (AUC Apr/May 2010)

8. Is it possible to replace a zener diode with an ordinary rectifier diode? If no, explain the

desired characteristics of zener diode. (AUC Apr/May 2010)

9. (i) Explain about intrinsic and extrinsic semiconductors.

(ii) Draw zener diode characteristic and explain.

UNIT II: TRANSISTORS AND AMPLIFIERS

PART - A (2 Marks)

1. What is the need for transistor biasing? (AUC May/Jun 2012)

2. Draw the transfer characteristics of FET. (AUC May/Jun 2012)3. Compare BJT and FET. (AUC Nov/Dec 2011)

4. Define Avalanche breakdown. (AUC Nov/Dec 2011)

5. Define stability factor of BJTs. (AUC Apr/May 2011)

6. Write the equation governing intrinsic standoff ratio. (AUC Apr/May 2011)

7. What is early effect in BJTs? (AUC Apr/May 2010)

8. Define voltage safety factor of thyristor. (AUC Apr/May 2010)

PART B (16 Marks)

1. (i) Draw and explain the circuit of a Class B Pushpull power amplifier. (10)

(ii) What do you mean by negative feedback? List the characteristics and advantages of a

negative feedback amplifier. (6) (AUC May/Jun 2012)

2. Draw and explain the characteristic of a FET amplifier and discuss its merits and

applications. (AUC May/Jun 2012)

3. Draw the circuit of a FET amplifier and explain its operation. (AUC Nov/Dec 2011)

4. Sketch the input and output characteristics of common emitter configuration and explain how

these are obtained? (AUC Nov/Dec 2011)

5. If the various parameters of a CE amplifier which uses the self bias method are Vcc = 12 V,

R1= 10 k , R2= 5 k , Rc = 1 k , RE = 2 k and = 100, find

(i) the coordinates of the operating point

(ii) the stability factor, assuming the transistor to be silicon. (AUC Apr/May 2011)

8/13/2019 Me2255 Emp Qb

3/6

ME2255/ ELECTRONICS AND MICROPROCESSORS- IV Sem MECH G.Premavathy Asst.Prof./ECE3

6. Why do we prefer negative feedback system? Explain the operation of voltage shunt

feedback with required diagrams. (AUC Apr/May 2011)

7. With neat circuit diagrams, explain the methods of transistor biasing. (AUC Apr/May 2010)

8. Write in detail about the operation of JFET under various biasing conditions.

(AUC Apr/May 2010)

UNIT III: DIGITAL ELECTRONICS

PART - A (2 Marks)

1. What are Flipflops? (AUC May/Jun 2012)

2. Draw a half adder circuit. (AUC May/Jun 2012)

3. What are universal gates? (AUC Nov/Dec 2011)

4. State Demorgans theorem. (AUC Nov/Dec 2011)

5. Simplify the Boolean expression. F = (A + B+ C)(A + B + C) (AUC Apr/May 2011)

6. Draw the circuit of transparent latch. (AUC Apr/May 2011)

7. Using Boolean laws, prove thatXY +Y =X +Y (AUC Apr/May 2010)

8. Convert the following circuit into its equivalent NAND circuit (AUC Apr/May 2010)

PART B (16 Marks)

1. (i) Design a full adder. (10)

(ii) Discuss the operation of RS flip flop and D flip flop. (6) (AUC May/Jun 2012)

2. Draw and explain the operation of A/D and D/A converters. (AUC May/Jun 2012)

3. Design a full adder circuit with the aid of neat diagram and a truth table.

(AUC Nov/Dec 2011)

4. With the help of neat circuit diagram explain the function of a Ripple counter.

(AUC Nov/Dec 2011)

5. With the logic diagram, explain the working of Ring counter.

Also draw the timing diagrams. (AUC Apr/May 2011)

6. Reduce the following function and implement using universal gates. (AUC Apr/May 2011)

F = ABC + ABC + ABC + ABC + ABC + ABC

8/13/2019 Me2255 Emp Qb

4/6

ME2255/ ELECTRONICS AND MICROPROCESSORS- IV Sem MECH G.Premavathy Asst.Prof./ECE4

7. Implement the full adder circuit from its truth table. (AUC Apr/May 2010)

8. Design a four bit binary parallel counter. Support your answer with circuit diagram and truth

table. (AUC Apr/May 2010)

UNIT IV: 8085 MICROPROCESSOR

PART - A (2 Marks)

1. List the various instruction types in 8085. (AUC May/Jun 2012)

2. What are the various addressing modes in 8085? (AUC May/Jun 2012)

3. What do you mean by ALU? (AUC Nov/Dec 2011)

4. What are the types of addressing modes? (AUC Nov/Dec 2011)

5. Name the address partitioning technique used in 8085. (AUC Apr/May 2011)

6. What is the output at port 1 when the following instructions are executed?

(AUC Apr/May 2011)

MVI A,8FH

ADI 72H

JC LOOP

OUT PORT 1

HLT

LOOP: XRA A

OUT PORT 1

HLT

7. Specify the output at port 1 if the following ALP is executed. (AUC Apr/May 2010)

MVI B,88H

MOV A,B

MOV C,A

MVI D,73H

OUT PORT 1

HLT

8. List the interrupts and their call locations. (AUC Apr/May 2010)

8/13/2019 Me2255 Emp Qb

5/6

ME2255/ ELECTRONICS AND MICROPROCESSORS- IV Sem MECH G.Premavathy Asst.Prof./ECE5

PART B (16 Marks)

1. Sketch the architecture of 8085 and explain the modules in detail. (AUC May/Jun 2012)

2. With examples, explain the data transfer instructions and arithmetic instructions of 8085.

(AUC May/Jun 2012)

3. With a neat sketch explain the architecture of the microprocessor 8085.

(AUC Nov/Dec 2011)

4. Explain the classification of instruction set of the microprocessor 8085. (AUC Nov/Dec 2011)

5. The following block of data is stored in the memory locations from 4000H to 4005H. Transfer

the data to the locations 5000H to 5005H in the reverse order. Write an ALP in 8085 to

perform the block transfer. 22H, A5H, B2H, 99H, 7FH, 37H (AUC Apr/May 2011)

6. Explain the interrupt structure of 8085 CPU with the required diagrams.(AUC Apr/May 2011)

7. What are the addressing modes supported in 8085 CPU? Explain each of them with

minimum of 2 sample instructions. (AUC Apr/May 2010)

8. Explain the architecture of 8085 with the required diagrams. Also write the salient features of

the same. (AUC Apr/May 2010)

UNIT V: INTERFACING AND APPLICATIONS OF MICROPROCESSOR

PART - A (2 Marks)

1. What do you mean by interfacing? (AUC May/Jun 2012)

2. List out some applications of the microprocessors. (AUC May/Jun 2012)

3. Name any two applications of microprocessor. (AUC Nov/Dec 2011)

4. Define the term step angle with reference to a stepper motor. (AUC Nov/Dec 2011)

5. What is the role of tri state buffer in interfacing of peripherals with CPU?(AUC Apr/May 2011)

6. Write the use of ALE signal in 8085. (AUC Apr/May 2011)

7. Define interfacing devices. (AUC Apr/May 2010)

8. What is transceiver? (AUC Apr/May 2010)

PART B (16 Marks)

1. Draw and explain the block diagram and operation of temperature controlling system with a

microprocessor. (AUC May/Jun 2012)2. Draw and explain the block diagram and operation of Traffic light controller with a

microprocessor. (AUC May/Jun 2012)

3. Write short notes on keyboard interfacing. (AUC Nov/Dec 2011)

8/13/2019 Me2255 Emp Qb

6/6

ME2255/ ELECTRONICS AND MICROPROCESSORS- IV Sem MECH G.Premavathy Asst.Prof./ECE6

4. Explain the operation of microprocessor based traffic light controller. (AUC Nov/Dec 2011)

5. Design an 8085 CPU based traffic monitoring and control system to control the traffic at 4

corner junction. (AUC Apr/May 2011)

6. Suggest the methods to vary the speed of shaft of a machine using stepper motor. Design

the microprocessor based system interface to control the speed of stepper motor.

(AUC Apr/May 2011)

7. How to control the speed of a stepper motor with 8085 CPU and its interface? Draw a neat

interface diagram and explain its operation. (AUC Apr/May 2010)

8. Design a traffic light control system using 8085 CPU. Write its sequence of operation with

neat block diagram of the system. Support your answer with the software flowchart.

(AUC Apr/May 2010)

N

S

W

Traffic System