Basic Electrical and Electronics Engg - FT students

Department of Electrical and Electronics Engineering

QUESTION BANK

Subject: - 185203-Basic Electrical and Electronics Engg

Class: 1 FT                                                                                       

UNIT-I

PART – A (10 x 2 = 20)

1. State ohm’s law.
2. Mention the advantages of ohm’s law.
3. State kirchoff’s laws
4. What is meant by electric energy?
5. Distinguish between power and energy.
6. What are lumped circuits?
7. Write the equivalent resistance when two resistors are connected in parallel?
8. Write the expression to find the average value of a sinusoidal wave?
9. Define RMS value.
10. Define Peak factor.
11. Draw power triangle.
12. Define the term Instantaneous value.
13. Define the term Average value.
14. Define form factor.
15. What is creeping of a meter?
16. What is the basic operation principle of PMMC Instrument?
17. What are the advantages and disadvantages of PMMC Instrument?
18. Mention the two types of MI instrument.

PART – B

19. State and explain kirchoff’s laws.                                                                    (16)
20. Give the algorithm for solving a circuit problem using mesh analysis.      (8)
21. What are the points to be considered for mesh analysis? Calculate the current    through 6 Ω resistance using mesh analysis in fig.                                                 (16)

                  

22. A coil of resistance 10 ohms and inductance 0.1 H is connected in series with a 150 µF capacitor across 200 V, 50 Hz supply. Calculate i) Inductive reactance, Capacitive reactance, impedance, current and power factor and ii) the voltage across the coil and  capacitor respectively.                                                                                         (16)
23. With the neat diagram, explain in detail on the three phase balanced circuits.   (16)            
24. A series circuit has R = 10 ohm, L = 50 mH and C = 100 µF and is supplied with 200 V ,50 Hz. Find i) the impedance, ii) the current, iii) the power iv) the power factor and v) the voltage drops across each element.(16)
25. With the neat diagram, explain in detail on the single phase balanced circuits.   (8)
26. A circuit is composed of a resistance 6 Ω and a series capacitive reactance of 8 Ω. A voltage e(t) = 141 sin 314 t is supplied to the circuit. Find i) Complex  impedance,   ii) Effective value of current, iii) Power delivered to the circuit, iv) Capacitance of the capacitor.                                                                                                                        (16)
27. Discuss the classes of systematic error giving suitable example for each type.   (8)
28. Write short note on Constructional features of Energy meter.                              (8)
29. With suitable diagram, describe the working principle of moving coil Ammeter and Voltmeter.                                                                                                                  (16)
30. Explain the working principle, construction of PMMC type ammeter Permanent Magnet Moving Coil (PMMC) Instruments.                                                            (16)
31. Explain briefly about Dynamo meter type wattmeter? Derive the torque equation and give its error.                                                                                                                        (16)

                                                                                                                                       

UNIT-II

PART – A (10 x 2 = 20)

1. What is basic principle of dc generator?
2. What are the basic parts of dc generator?
3. What is the purpose of yoke in dc machine?
4. Mention the two different types of armature winding in dc machines.
5. What is the function of commutator in dc generator?
6. Write down the e.m.f equation of a d.c generator.
7. What are the different types of dc motor?
8. What is basic principle of dc motor?
9. Why series motor cannot be started without any load?
10. Define the term speed regulation of a dc motor? 
11. Write down the torque equation of a d.c motor.
12. What is meant by transformer? Write down the e.m.f equation.
13. Define transformation ratio.
14. What is all-day efficiency of a transformer? 
15. Why the transformer rating is in KVA?
16. Define slip of an induction motor?
17. What are the different types of single phase induction motor?
18. Define slip of an induction motor?

     

 PART – B

19. Draw and explain the principles of operation and constructional details of a DC generator.(16)
20. A 200V, shunt motor develops an output of 17.158 kW when taking 20.2 kW.The field resistance is 50Ω and armature resistance 0.06 Ω. Calculate the efficiency and power input when the output is 7.46 kW.(16)
21. Derive the emf equation of a DC generator.(8)
22. Explain the working principle of d.c motor and also describe the production of back emf in it.(16)
23. Describe the construction details of transformer and also explain the principle of operation.(16)
24. Derive the EMF equation of a transformer.(8)
25. Draw and explain the core type and shell type transformers.(16)
26. State and Explain double revolving field theory of 1φ induction motor.(16)
27. Explain the principle of operation of capacitor start and capacitor run induction motor.(16) 
28. Explain the principle of operation of Split phase induction motor.(8)

UNIT-III

PART – A (10 x 2 = 20)

1. Define forbidden energy gap.
2. Define a semiconductor.
3. What is intrinsic semiconductor?
4. What is extrinsic semiconductor?
5. What is Fermi level?
6. What is meant by doping in a semi conductor?
7. What is P- type and N-type semiconductor?
8. Distinguish between intrinsic and extrinsic semiconductor.
9. Compare N type and P type semiconductor.
10. What are minority and majority carriers in a semiconductor?
11. What is meant by energy band?
12. Define filter circuit.
13. What are the advantages and disadvantages of full wave rectifier?
14. Define peak inverse voltage.
15. Differentiate Avalanche breakdown and Zener breakdown.
16. What is cut-in voltage?

PART – B

17. Describe the working of a PN junction diode with neat diagrams. Also explain its V-I characteristics.(16)
18. Write down the operation of PNP & NPN transistor.(16)     
19. Describe the operation of full wave rectifier and also derive its rectifier efficiency, voltage regulations and ripple factor.(16)
20. Describe the operation of half wave rectifier. And also derive its rectifier efficiency, voltage regulations and ripple factor.(16)
21. Compare HWR and FWR.(8)
22. Explain how will obtain the static characteristics of bipolar junction transistor in CE configuration.(8)
23. Explain the input and output characteristics of a transistor in CB configuration.(8)
24. Compare CE,CB and CC transistor configuration

i. in terms of input impedance, output impedance, current gain and voltage gain.

ii. Draw the output characteristics of CE configuration and mark its regions of operation.(16)

25. Compare the performance of a bipolar junction transistor in different configurations.(8)
26.  Explain in detail about small signal CE amplifier.(8)

                               

UNIT-IV

PART – A (10 x 2 = 20)

1. Add the numbers (101101101)² and (1110011)².
2. Convert 21.6 into its binary equivalent.
3. Add 1A816 and 67B16.
4. Apply Demorgan’s theorem to implement A.B = A+B with any gate.
5. Give the truth table of NAND gate.
6. Draw the symbolic representation of two input NAND gate and its truth table.
7. Convert the given expression in standard sum of product form.                   
8. Give the truth table of XNOR Gate.
9. State the advantages and limitations of ripple counter.
10. Give the various drawbacks suffered by variable resistive divider type of D/A converters.
11. State and prove Demorgan’s theorem.
12. Draw the circuit of a half adder.
13. Draw the logic circuit for half adder.
14. What is a flip-flop?
15. What is counter?
16. What are shift register?

PART – B

27. Design a logic circuit to simulate the function f(A,B,C) = A(B+C) by using only NAND gates.(16)
28. What are universal gates? Explain their principle of working with necessary truth table.(16)
29. Design a full adder circuit using only NOR gates and write its truth table.(16)
30. Explain half adder and full adder. (16)
31. Briefly explain the working of JK flip flop and RS flip flop.(16)
32. Briefly explain the working of D flip flop and T flip flop.(16)
33. What are the types of shift register? Explain any one type.(16)
34. Explain the working of a 4-bit asynchronous counter and state its primary disadvantages. (8)
35. Write in detailed about Analog to Digital converter.(8)

UNIT-V

PART – A (10 x 2 = 20)

1. Define Communication system.
2. Draw the block Diagram of Communication system.
3. What are the types of Communication?
4. What is the difference between analog and digital signals?
5. What is a transducer?
6. Define Amplitude Modulation.
7. What is the bandwidth of amplitude modulation?
8. Define Frequency modulation.
9. Compare AM and FM.
10. Define PAM.
11. Define PPM.
12. Define PWM.
13. What is meant by sampling?
14. Draw the block diagram of satellite communication system.
15. Draw the frequency spectrum of TV signal.
16. Draw the general block diagram of FAX.

PART – B

17. Draw the block diagram of communication system and explain its operation.(16)
18. Discuss in detail on the frequency modulation techniques.(8)
19. Draw the block diagram arrangement of an AM broadcast transmitter and explain its operation.(16)
20. With a neat block diagram, Explain the working principle of TV transmission and receiving system.(16)
21. Explain in detail about FAX.(8)
22. With a neat block diagram, Explain the working principle of Microwave communication system.(16)
23. Explain the functions of Communication satellites.(8)
24. With neat block diagram explain the operation of optical fiber communication technique and mentions its applications.(16)