mech beem ge2151-qb

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Rajalakshmi Institute of TechnologyGE2151 Basic Electrical and Electronic Engineering

Question Bank

1. Define electric current2. Define electric resistance3. Define electric conductance4. Define specific resistance5. Differentiate electric power and energy6. Define electromotive force7. State ohms law8. State kirchoffs law9. What is an alternating quantity?10.Define cycle11.Define time period12.Define frequency13.Define amplitude14.Define RMS value15.Define average value16.Define the expression for form factor and peak factor17.

Define power factor

18.What do you understand by balanced system?19.What is an indicating instrument?20.Write two essential requirements of indicating instruments21.List the three different torques employed in the measuring instruments for the satisfactory

operation

22.Write any four methods by which the deflecting torque can be obtained23.Mention the two methods of obtaining controlling torque24.What is meant by damping torque?25.Write any two features of moving coil instrument26.Write any two features of moving iron instrument27.What is meant by creeping?28.Convert (100001110.010)2 to decimal.

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29.Give that (79)10 = (142)b determine the value of b.30.Perform the arithmetic operations 35+40 and (-3.5)+(-40) with binary number in signed

2s complement representation.

31. Convert (342.45)10 to binary and Octal.32. Perform the following arithmetic operation using 1s complement scheme. (4-8) ,(8-4) ,(-

2-3)

33. Convert the following: (369)10 =( )8 =( )16 =( )2.34.How many bits are required to represent the decimal numbers in the ranges from 0 to 999

using straight binary code? Using BCD codes?

35.Explain how addition and subtraction can be performed with 1s complement and 2scomplement representations with suitable examples.

36.State de-Morgans Law.37.Why NAND gate is called as an universal gates?38.Write the dual of AB+C+BC39.Realize XOR function using only NAND gates.40.How do you implement y=A+B using a 3 input OR gate?41.Define distributive law.42.What is mean by duality in Boolean Algebra?43.Simplify the following function using algebraic method.

a) F=C(B+C)(A+B+C)44.Implement AND and OR using NAND and NOR gates.45.Give the truth table for JK flip-flop?46.Name the problem associated with the asynchronous counter.47.What is an universal shift register?48.Draw MOD-8 Ripple counter using JK flip-flop and give the timing diagram49.Give the excitation table for JK flip-lop.50.Draw a MOD-6 counter using feedback counter.51.Draw the timing diagram for a 3 stage ring counter.52.How do you construct D flip-flop and T Flip-lop using JK flip-flop.53.Distinguish between Synchronous and asynchronous counter.54.Draw the circuit of serial n and serial out shift register and explain its operation.


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55.Name the two problems that may arise in the ripple counter.56.Draw the circuit of up-down counter and explain its working.57.What is mean by the term edge triggered?58.Describe the operation of BCD counter.59.Draw the logic for 4-stage ring counter using JK flip-flo0p?60.Define the hold time requirement of a clocked FF?61.Show the T flip-flop implementation from S-R flip-flop?62.Give the logical expression for sum and carry for a Half adder.63.Obtain the expression for SUM and CARRY outputs of a full adder and implement the

same.

64.Draw the block diagram of a communication system and explain its operation.65.Explain briefly some of the telecommunication services.66.Distinguish between telegraphy and telephony.67.What is facsimile? how does it work?68.What are the different transmission paths for communication?69.What is the difference between analog and digital signals?70.What is modulation?71.Explain briefly the need for modulation.72.What are the types of analog modulation ?73.Write down a general expression for AM wave.74.Write the expression for modulation index in AM .75.Write down the mathematical expression for a FM wave.76.What is advantage of a FM over AM?77.Compare FM and PM.78.State sampling theorem.79.Define the following terms:

a) Pulse Width Modulation(PWM)b) Pulse Amplitude Modulation(PAM)c) Pulse Time Modulation (PTM)d) Pulse Code Modulation (PCM)

80.Compare PAM and PWM.pdfMachine - is a pdf writer that produces quality PDF files with ease!

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81.Describe briefly some digital modulation schemes.82.Define and describe pulse position modulation.83.What is pulse width modulation ?What other names does it have?84.What is meant by Frequency-Shift Keying?85.Differentiate FSK from PSK86.What is back emf?87.Why a dc series motor cannot be started on no load?88.What are the various types of dc motors?89.What is the necessity of a starter for a dc motor?90.What is torque?91.What is speed regulation?92.What is called armature torque?93.What is called shaft torque?94.Draw the characteristics curve of a dc shunt motor?95.What is the difference between three point and four point starters?96.What is the method available for testing dc series motor?97.Name the protective devices used in a 3point starter?98.Mention the methods of speed control for a dc motor?99.What are the losses that occur in a dc motor?100. What are the various types of dc generators?101. Draw the internal and external characteristic curves of dc shunt generator?102. Draw the internal and external characteristic curves of dc series generator?103. Draw the characteristics curves of dc compound generator?104. DC series generators are suitable for _____________________105. What is the function of commutator in DC generator?106. What is the function of carbon brushes in DC generator?107. What is called voltage regulation?108. Write short notes on efficiency of a DC motor?109. How the voltage builds up in Dc generator?110. Why the armature core is made by laminated sheets?111. Explain the construction and working principle of D.C. generator with neat


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diagram. (16)

112. Explain the different types of D.C. generators. (16)113. Draw and explain the characteristics of different types of d.c.generators. (16)

a). Derive the emf equation of D.C. Generator. (8)

114. Sketch and explain the speed-current, speed-torque and torque-currentcharacteristics of a shunt motor, series motor and compound motor. (16)

115. Draw the characteristic curves of D.C. shunt, series and compound motors. Usethese curves to explain the applications for which these motors are used. (16)

116. a) List all the important parts of a D.C. Motor and explain the importance ofeach..a)Calculate the emf generated by 4 pole wave wound generator having 65

slots with 12 conductors per slot when driven at 1200 rpm. The flux per pole is

0.02 wb. (8)

117. A 4 pole lap wound dc shunt generator has a useful flux per pole of 0.07wb.The armature winding consists of 220 turns, each of 0.004 ohm resistance.

Calculate the terminal voltage when running at 900 rpm if the armature

current is 50A. (16)

118. Explain the principle of working a 1f transformer?119. Discuss the difference between core type and shell type construction?120. What is KVA rating of a transformer?121. Draw the no load phasor diagram of a transformer?122. Draw the phasor diagram of a transformer under load condition?123. Explain voltage regulation?124. Derive the emf equation of a transformer?125. What is meant transformation ratio?126. How the transformers are classified?127. Write short notes on autotransformer.128. Derive the condition for maximum efficiency?129. What are the various losses that must be present in a transformer?130. Explain the construction and working principle of single-phase transformer.(16)131. Enumerate the various types of transformer. (4)132. Derive an expression for the emf of an ideal transformer winding. (6)


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133. Draw and explain the no load phasor diagram for a single-phase transformer. (6)134. What is KVA rating of a transformer? (8)135. Explain various features of an ideal transformer. (8)136. b)The no load current of a transformer is 10A at a power factor of 0.25 lagging,

when connected to 400v,50Hz supply, calculate(i)magnetizing component of no load

current (ii) iron loss and(iii) maximum value of the flux in the core. Assume

primary winding turns as 500. (8)

137. What is the frequency of induced emf of an induction motor?138. Why squirrel cage induction motors are common in the domestic pump sets?139. Distinguish between squirrel cage & slip ring induction motor?140. What are the applications of induction motors?141. Name the speed control methods of a 3induction motors?142. Define a slip of an induction motor?143. What is called synchronous speed?144. Define electron volt?145. State the relationship between electric field intensity, and potential?146. An electron beam from rest is accelerated by a potential of 200V. Find the147. final velocity of the electron?148. List out the common diode applications?149. Define zener breakdown?150. Differentiate photodiode and light emitting diode.151. Explain the forward and reverse bias operation and VI characteristics of a PN

Junction diode. (16)

152. a)Derive the diode current equation? . (8)153. b)Discuss the current components of PN junction diode? (8)154. a)Explain any two applications of diode with neat diagram . (8)155. Define pinch - off voltage?156. Derive the relation between pinch - off voltage & drain current?157. What is a MOSFET?158. What is a MESFET?159. Explain the operation of PNP & NPN transistor? (12)


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160. b). What is transistor? State its types161. Compare CE CB CC Configuration? (8)162. a). Explain the input & output characteristics of CE configuration of a163. transistor?164. State FET& its types? (4)165. a)Explain the input & output Characteristic of CB configuration of a166. transistor?167. Explain the construction & characteristics of JFET168. What is a rectifier?169. Explain the operation & characteristics of TRIAC?170. Explain the operation & characteristics of UJT?


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mech beem ge2151-qb

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