Frequently Asked Questions GE6252 BEEE UNIT I ELECTRICAL CIRCUITS AND MEASUREMENTS

Size: px

Start display at page:

Download "Frequently Asked Questions GE6252 BEEE UNIT I ELECTRICAL CIRCUITS AND MEASUREMENTS"

Merryl Blake
5 years ago
Views:

Frequently Asked Questions GE6252 BEEE UNIT I ELECTRICAL CIRCUITS AND MEASUREMENTS 1. What is charge? 2. Define current. 3. Under what condition AC circuit said to be resonant? 4.

1 Frequently Asked Questions GE6252 BEEE UNIT I ELECTRICAL CIRCUITS AND MEASUREMENTS 1. What is charge? 2. Define current. 3. Under what condition AC circuit said to be resonant? 4. What do you meant by balanced load in a three phase circuit. (AU-May/June 2014) 5. Define power. (AU-May/June 2006, AU-May/June 2007) 6. Define resistance. 7. A 120 ohm resistor has a specified maximum power dissipation of 1 W. Find the maximum current level. (AU-May/June 2013) Define international ohm. 8.What are the factors affecting resistance? 9. Mention the errors in Moving Iron instruments? (AU-May/June 2015) 10. A 50 ohm resister is in parallel with a 100 ohm resistor. The current is 50 ohm resistor is 7.2 A. What is the value of third resistor to be added in parallel to make the total line current of 12.1 A (AU-May/June 2016) 11. State Kirchhoff s laws. (Dec 2004, AU-May/June 2006, AU-May/June 2014) (AU-May/June 2015) 12. What is series circuit? 13. What is parallel circuit? 14. State Ohm s law and its limitations. (AU-May/June 2014) 15. Define form factor. 16. Define the principle of Moving Iron instrument for attraction type. (AU-May/June 2014) 17. Define apparent power. (AU-May/June 2005) 18. Define RMS Value of an alternating quantity. (AU-May/June 2015) 19. Define capacitance. 20. Name the essential torques required for the proper operation of indicating instrument. (AU-May/June 2015) 21. List the operating forces present in indicating instruments. (AU-May/June 2016) 22. Write down the expression for effective resistance when three resistances are connected in series and parallel PART B 1. Problems in Kirchoff s laws. (AU-May/June 2015, AU-May/June 2013, AU-May/June 2014, AU- May/June 2014)

2 2013) (AU-May/June 3. (AU-May/June 2014 ) 4. (AU-May/June 2014) 5. State and explain kirchoff s laws. (AU-May/June 2013)

3 6. A Series circuit has R= 10 ohms, L=50mH, C= 100 Micro Farad, and is supplied with 200V, 50Hz. Find (i) Impedance, (ii) Current, (iii) Power, (iv) Power factor, (v) Voltage drop across each element. (AU-May/June 2014) (AU-May/June 2016) 7. Derive and expression for phase angle in the R-L series circuit, R-C series circuit and R-L-C Series circuit. (AU-May/June 2016). 8. Two impedances (8+j10) ohm and (7+j9)ohm are connected in parallel. Find magnitude and phase angle of total impedance. Another impedance (5-j2) ohm is connected in series with above combination. Find overall impedance. (AU-May/June 2016) 9. RL series circuits having a resistance of 6 ohms and an inductance of 0.03H is connected across a 100V, 50Hz supply. Calculate the phase angle between the current and voltage, Power factor (AU- May/June 2014) 10. With the neat diagrams, explain the construction and working principle of permanent magnet moving coil instruments. Obtain an expression for its deflecting torque. (AU-May/June 2015) (AU-May/June 2014) 11. Write short notes on moving iron instruments under the following headings. 1. Operating principle, 2. Classification, 3. Advantages and Disadvantages (AU-May/June 2013) (AU- May/June 2015) (AU-Nov/Dec 2014) 12. Explain the working principle of dynamometer type of wattmeter. Mention its disadvantages also. (AU-May/June 2015) (AU-May/June 2014) (AU-Nov/Dec 2014) 13. Explain the construction and principle of operation of single phase Energy Meter (AU-May/June 2016) (AU-Nov/Dec 2014)

4 Frequently Asked Questions GE6252 BEEE UNIT II ELECTRICAL MACHINES 1. What is the significance of Back EMF? (AU-May/June 2015) 2. What is an electric motor? 3. Why a single phase induction motor does not self start?. (AU-May/June 2015) 4. State faraday s law of electromagnetic induction. 5.Sketch OCC of DC generator? (AU-May/June 2016) 6. What is the function yoke? 7. List the types of single phase induction motor. (AU-May/June 2014) 8. Give the emf equation of dc generator. 9. What are all the two types of excitation? 10. What is meant by residual magnetism? 11. State that the Fleming s left hand rule. 12.A DC shunt generator supplies a load of 10 kw at 220V through feeders of resistance of 0.1 ohms. The resistance of armature and shunt field windings are 0.05 ohms and 100 ohms respectively. Find the terminal voltage. (AU-May/June 2013) 13. List the different types of DC motor. 14. In a single phase transformer, Np=350 turns, Ns=1050 turns, Ep = 400V. Find Es =? (AU-May/June 2013) 15. List out the characteristics of DC motor. 16. What are all the applications of DC motor? (AU-May/June 2015) 17. What is the necessity of starter? (AU-May/June 2014) 18. Write down the EMF equation of a transformer? (AU-May/June 2016) 19. Define voltage regulation of a transformer. (AU-May/June 2014) 20. List out the applications of various types of generators. 21. What is Lenz s law? PART - B 1. Write the Construction, Principle of Operation of DC generator. (AU-May/June 2015) (AU- Nov/Dec 2014) 2. Write short notes on DC machines (AU-May/June 2013) 3. A 220v, DC series motor runs at 700 rpm when operating at its full load current of 20A. The motor resistance is 0.5 ohms and the magnetic circuit may be assumed unsaturated. What will be speed if (I) Load torque is increased by 44%, (ii) Motor current is 10A, (iii) Explain the operating principle of a DC motor. (AU-May/June 2015) (* Problems in DC Motor voltage Equations) 4. A 4 pole, wave wound generator having 40 slots and 10 conductors placed per slot. The flux per pole is 0.02 wb. Calculate the Generated EMF when the generator is driven at 1200 rpm. (AU- May/June 2014) 5. A 25kW, 250V, DC shunt generator has armature and field resistance of 0.06 ohm and 100 ohm respectively. Determine the total armature power developed when working

5 (i) As a generator delivering 25 kw output and (ii) as a motor taking 25 kw (AU-May/June 2014) 6. Explain the Principle and Working of DC motor and derive torque and speed equation. (AU- May/June 2014) (AU-May/June 2015) 7. The armature of a DC machine has resistance of 10 ohms and is connected to a 230V Supply. Calculate the Back EMF when it is running (i) As a generator giving 100A, (ii) As a motor taking 100A. (AU-Nov/Dec 2014) 8. Describe various types of self excited DC generators with their circuit layout.(au-may/june 2016) 9. Explain the characteristics of DC shunt motor.(au-may/june 2016) 10. A three phase, 200 kw, 50 Hz delta connected induction motor is supplied from a three phase, 440V, 50 Hz supply system. The efficiency and power factor of three phase induction motor are 91%, 0.86 respectively. Calculate Current in each phase and Line current., Phaser diagram of the circuit. (AU-May/June 2013) 11. Explain the basic nature of the EMF induced in the armature of a DC machine. (AU-May/June 2013) 12. What are the characteristics of an ideal transformer? (AU-May/June 2013) 13. Explain the Constructional details of a single phase Transformer. (AU-May/June 2015) (AU- May/June 2014)(AU-May/June 2016) 14. Derive the EMF equation of a Transformer. 15. Explain the Principle of working Single phase induction motor. (AU-May/June 2014) 16. Explain the details about Split phase, Capacitor start induction motors

6 Frequently Asked Questions GE6252 BEEE UNIT III SEMICONDUCTOR DEVICES AND APPLICATIONS 1. Compare PN diode and Zener diode. (AU-May/June 2015) 2.What is effect of saturation of a transistor? (AU-May/June 2015) 3.Write the current amplification factor for a CE transistor. 4. Define the two breakdown conditions of zener diode. (AU-May/June 2014) 5. Define rise time 6. Define turn-on time 7. Find the values of Ic, Ib and. Transistor values are =0.95, Ie = 1 ma. (AU-May/June 2014) 8. Define turn-off time 9. Define hybrid parameters of transistor. (AU-May/June 2016) 10. What are the use of h - Parameters? 11. What is doping? (AU-May/June 2014) 12. What are the advantages of transistors? 13. What are the types of transistors? 14. What is mean by characteristics of transistor? 15. Draw the circuit diagram of half wave rectifier? (AU-May/June 2016) 16. Write the current amplification factor for a CB transistor 17. Give the another names for depletion region. (AU-May/June 2014) 18. Draw the characteristics of Zener diode. (AU-May/June 2015) PART - B 1. Explain the details about the Construction, Working and VI characteristics of PN junction diode and Zener diode. (AU-May/June 2014, AU-May/June 2015, AU-May/June 2016) 2. Explain the operation of Full wave rectifier. (AU-May/June 2015, AU-May/June 2016) 3. What is the effect on capacitance of a PN junction diode as forward and reverse bias are applied? (AU- May/June 2013) 4. In a CE, Ib changes from 100µA to 150µA which causes a change in Ic from 5 ma to 7.5 ma. If Vce is held constant at 10V, find ac. (AU-May/June 2013) 5. Explain the working principle of Half wave Full wave rectifier with neat waveform. (AU-May/June 2016) 6. Explain the operation of NPN and PNP transistor. (AU-May/June 2014) 7. Derive an expression for RMS value, current, DC power, efficiency, PIV and TUF. (AU-May/June 2015, AU-May/June 2013) 8. Explain the elementary treatment of small signal amplifier. (AU-May/June 2015) 9. Sketch a common emitter amplifier circuit with an NPN transistor. (AU-May/June 2013) 10. Explain in detail about Common Base, Common Emitter and Common Collector Configuration (AU- May/June 2014) (AU-May/June 2015, AU-May/June 2016) 11. Give details about Small Signal Common Emitter amplifier and Collector Follower amplifier

7 Frequently Asked Questions GE6252 BEEE UNIT IV DIGITAL ELECTRONICS 1. Define binary logic? 2. Convert Hexa to Decimal. (AU-May/June Convert (9B2-1A) H to its decimal equivalent. 4. State the different classification of binary codes? 5. Which gates are called as the universal gates? What are its advantages? (AU-May/June 2015). 6. Convert decimal number to its hex equivalent 7.Find the binary difference (AU-May/June 2103) 8. Subtract from using 2 s complement method 9. State the abbreviations of ASCII and EBCDIC code? (DEC 2005) 10. Write the names of basic logical operators. 11. Reduce AB + (AC)' + AB'C(AB + C) 12. State De-morgan s theorem.(au-may/june 2016) 13. What is flip flop? (AU-May/June 2015) (AU-May/June 2014) 14. What are the types of flip flops. (AU-May/June 2014) 15. What are the types of Analog to digital converter. (AU-May/June 2014) 16. Define the logic operation of AAU-Nov/Dec gate with Boolean equation. (AU-May/June 2014) 17. What are the types of A/D Converters. 18.Convert the given expression in canonical SOP form Y = AC + AB + BC Y = AC + AB + BC 19. What is register in digital systems.?(au-may/june 2016) 20. Define the logic operation of AAU-Nov/Dec gate with Boolean equations. (AU-May/June 2014) PART B 1. Draw the logic symbol of ALL gates and explain its logic operation. (AU-May/June 2014, AU- May/June 2016) 2. Explain the operation and truth table of half adder with a neat diagram. (AU-May/June 2015, AU- May/June 2014) 3. Design a full adder, construct the truth table, simplify the output equations and draw the logic diagram. (AU-May/June 2013, AU-May/June 2016) 4. Give details about all flip flops. (AU-May/June 2015) (AU-May/June 2014) 5. Write details about Asynchronous Up and Down, Synchronous Up and Down Counters. (AU- May/June 2014, AU-May/June 2015) 6. Explain the working principle of D/A and A/D converters (AU-May/June 2016) 7. Give the brief explanation of an A/D conversion and need for the A/D Conversions. (AU-May/June 2013) 8. Describe the categorization and functioning of shift registers. (AU-May/June 2015) 9. Explain the Successive Approximation method in A/D converters. (AU-May/June 2013, AU- May/June 2014) 10. Explain in detail about D- Flip flop, T-Flip flop, JK Flip flop (AU-May/June 2016)

8 11. Realize the logic operation Y = (A+B)(A +C)(B+D) using basic gates. (AU-May/June 2016) 12. Realize and draw the logic diagram for the given function with minimum number of gates A B+ABC+AB (B+C)+ABC 13. Explain the types of D/A converters (AU-May/June 2014) 14. Reduce the following expressions using Boolean algebra postulates: (AU-May/June 2015) a b c +ab c +abc [(A+B) + C ] 15. Realize the given expression using only NAND gates and inverters : xyz + x y z (AU-May/June 2015)

9 Frequently Asked Questions GE6252 BEEE Unit V Communication Engineering 1. What is communication? 2. What are the types of signals? 3. Give few examples of Analog signals? 4. Define modulation? (AU-Nov/Dec 2013) 5. Define Modulation Index. (AU-Nov/Dec 2014) 6.Why are AM systems preferred in broadcasting over FM systems? (AU-May/June 2014) 7. Based on the modulation index classify AM modulator 8.List the various types of microwave antennas. (AU-May/June 2014) 9. Differentiate analog and digital signals. (AU-May/June 2015, AU-May/June 2014, AU-Nov/Dec 2012) 10. Define modulation lined in case of FH. 11. What is Radio communication? 12. Write the working principle of Q meter. (AU-Nov/Dec 2014). 13. Define total internal reflection. (AU-May/June 2015) 14.Why are digital signals said to be noise immune? (AU-May/June 2013) 15.What is microwave? 16.List few advantages of Optical fiber communication. (AU-May/June 2014) 17.List few applications of microwaves communication. (AU-May/June 2015) 18. Write down the formula for time taken by the satellite for encircling the earth. 19.Based on coverage classify the orbits. 20. Draw the block diagram of microwave communication (AU-May/June 2015, AU-May/June 2016) 21. State the functions of a satellite transponder. (AU-Nov/Dec 2012) PART B 1. Why modulation is necessary? Write in detail about frequency modulation. (AU-May/June 2015, AU-May/June 2015, AU-May/June 2016, AU-Nov/Dec 2012) 2. With neat diagram explain any one method of amplitude modulation and its corresponding demodulation. (AU-May/June 2013) 3. What is meant by amplitude modulation? Explain also the connected terms Modulation Index, AM Wave equation and Spectrum. (AU-Nov/Dec 2012) 4. Explain in detail about Amplitude Modulation and Frequency Modulation. (AU-May/June 2016) (AU-May/June 2014, AU-Nov/Dec 2013) 5. Describe the principle of modulation and its needs. Short note on amplitude modulation and frequency modulation (AU-May/June 2014) *(Q.No. 1,2,3,4,5,6 have answer from same topic)* 6. Give some advantages of FM over AM. (AU-May/June 2014) 7. Draw and explain the functional block diagram of Monochrome TV transmitter and receiver. (AU- May/June 2014, AU-May/June 2015) 8. Draw the block diagram of B/W TV receiver and explain it. (AU-May/June 2016) 9. Write in details about Facsimile communication system.

10 10. Discuss the usage of satellite for long distance communication with a neat block diagram of basic satellite transponder. (AU-May/June 2015, AU-May/June 2014, AU-Nov/Dec 2013) 11. Explain the configuration of Satellite communication with neat diagram. Give its merits and Demerits. (AU-May/June 2016) 12. Write short notes on Microwave and Optical fiber. (AU-May/June 2013) 13. Draw the block diagram of optical fiber communication system and explain it. (AU-May/June 2016)

Reg. No. : Question Paper Code : B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER Second Semester.

WS 20 Reg. No. : Question Paper Code : 27273 B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2015. Second Semester Civil Engineering GE 6252 BASIC ELECTRICAL AND ELECTRONICS ENGINEERING (Common to all