UPDATED BEE UNIT WISE QUESTIONS

         UNIT-1
      (A)   Theory
1. State and explain Ohms law.
2. State and explain Kirchhoff’s laws.
3. Write a short notes on basic circuit components.(About Resistor,inductor,Capacitor)
4. Discuss the different Factors on which the resistance is dependent?
5. Derive the expressions for energy stored in inductor and capacitor
6. Explain the effect of temperature on resistance.
7. Write any differences between, insulator, conductor, and semiconductor.

8. Three lamps are connected in parallel to a 200V supply. Two of the lamp currents are    I1=2A and I2=3A. If the total supply current is 9A, calculate the resistance of each of the three lamps shown in figure 1.

(B) Problems.
Solve the problems from the hard copy given and assignment
              UNIT-2
        (A)Theory

1. Explain different types of elements in detail.
2. Three resistances are connected in star, determine its equivalent delta configuration.
3. Explain dependent energy sources.
4. State and explain superposition theorem.

5. Derive the relation for conversion from delta to star connection.
6. State and explain maximum power transfer theorem.

7. state and explain Thevenin’s theorem
8. Inductances are connected in series and parallel determine equivalent inductance and capacitance

(B) Problems.
Solve the problems from the hard copy given and assignment.

                                              UNIT-3(Alternating quantities)

(A)   Theory
1.  Define the following terms
  (i)Alternating quantity (ii) waveform (iii) cycle (iv) Maximum value (v) time period (vi) frequency
  (Vii) Form factor (viii) peak factor
2. Derive the expression for root mean square value of an alternating sinusoidal current wave form I = Im Sin θ.
3. Derive the expression for average value of an alternating sinusoidal current wave form
        I = Im Sin θ.
4. Derive the expression for root mean square value of an alternating sinusoidal voltage wave form V = Vm Sin θ.

5. Derive the expression for Average value of an alternating sinusoidal voltage wave form V = Vm Sin θ.

6. Explain AC through Pure resistor

7. Explain AC through RL series circuit

8. Explain AC through RLC series circuit with phasor diagrams

1. Problems.

Solve the problems from the hard copy given and assignment

                                UNIT-4(Transformers)

1. Explain the principle of operation of a Transformer

          2   Explain the constructional details of transformer.   

3. Explain ideal transformer and practical transformer on no load with phasor diagrams and List the losses occur in transformer.

4. Derive the induced emf equation of transformer.  

5. Derive the maximum efficiency condition of a single phase transformer and Load KVA corresponding to Maximum efficiency

6. with neat circuit diagrams, explain the procedure for conducting OC and SC Tests on a given 1-ø transformer

7. Explain practical transformer on Load with phasor diagrams

8. Explain what happens if Dc supply is give transformer and why transformer is rated in KVA.

(B) Problems.

Solve the problems from the hard copy given and assignment.

UNIT WISE DESCRIPTIVE QUESTIONS(THEORY ONLY )

                                         
BEE

Note:unit wise descriptive questions(theory only problems are not included)



 UNIT-1(introduction to electrical engineering)

1. (a) State and explain Ohms law.
2.(a) State and explain Kirchhoff’s laws.
3. (a) write a short notes on basic circuit components.
4.(a) discuss the different Factors on which the resistance is dependent?
5(a).Calculate the resistance of 915 meters length of a wire having a uniform cross- sectional area of 0.77cm2 if the wire is made of copper having a resistivity of 1.7*10-6 ohm-cm.
(b) A wire of 1 m has a resistance of 2 ohms. What is the resistance of second wire, whose specific resistance is double the first, if the length of wire is 3 meters and the diameter is double of the first?
6 (a) Explain the effect of temperature on resistance.
  (b)


7. (a)derive the expressions for energy stored in inductor and capacitor

   (b)

                                          UNIT-2(Network analysis)

1( a ) Explain different types of elements in detail.

2(a) Three resistances are connected in star, determine its equivalent delta configuration.


3(a) Derive the relation for conversion from delta to star connection.


4(a) state and explain superposition theorem.


5(a) state and explain maximum power transfer theorem.


6 (a) state and explain Thevenin’s theorem


7 (a) explain different energy sources


8 (a).Explain Norton’s theorem


     
                                           UNIT-3(Alternating quantities)
1.(a) define the following terms
(i)Alternating quantity (ii) R.M.S value (iii) Average value (iv) Form factor (v) In-Phase vectors (vi) Lead-lag vectors

2 (a) Derive the expression for root mean square value of an alternating sinusoidal current wave form I = Im Sin θ.


3(a) Derive the expression for average value of an alternating sinusoidal current wave form
        I = Im Sin θ.

4(a) An alternating current is expressed as I = 14.14 Sin 314t. Determine:

1. RMS current ii) Average current iii) Form factor iv) Peak factor.

5(a) An alternating current is expressed as I = 14.14 Sin 314t. Determine:

(i)Maximum current ii) RMS current iii) Frequency iv) Instantaneous current when t = 0.02 ms.

6.

                                             UNIT-4(Transformers)

1. (a) Explain different losses in case of transformer.

2. (a) Explain the principle of operation of a Transformer

3.(a) Derive the induced e.m.f equation of transformer.

4.(a) explain the constructional details of transformer.

5.(a) explain ideal transformer on no load and practical transformer on no load.

6.(a) explain OC test and SC test on transformer.

7(a) explain practical transformer on load with phasor diagrams.


8(a). Derive maximum efficiency condition and load KVA corresponding to maximum efficiency in transformer

BEE ASSIGNMENT-2

SPHOORTHY ENGINEERING COLLEGE    

  Sphoorthy Engineering College caters to its mission providing the best infrastructure     quality education and overall personality development within the campus.                                          

    BEE

                  NOTE:  Submit the assignment on or before 22-08-2012.

                                                    ASSIGNMENT-2

1. (a) derive the effective capacitance formulae when capacitances are connected in series and parallel

(b) Find the single equivalent resistance between A and B in the circuit shown below by network reduction techniques.

                  for circuit diagram  Please go through Hard copy

(c).determine the current delivered by the source in the circuit shown below.

                      for circuit diagram  Please go through Hard copy

2.  (a) Write short notes on star – delta transformation. If Rab, Rbc and Rca are connected in delta, derive the expressions for equivalent star connection

      (b) Three resistances are connected in star, determine its equivalent delta configuration.

3.    (a) State and explain Superposition theorem.

       (b) Using superposition theorem determine the current through 12 Ω resistor

(All resistances are in Ω) as shown in figure.

4. (a) State and explain Thevenin's theorem. Explain significance of Thevenin’s theorem on network theory

    (b) By using Thevenin’s theorem determine the current through 5 Ω resistor (All resistances are in Ω) as shown in figure.

                    for circuit diagram  Please go through Hard copy

5. (a).State and explain Norton’s theorem

   (b) Find the voltage V across the 12 Ω resistance using Norton’s theorem for the circuit shown in below

6. (a) State and explain Maximum Power Transfer theorem.
   (b) Calculate the value of load resistor RL to be connected across terminals A and B which would draw the maximum power from the circuit and also find the maximum power in the circuit shown below.