2-1 external exams time table

2-1 EXTERNAL EXAMS TIME TABLE

20-11-2012  (TUESDAY)	22-11-2012 (THURSDAY)	24-11-2012 (SATURDAY)	27-11-012 (TUESDAY)	29-11-2012 (THURSDAY)	01-12-2012 (SATURDAY)
PROBABILITY & STATISTICS     (p&s)	ELECTRONIC DEVICES AND CIRCUITS   (EDC)	MATHEMATICAL FOUNDATIONS OF COMPUTER SCIENCE (MFCS)	DATA STRUCTURES THROUGH C++	DIGITAL LOGIC DESIGN (DLD)	BASIC ELECTRICAL  ENGINEERING     (BEE)

for more details check the following link

http://jwfiles.net/files/6/panxottnn4e4wy/II_YEAR_I_SEM.R09.pdf

Hoping for excellent performance in  2-1 exams.........
                                     

BEE LAST 4 UNITS BITS EXAM ON OCTOBER 6TH

      BEE BIT EXAM (DC.Generators,DC motors,3-Phase induction motors(A.C machines),Basic instruments) on October 6th 2012:

Hi  All ,

There will be Bit exam on (Fill in the blanks,50 questions) on October 6th .prepare well for the exam.

                                                       ALL THE BEST

BEE First Mid Bit Paper

BEE first Mid Bit paper with answers will be posted soon.....

Guidelines for Writing EE Lab manuals(part-A)

Guidelines for writing EE lab manual:-

1.Follow the guidelines which are told in the lab.some important guide lines are listed here.2.Leave the 3 pages before starting first expirment.3.On the right hand side write aim,apparatus required,Theory(in case of theorems statement of the theorem must be included),Procedure, formulas  (any formulas are there) ,precautions.4.on  the left hand side circuit diagrams(given circuit then different cases diagrams, theoretical calculations,observation table, comparison table,model graph) should be written with pencil..

EXPERIMENTAL VERIFICATION OF THEVENIN’S THEOREM

   

        AIM:  To determine the Thevenin’s equivalent circuit for the given circuit and verify the theorem.                                         
       APPARATUS REQUIRED:                        

S.NO	Name of the equipment	Range	Qty

       CIRCUIT DIAGRAM:
     Given circuit:

             
Case1:   Measure the current through RL=560 Ω in original circuit (IL1)

                           

Case2:   Measure current through RL=560 Ω from Thevinins equivalent circuit(IL2):
(a) Thevinin’s resistance(Rth):

               

(b)   Thevinin’s voltage(Vth):

                     
 (c)   Current through RL from Thevinins equivalent circuit(IL2):

              
                                

        Theory:-

                            Statement:   Any two terminal linear network having a number of voltage current sources and resistances can be replaced by a simple equivalent circuit consisting of a single voltage source in series with a resistance, where the value of the voltage source is equal to the open circuit voltage across the two terminals of the network, and resistance is equal to the equivalent resistance measured between the terminals with all the energy sources are replaced by their internal resistances.

    PROCEDURE:

1.       Connect the circuit as shown in the figure.

2.       Apply   16V voltage at the input terminals of the circuit.

3.    Measure the load current IL in the load resistor RL with the help of ammeter.

4.    Short circuit the input voltage V1 and remove the load resistor and measure the equivalent resistance at open circuited terminals i.e Thevenin’s resistance(Rth)

5.    Remove the load resistor and measure the open circuit voltage VOC or VTH across the load terminals.

6.    Now connect the Thevenin’s equivalent circuit and apply the input voltage equal to Voc or  Vth.

7.    Measure the load current in this equivalent circuit and this value of the current must be same as in the original circuit.

8.    Hence theorem is verified.

     OBSERVATION TABLE:
   Observation table:

Current from original circuit (IL1)	THEVININ’S  RESISTANCE (RTH)	THEVININ’S VOLTAGE(Vth)	Current from Thevinins equivalent circuit  (IL2)

Comparison Table:

	IL1	Rth	Vth	IL2
THEORITICAL
PRACTICAL

         Precautions:

1.       The connections should be correct.

2.       The input voltage supply should be within the limit so that it does not change the network components.

3.       Note down the readings without any parallax error.

    Result: -
         

EE Lab Manual Part A expirments

Part -A of EE Lab expirments Manual  will be posted  soon.............

BEE assignment-3,4

                                                         ASSIGNMENT-3
                                            Unit-3(ALTERNATING QUANTITIES).
1. Define the following terms.
(A) Alternating quantity (B) Waveform (C) Frequency (D) Time period (E) Instantaneous value (F) Average value (Mean) (G) RMS value (H) Peak Value (Maximum value) (I) form factor
2. (A) Derive the expression for root mean square value (Effective value or virtual value) of an alternating sinusoidal voltage wave form e = em Sin θ. (Using mid ordinate method and Analytical method)

 (B)   Derive the expression for Average value (Mean value) of an alternating sinusoidal current i = im Sin θ

3. (A) explain Addition phasor using Parallelogram method and Method of components.

4. (A) (A) Explain A.C through pure inductor and Show that power dissipated by a pure inductor exited by a sinusoidal voltage source V = Vm Sinωt is Zero.

  (B) Show that power dissipated by a pure capacitor exited by a sinusoidal voltage source V = Vm Sinωt is Zero.

5. (A) Explain Ac through RC series circuit with phasor diagrams.

   (B) Explain AC through RLC series circuit with Phasor diagrams and Explain Resonance in RLC series circuit.

****6. (A) A reactor having negligible resistance and an inductance of 0.1 H is connected in series with a resistor of 15 ohms. The circuit is connected across a 230 V, 50 Hz, Single phase AC supply. Find

i) Current flowing through the circuit

ii) Power factor of the circuit

           iii) Voltage across the reactor.

**** B) A capacitor of 100 μF is connected across 200 V, 50 Hz, Single phase supply. Calculate

i) The reactance of the capacitor

ii) RMS value of the current

iii) The maximum value of the current

**** 7. (A)Find the active and reactive components of the current taken by a series circuit Consisting of a coil of inductance 0.1 H and resistance 8 and a capacitor of 120 μF connected to a 240 V, 50 Hz supply?

            (B)A conductor carries a sinusoidal A.C peak value 12 Amps superimposed on an direct current of 12 Amps.. Find the RMS value of resultant current.


     8. (A) A coil of resistance R and inductance L is connected across 100v 50Hz supply. The current through the coil is found to be 2A and the power dissipated is 100W.find R and L

        (B) An alternating current is given by the equation i=100 Sin(314t) find (i) maximum value (ii)frequency   (iii) Time period  (iv) value of current after t=0.01 sec



                                                           ASSIGNMENT-4
                                                     Unit-4(TRANSFORMERS).

1. (A) Explain the working principle of 1-Ø (Single phase) Transformer and what happens If DC supply is given to transformer?

(B) Derive the induced emf equation of transformer

2. (A)Explain the losses that occur in Transformers

(B) (A) Derive the maximum efficiency condition and expression for load KVA corresponding to Maximum efficiency

3. (A) Draw the phasor diagram of Transformer under no load.(IDEAL T/F AND PRACTICAL T/F)

(B) Draw the phasor diagram of transformer on load (consider resistance and leakage reactance)

4. (A)Define efficiency and regulation of a Transformer. Explain how will you pre - determine the efficiency and regulation with neat circuit diagrams.

                                       (OR)

Explain OC and SC tests on single phase transformer to determine regulation and efficiency

           (B) Explain why the transformer is rated in KVA instead of KW.
    5.  (a)A single phase transformer working at unity power factor has an efficiency of 90 % at both one half load and at the full load of 500 W. Determine the efficiency at 75 % of full load.

         (b) A 100 kVA, 1000/10000 V, 50 Hz, Single phase transformer has an iron loss of 1100 W. The copper loss with 5 A in the high voltage winding is 400 W. Calculate the efficiency at 25 %, 0.8 Power factor. The output terminal voltage being maintained at 10000 V.

5. (A).a 200/400V, 50 Hz1-phase  transformer on test gave the following readings,

OC Test (LV):200V, 0.7A, 70w,

SC Test (Hv); 15V, 10A, 80W.

Find the voltage regulation at 0.8 pf lagging at full load.

(B) A100KVA lighting transformer has full load loss of 3 KW; the loss is being equally divided between iron and copper. During a day the transformer operates on full load for 3 hours, on half load for 4 hours, the output being negligible for the remaining day.Caluculate the all day efficiency

6. (A)A 220/110V,50Hz,1.5KVA transformer has primary and secondary winding resistance of 1ohm and 2 ohm respectively and reactance of 3ohm and 5ohm respectively. Find the total resistance, equilibrium reactance and impedance referred to primary and secondary

(B).The required no load voltage ratio in a 150 KVA, 50Hz single phase transformer is 5000/250V.find the efficiency at half rated KVA. Unity power factor and also efficiency at full load 0.8 PF lagging if the full load copper losses are 1800watt, core losses are 100W.


    





   

        
   

.

BEE Assignment-3, Assignment-4

                                                          ASSIGNMENT-3

                                             Unit-3(ALTERNATING QUANTITIES).

1. Define the following terms.

(A) Alternating quantity (B) Waveform (C) Frequency (D) Time period (E) Instantaneous value (F)Average value (Mean) (G) RMS value (H) Peak Value (Maximum value) (I) form factor

2. (A) Derive the expression for root mean square value (Effective value or virtual value) of an     alternating sinusoidal voltage wave form e = em Sin θ. (Using mid ordinate method and Analytical

method)

  (B)   Derive the expression for Average value (Mean value) of an alternating sinusoidal current i = im

Sin θ

3. (A) explain Addition phasor using Parallelogram method and Method of components.

4. (A) (A) Explain A.C through pure inductor and Show that power dissipated by a pure inductor

exited by a sinusoidal voltage source V = Vm Sinωt is Zero.

 (B) Show that power dissipated by a pure capacitor exited by a sinusoidal voltage source V = Vm

Sinωt is Zero.

5. (A) Explain Ac through RC series circuit with phasor diagrams.

 (B) Explain AC through RLC series circuit with Phasor diagrams and Explain Resonance in RLC

series circuit.

****6. (A) A reactor having negligible resistance and an inductance of 0.1 H is connected in series with

a resistor of 15 ohms. The circuit is connected across a 230 V, 50 Hz, Single phase AC supply. Find

i) Current flowing through the circuit

ii) Power factor of the circuit

            iii) Voltage across the reactor.

**** B) A capacitor of 100 μF is connected across 200 V, 50 Hz, Single phase supply. Calculate

i) The reactance of the capacitor

ii) RMS value of the current

iii) The maximum value of the current

**** 7. (A)Find the active and reactive components of the current taken by a series circuit Consisting

of a coil of inductance 0.1 H and resistance 8 and a capacitor of 120 μF connected to a 240 V, 50 Hz

supply?

             (B)A conductor carries a sinusoidal A.C peak value 12 Amps superimposed on an direct

current of 12 Amps.. Find the RMS value of resultant current.

      8. A coil of resistance R and inductance L is connected across 100v 50Hz supply. The current

through the coil is found to be 2A and the power dissipated is 100W.find R and L

                                                            ASSIGNMENT-4

                                                      Unit-4(TRANSFORMERS).

1.(A) Explain the working principle of 1-Ø (Single phase) Transformer and what happens If DC

supply is given to transformer?

(B) Derive the induced emf equation of transformer

2.(A)Explain the losses that occur in Transformers

(B) (A) Derive the maximum efficiency condition and expression for load KVA corresponding

to Maximum efficiency

3.(A) Draw the phasor diagram of Transformer under no load.(IDEAL T/F AND PRACTICAL

T/F)

(B) Draw the phasor diagram of transformer on load (consider resistance and leakage

reactance)

4.(A)Define efficiency and regulation of a Transformer. Explain how will you pre - determine the

efficiency and regulation with neat circuit diagrams.

                                        (OR)

 Explain OC and SC tests on single phase transformer to determine regulation and efficiency

            (B) Explain why the transformer is rated in KVA instead of KW.

     5.  (a)A single phase transformer working at unity power factor has an efficiency of 90 % at both one

half load and at the full load of 500 W. Determine the efficiency at 75 % of full load.

          (b) A 100 kVA, 1000/10000 V, 50 Hz, Single phase transformer has an iron loss of 1100 W. The

copper loss with 5 A in the high voltage winding is 400 W. Calculate the efficiency at 25 %, 0.8 Power

factor. The output terminal voltage being maintained at 10000 V.

5.(A).a 200/400V, 50 Hz1-phase  transformer on test gave the following readings,

OC Test (LV):200V, 0.7A, 70w,

SC Test (Hv); 15V, 10A, 80W.

Find the voltage regulation at 0.8 pf lagging at full load.

(B) A100KVA lighting transformer has full load loss of 3 KW; the loss is being equally divided

between iron and copper. During a day the transformer operates on full load for 3 hours, on half

load for 4 hours, the output being negligible for the remaining day.Caluculate the all day efficiency

6.(A)A 220/110V,50Hz,1.5KVA transformer has primary and secondary winding resistance of

1ohm and 2 ohm respectively and reactance of 3ohm and 5ohm respectively. Find the total

resistance, equilibrium reactance and impedance referred to primary and secondary

(B).The required no load voltage ratio in a 150 KVA, 50Hz single phase transformer is

5000/250V.find the efficiency at half rated KVA. Unity power factor and also efficiency at full load 0.8

PF lagging if the full load copper losses are 1800watt, core losses are 100W.