3rd SEM END EXAM MODEL PAPER 2017 C-16 DEEE BRANCH

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BOARD DIPLOMA EXAMINATION, (C-14)

MODEL PAPER

EE—III SEM EXAMINATION

Exam name : ELECTRICAL CIRCUITS      Time : 3 hours

[Total Marks : 80M]

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PART-A

10x3=30M

Instructions :-

1. Answer all questions. 
2. Each question carries three marks
3. Answers should be brief and straight to the point and shall not exceed five  simple sentences.

1) Define  active and passive circuit's.
2) Define Junction, branch & loop.
3) State superposition theorem.
4) Find relation between electrical degrees and mechanical degrees.
5) Define form factor &  peak factor.
6) Convert the following rectangular to polar form and polar to rectangular form.           i) 16 + j 12     ii)  50 L-600 .
7) The current flowing through a pure inductor is 20A ,find inductance  and power consumption when the voltage applied across is V = 200sin(314t).
8) why series renounces circuit is called  acceptor circuit.
9) State the condition for resonance in parallel circuit.
10) Three impedance each of 10 Ω Resistance, 5 Ω inductive reactance is connected in delta to a 400V 3 phase supply determine line current, power factor.

PART-B

12×5=60M

Instructions :

1. any five questions
2. Each question carries 12 marks.
3. Answers should be comprehensive and the criterion for valuation is the content but not the length of the answer.

11)  A) Derive transformation formula for star to delta transformation.
B) Determine equivalent resistance between AB.

12)   Find  the  current  in  each  resistor  using  Kirchhoff  law. 

13)  a)   State  thevenins theorem.

b) Find  the  value  of  R  for which  the  observed  power  will be  maximum  also  find maximum  power in  RL

14)  a) Determine  average  value  of  sinusoidal  wave.

b)  The  equation  of  an  alternating  current  is   I  = 42.42  sin  (628t)  Determine  its

i) RMS value

ii)  Average  value

iii) Frequency

iv)  Form  factor 

v) Peak  factor and determine average  value  of  sinusoidal wave.

15) A) Derive  the  formula  for Impedance,  Current,  Phase  angel, Power, Power factor in RL  series circuit. 

b)  A  coil  of  resistance  20ohm  and  an  inductance  of  20mH is connected  in  series with  100µF capacitor across 200V  supply  find  resonant  frequency.

16)   Two  inductive  impedance  A  &B  are connected  in  series.

A   has   R=5  ohm  ,   L=0.01H .

B  has   R=3  ohms   &  L=0.02H.

If  sinusoidal voltage  is applied  to  whole circuit calculate  impedance  of  each  coil  the  current  ,Power factor, voltage  drop  across each  coil   and  draw  vector diagram  .

17)   In  a  series parallel circuit shown  in  fig  the  parallel branch  A&B  are in  series with  C. The  impedance   are   ZA  =  (6  +  j5)  ZB =  (4  +  j3)  ZC=   (10  -  j7)  .  If  voltage  applied across the  circuit  is  200  V  at  50Hz.   Calculate  current  in  each  branch  and  total  current and   draw  vector diagram.

18)  a)   Prove  that  in  delta  connected  system  line  current  is  √3  times phase  current.

b)  A  3phase  50  Hz ,400V   induction  motor operated  on  full  load  with  an  efficiency of   85%   and power  factor of  0.85  .Calculate  the  readings of  two  watt  meters connected to  measure the  power in  the  motor.   

MODEL PAPER

EE-303 -POWER SYSTEM I For (DEEE) III Semester 

Diploma Examination 

Time 3 Hours

Total Marks : 80M 

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PART-A

10x 3=30M

Note: 

1. Answer all questions and each question carries three marks.
2. Answer should be brief and straight to the point and shall not exceed five simple sentences.

1. State the advantages and disadvantages of solar power.
2. State the causes of pollution in thermal power plant.
3. Define energy audit.
4. State the need of surge Tank in hydel power plant.
5. State the advantages of hydro Electric power plant.
6. State the materials used for coolant reflector and control rods in nuclear reactor.
7. Define the terms nuclear fission and nuclear fusion.
8. State the working function of flat plate solar collector.
9. Define tariff and state its types.
10. State the need for integrated operation of power stations.

PART-B

10 x 5=50M

Note:-

1. Answer any five questions and each question carries ten marks.
2. The answer should be comprehensive and the criteria for valuation are the content but length of the answer.

11. Explain the function of each block of thermal power plant with line diagram.
12. Explain the working of medium head hydro-electric power plant with neat Sketch.
13. (a) Derive the water power equation in hydel power plant.
(b) State the factors which will affect the selection of site for hydel Power plants.
14. Explain the working of reactors in nuclear power station.
15. Explain the construction and working of flat plate collector with a neat diagram.
16. Explain the working of wind mill with a neat sketch.
17. Define tariff and explain various types of tariffs.
18. A generating station has a maximum demand of 100 MW the following data refer to the power station.
(i) Interest and Depreciation = Rs 10%
(ii) Capital Cost = Rs 150 x 106
(iii) Annual Cost of fuel oil = Rs 6 x 106
(iv) Taxes Wages and Salaries = Rs 5 x 106
(v) Annual load factor = 60%
Calculate
(a) Fixed Cost
(b) Running Cost
(c) Energy generated per annum (d) Cos per Unit. 

SBTET,TS

C-16 -EE-304

BOARD DIPLOMA EXAMINATION,(C-16)

DEEE-SECOND YEAR,
THIRD SEMESTER EXAMINATION
DEEE-304, DC MACHINES         Time:3 hours

Total Marks:80

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PART-A

3×10=30M

Instructions:

1. Answer all questions.
2. Each question carries three  marks.

1. State  Fleming’s  Right  Hand rule.
2. Classify DC generators based on field excitation.
3. Define (i) Lap winding (ii) Wave winding.
4. State the methods to improve commutation.
5. Define (i) critical resistance (ii) critical speed .
6. State the working principle of a  DC motor.
7. Draw the power flow diagram of a DC motor.
8. What is the necessity of starter for a DC motor .
9. List the different methods of speed control of DC motors.
10. State the advantages of Swinburne’s test.

PART-B

10×5=50M

Instructions:-

1. Answer any five questions.
2. Each question carries ten marks.

11.
(a) Derive EMF equation of a DC generator. 5M
(b) A shunt generator delivers 450A at 230V and the resistance of the shunt field and armature are 50 Ω and 0.03 Ω respectively. Calculate the generated  EMF .  Neglect brush drop. 5M
12.
(a)Derive the condition for maximum efficiency of a DC generator. 5M
(b)A 10 kW 250 V DC shunt generator has total rotational losses of 600 W. Its armature and shunt field resistance are 0.5 Ω and 125 Ω respectively. Calculate the efficiency at rated load. 5M
13. Derive the expressions  for  Demagnetizing  Ampere Turns per pole (ATd) and Cross Magnetizing Ampere Turns per pole(ATc) of DC generator.
14.(a). Explain the working of welding generator. 5M
(b). Explain the Internal and external characteristics of  DC shunt generator.5M
15.A 460 V DC series motor runs at 500 rpm and draws a current of 40 A. Calculate the speed and percentage change in torque if the load is reduced so that the motor draws 30A.Total resistance of the armature and field circuit is 0.8 Ω.  Assume flux is proportional to field current.
16.
(a).  Draw the electrical and mechanical characteristics of DC Series motor.  5M
(b). Mention one application of each type of self excited DC motors. 5M
17. Explain the working of 3-point starter with a neat sketch .
18. Explain  Swinburne’s  test with advantages and disadvantages.

BOARD DIPLOMA EXAMINATION, (C-16)OCT/ NOV -2017

DEEE- III SEMESTER EXAMINATION

ELECTRICAL AND ELECTRONICS MEASURING INSTRUMENTS 
Time: 3 hours

Total marks: 80M

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PART-A

10X3=30

Instructions:-

1. Answer all questions
2. Each question carries three marks

1. State different types of measuring instruments based on their working principle.
2. State
(a) Accuracy
(b) Resolution.
3. Calculate the shunt required to extend the range of moving coil ammeter, which takes 20ma to measure 20a.if the resistance of the coil is 0.075ohms.
4. Define creeping error and write its adjustment.

5. Classify the resistance based on their values.

6. Write the applications of potentiometer.
7. Define
a) Transducer
(b) sensor
8. Write the applications of thermistors.
9. Draw the block diagram of digital voltmeter.
10. Write advantages of digital energy meter.

PART-B

5x10=50M

Instructions:-

1. Answer any five questions
2. Each question carries ten marks

11.
(A) Explain construction and working of PMMC.
(B) State the errors present in moving iron instrument.
12. Explain construction and working of dynamometer wattmeter with neat sketch.
13.
(A) State the precautions to use the current transformer in measuring instruments.
(B) A 230v, 1-φ energy meter has a constant load current of 4a passing through the meter for 5hrs at upf. If the meter disc makes 1104 revolutions during this period, what is the meter constant?
14. Explain construction and working of 3-φ energy meter with neat sketch.
15. Explain measurement of insulation resistance by using Megger with neat sketch.     
16.
(A) Write the disadvantages of thermo couple.
(B) Explain construction and working of LVDT with neat sketch.
17. Explain working of digital multimeter with neat sketch
18.
(A) State different torques developed in measuring
instruments.
(B) Compare Analog and Digital measuring instruments.

MODEL PAPER

DEEE 2nd year III sem(C-16)

Subject Title: Electronics Engineering
Subject Code: EE-306

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PART-A

Answer all questions. Each carries 3 marks.

10X3=30M

1. State the need for filter and List the different types of filters?
2. State the need of DC Power Supply?
3. Draw the symbols of JFETs?
4. Draw the practical transistor CE amplifier?
5. What is biasing of the transistor amplifier ?
6. Distinguish between voltage and power amplifier?
7. Classify different type’s oscillators?
8. What is Barkausen criteria?
9. List the applications of CRO?
10. State the need for timer?

PART-B

Answer any five questions. Each carries 10 marks.

5X10=50M

11.
Explain the working principle of full wave rectifier with centre tapped transformer using P.N junction diodes with waveforms?
12.
Explain the construction, working principle and applications of JFET?
13.
Explain potential divider biasing method?
14.
a) Draw the circuit diagram of bridge rectifier using filter?
b) Classify amplifiers on the basis of frequency, function, period of Conduction?
15.
Draw and explain the function the practical transistor CE amplifier?
16.
Explain the principle of operation of two-stage RC coupled amplifier with circuit diagram?
17.
Explain the working principle of RC Phase shift Oscillator?
18.
Describe the functions of different parts of CRO?