Placement Hand Book

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This Book is useful for final year Electronics Engineering.

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ECE

PLACEMENT HAND-BOOK 2012 2013

Complied by Mr.U.Ragavendran

ACKNOWLEDGEMENT

This is our privilege and pleasant task to express our sincere gratitude to our respected Director Dr.C.Muthamizhchelvan, Faculty of Engineering and Technology from whom we had received support and guidance in the process of this book. We record our sincere thanks to Dr. S. Malarvizhi, Head of the Department, Dept. of Electronics and Communication, SRM University, for providing us the necessary departmental facilities to publish this book. We also extend our gratitude to Dr.R.Kumar, Professor, Dept. of Electronics and Communication, SRM University for his useful instructions and guidance to complete this book. We deliver our heartfelt gratitude to Mr. P.Vijayakumar Assistant Professor (Sr.G), Dept. of Electronics and Communication, SRM University and Placement Team Members for the encouragement and support they gave in preparation of this book. We sincerely thank all the Teaching and Non- Teaching Staffs for their support.

Authors

INDEX

CHAPTER NUMBER

TITLE

PAGE NUMBER

1

BASIC ELECTRONICSMr.R.Ramesh

1

2

MICROPROCESSOR & MICRO CONTROLLERMrs.R.Vinolee

15

3

DIGITAL ELECTRONICSMrs.K.Suganthi

52

4

DATA COMMUNICATION & COMPUTER NETWORKMrs.V.Nithya & Mr. M. Aravindan

77

5

HARDWARE DESCRIPTION LANGUAGEMrs. K. Ferents Koni Jiavana

94

6

COMPUTER ARCHITECTUREMrs. A. Vinnarasi

159

DEPARTMENT OF ECE

CHAPTER 1 BASIC ELECTRONICSPLACEMENT HAND-BOOK 2012 2013 Page 1

DEPARTMENT OF ECE

1. What is the color code for a 220 5 % resistor? A.Red, Red, Brown, Gold B.Orange, Orange, Black, Gold C.Red, Red, Black, Gold D.Red, Red, Brown, Silver 2. If 60 J of energy are available for every 15 C of charge, what is the voltage? A.4 V B.60 V C.15 V D.0.25 V 3. An atom's atomic number is determined by the number of: A.neutrons minus protons B.protons C.electrons D.neutrons 4. Which resistive component is designed to be temperature sensitive? A.Thermistor B.Rheostat C.Potentiometer D.Photoconductive cell 5. In practical applications, battery voltage: A. is restored as soon as disconnect occurs B. is lowered as the load increases C. may be stored indefinitely D. will be reduced to zero as power is drawn 6. A voltmeter is used: A. to measure current B. in series with the circuit C. in parallel with the circuit D. to measure coulombs 7. If the current in a circuit equals 0 A, it is likely that the A. voltage is too high B. resistance is too low C. circuit has a short D. circuit is open 8. Which voltage source converts chemical energy to electrical energy? A. Electrical generator B. Battery C. Solar cell D. Electronic power supply

PLACEMENT HAND-BOOK 2012 2013

Page 2

DEPARTMENT OF ECE

9. In which states may matter may be found? A. solid, liquid, or mineral B. solid, gas, or liquid C. mineral, gas, or liquid D. plastic, solid, or gas 10. How many valence shell electrons are there in semiconductor atoms? A. 16 B. 8 C. 4 D. 2 11. When considering conventional current versus electron current flow: A. electron current flow came first B. protons move in conventional current flow C. conventional current flow came first D. the direction of current is the same in both methods 12. The center frequency of a band-pass filter is always equal to the A. bandwidth B. 3 dB frequency C. bandwidth divided by Q D. geometric average of the critical frequencies 13. A zero-level detector is a A. comparator with a sine-wave output B. comparator with a trip point referenced to zero C. peak detector D. limiter 14. A digital-to-analog converter is an application of the A. scaling adder B. voltage-to-current converter C. noninverting amplifier D.adjustable bandwidth circuit 15. If the input to a comparator is a sine wave, the output is a A. ramp voltage B. sine wave C. rectangular wave D. sawtooth wave 16. A basic series regulator has A. an error detector B. a load C. a reference voltage D. both an error detector and a reference voltage 17. A comparator is an example of a(n) A. active filter B. current sourcePLACEMENT HAND-BOOK 2012 2013 Page 3

DEPARTMENT OF ECEC. linear circuit D. nonlinear circuit 18. An ideal operational amplifier has A. infinite output impedance B. zero input impedance C. infinite bandwidth D. All of the above 19. Another name for a unity gain amplifier is: A. difference amplifier B. comparator C. single ended D. voltage follower 20. If ground is applied to the (+) terminal of an inverting op-amp, the () terminal will: A. not need an input resistor B. be virtual ground C. have high reverse current D. not invert the signal 21. An astable multivibrator is also known as a: A. one-shot multivibrator B. free-running multivibrator C. bistable multivibrator D. monostable multivibrator 22. With negative feedback, the returning signal: A. aids the input signal B. is proportional to output current C. opposes the input signal D. is proportional to differential voltage gain 23. A circuit whose output is proportional to the difference between the input signals is considered to be which type of amplifier? A. common-modeB. darlington C. differentialD. operational 24. The voltage follower has a: A. closed-loop voltage gain of unity B. small open-loop voltage gain C. closed-loop bandwidth of zero D. large closed-loop output impedance 25. The ratio between differential gain and common-mode gain is called: A. amplitude B. differential-mode rejection C. common-mode rejection D. phase 26. If the input to a comparator is a sine wave, the output is a: A. ramp voltage B. sine wavePLACEMENT HAND-BOOK 2012 2013 Page 4

DEPARTMENT OF ECEC. rectangular wave D. sawtooth wave 27. An instrumentation amplifier has a high A. output impedance B. power gain C. CMRR D. supply voltage 28. Circuits that shift the dc level of a signal are called A. limiters B. clampers C. peak detectors D. dc converters 29. The major difference between ground and virtual ground is that virtual ground is only a: A. voltage reference B. current reference C. power reference D. difference reference 30. The Schmitt trigger is a two-state device that is used for: A. pulse shaping B. peak detection C. input noise rejection D. filtering 31. When a capacitor is used in place of a resistor in an op-amp network, its placement determines: A. open- or closed-loop gain B. integration or differentiation C. saturation or cutoff D. addition or subtraction 32. The common-mode voltage gain is A. smaller than differential voltage gain B. equal to voltage gain C. greater than differential voltage gain D. None of the above 33. An output that is proportional to the addition of two or more inputs is from which type of amplifier? A. differentiator B. difference C. summing D. analog subtractor 34. An ideal amplifier should have: A. high input current B. zero offset C. high output impedance D. moderate gainPLACEMENT HAND-BOOK 2012 2013 Page 5

DEPARTMENT OF ECE35. What is the difference between common-mode and differential-mode input signals? A. phase relationship B. voltage C. current D. apparent power 36. What is a varistor? A. a voltage-dependent resistor B. a voltage-dependent diode C. a current-dependent resistor D. a current-dependent diode 37. Which type of transformer is required to create a 180 degree input to a rectifier? A. center-tapped secondary B. step-down secondary C. stepped-up secondary D. split winding primary 38. Since diodes are destroyed by excessive current, circuits must have: A. higher voltage sources B. current limiting resistors C. more dopants D. higher current sources 39. A diode for which you can change the reverse bias, and thus vary the capacitance is called a A. varactor diode B. tunnel diode C. zener diode D. switching diode 40. When a diode is forward biased, the voltage across it A. is directly proportional to the current B. is inversely proportional to the current C. is directly proportional to the source voltage D. remains approximately the same 41. Why is heat produced in a diode? A. due to current passing through the diode B. due to voltage across the diode C. due to the power rating of the diode D. due to the PN junction of the diode 42. The arrow in the schematic symbol of a diode points to A. the n-type material, which is called the anode B. the n-type material, which is called the cathode C. the p-type material, which is called the anode D. the p-type material, which is called the cathode 43. The diode schematic arrow points to the: A. trivalent-doped material B. positive axial leadPLACEMENT HAND-BOOK 2012 2013 Page 6

DEPARTMENT OF ECEC. anode lead D. cathode lead 44. Rectifier output polarity depends upon: A. cycles of input B. capacitor polarity C. half or full wave D. diode installation 45. The conduction band is closest to the valence band in A. semiconductors B. conductors C. insulators D. The distance is the same for all of the above. 46. Which of the following circuits would require the least amount of filtering? A. A half-wave rectifier B. A full-wave rectifier C. A bridge rectifier D. A full-wave rectifier and a bridge rectifier 47. The voltage where current may start to flow in a reverse-biased pn junction is called the A. breakdown voltage B. barrier potential C. forward voltage D. biasing voltage 48. The area at the junction of p-type and n-type materials that has lost its majority carriers is called the A. barrier potential B. depletion region C. n region D. p region 49. At any given time in an intrinsic piece of semiconductor material at room temperature A. electrons drift randomly B. recombination occurs C. holes are created D. All of the above 50. List three diode packages: A. clip package, DIP, small current package B. DIP, small current package, large current package C.