Question Bank of SUB: Interconnected power system

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: Parul Upadhyay

3rd Semester (2nd Year) 2017-18 DE-I-A Electrical Engineering Students Notice

The following students have not registered yet for Design Engineering - I - A.

Revised List of 3rd Semester (2nd Year) students for DE-I-A

Find the Department Group Number and Internal Guide: Click Here

5 TH SEM, sub: EED (2150904), MANUAL (EXAMPLE DATA) FOR PRACTICAL AND DRAWING SHEET DATA

CLICK HERE FOR THE DRAWING SHEET DATA

CLICK HERE FOR THE PRACTICAL EXAMPLE DATA

3rd Semester (2nd Year) 2017-18 DE-I-A Electrical Engineering Students Notice

Following students have to yet register in GTU and in Department for the DE-I-A. Department will not be responsible if following students are not registering and informing their details in prescribed format till today evening. Today is last day for GTU registration and informing in department through google doc. Also, do not submit details more than one time.

3rd semester DE-I-A List of Group and Internal Guide

Group and Guide Information: Click Here

- If you have any change and correction meet Prof. A. M. Shah immediately.

- Contact Group no. 19 and 20 to Prof. A. M. Shah 

SUB: POWER ELECTRONICS:1 BE (ELECT)-5 SEM QUESTION BANK

SUB: POWER ELECTRONICS:1                 BE (ELECT)-5 SEM               QUESTION BANK

1.                   Explain Turn-On methods of a Thyristor.

2.                   Explain voltage rating of SCR.

3.                   Discuss construction, working & V-I characteristic of UJT.

4.                   Explain parallel operation of SCRs.

5.                   Explain Power Transistor.

6.                   What is snubber circuit ? Why is it needed ? Draw such circuit for a SCR and give guidelines for selecting it’s components.

7.                   Explain single phase full wave converter with necessary waveform.

8.                  Explain steady state V-I characteristics of power BJT. Also discuss the second breakdown phenomenon in brief.

9.                  Draw & explain dynamic turn-on characteristics of SCR.

10.              Explain two transistor analogy of an SCR.

11.              Explain RC firing circuit for SCR. Draw output voltage waveform for firing angle equal to 90 degree.

12.              What do you mean by commutation of SCR? Explain any one method in brief.

13.              A relaxation oscillator using a UJT is to be designed for triggering an SCR. The UJT has the following data :Ip =0.6mA, Vp=18V, Vv=1V, Rbb=5KΩ, ɳ=0.72, C=0.04μF, firing frequency is 2KHz, normal leakage current with emitter open is 4.2mA. Compute the values of R, R1 & R2.

14.              Write a short note on protection of SCR.

15.              Explain the working of MOSFET.

16.              Derive the expression for average output voltage, RMS output voltage for single phase half wave rectifier assuming purely resistive load. Draw necessary waveform.

17.              Explain steady state V-I characteristics of power BJT. Also discuss the second breakdown phenomenon in brief.

18.               List out the different protection is provided to SCR. Explain Crowbar protection circuit for SCR.

19.              Explain a.c phase control of TRIAC using Diac.

20.               Explain the three phase Half wave controlled rectifier with resistive load.

21.               What do you mean by pulse width modulation? What are the advantages of pulse width modulation techniques? Explain sinusoidal pulse width modulation techniques.

22.               Explain the working of step-down and step up chopper. Give the comparison between two.

23.               What is the difference between Linear voltage regulator and Switch mode power supply? Explain the working of both regulators.

24.               A single phase full converter, connected to 230V,50 Hz source, is feeding a load R=10Ω in series with a large inductance that makes the load current ripple free. For a firing angle of 45°,calculate the input and output performance of this converter.

25.               What are the control strategies for chopper? Explain in brief.

26.               Explain the operation of dual converter.

27.              Explain regenerative braking control in DC machines using chopper circuit.

28.              Derive the expression for average output voltage, RMS output voltage for single phase half wave rectifier assuming purely resistive load. Draw necessary waveform.

29.              Explain RC firing circuit for SCR. Draw output voltage waveform for firing angle equal to 90o.

30.              What do you mean by commutation of SCR? Explain any one method in brief.

NOTICE: Analog Electronics Sem: 3

Students of BE III sem Electrical Engg. are informed to prepare power point presentation and working practical model based on below mention topic and present it in front of faculty members and students. The presentation should be of 15 min. max. Submit your presentation to the respective faculty members.

Sr.	Topic
1	OPAMP as non-inverting amplifier
2	OPAMP as adder
3	OPAMP as scale changer
4	OPAMP as integrator
5	OPAMP as differentiator
6	Phase shift oscillator
7	Regulated power supply (12-0-12) volts.
8	Schmitt trigger circuit
9	OPAMP as low pass filter
10	IC 555 as astable multivibrator
11	IC 555 as bistable multivibrator
12	IC 555 as monostable multivibrator
13	Regulated power supply (15-0-15) volts.
14	OPAMP as band pass filter
15	OPAMP as high pass filter
16	OPAMP characteristics
17	Zero crossing detector circuit
18	Square wave generator
19	Saw-tooth wave generator
20	Voltage follower circuit

Note:1. last date of working practical model submission is 30/09/2017

         2. For topic selection contact Prof. Dobariya before 15/07/17.

DCT - Practical list manual for 3rd semester Electrical

CLICK HERE

Laboratory Assignments

Semester : 7^TH Electrical

Subject: Design of AC Machines

Draw & write the following Assignments from the book “ELECTRICAL MACHINE DESIGN “ by   A. K. Sawhney

(1)Draw the following parts of three phase induction motor in SHEETS

10.2,3,4,8,9,10,12,14,15,16,17,18,27,29,36,41,43

(2)Draw the following parts of three phase synchronous machine in SHEETS

11.2,3,4,5,6,8,9,13,14,15,16,17,18,21,22,26,28,45

Write the following solved examples in file page with data sheet

(A)Design problem-1

Design a 2.2KW,400V,3-ɸ,50Hz,1500rpm squirrel cage induction motor. The machine is to be started with star-delta starter, the efficiency & power factor are 0.8 & 0.825 respectively. Assume cheap design.

(B)Design problem-1

Design a water wheel generator with the following specifications:

KVA=3000,  Phase=3,  Voltage=6600V,  Frequency=50Hz,  Connection=star,  RPM=187.5,  P.F.=0.8lag

(C) Draw the circle diagram for 5HP,200V,50Hz, 3-ɸ,4-pole ,star connected induction motor from the following data:

O.C. Test	200V	5A	350W
S.C. Test	100V	26A	1700W