2007 Anna University Chennai B.E Electrical and Electronics Engineering B.E./B.Tech DEGREE EXAMINATION, MAY/JUNE 2007,Seventh semester,Electrical and Electronics Engineering,EE 1001 – SPECIAL ELECTRICAL MACHINES Question paper:


B.E./B.Tech DEGREE EXAMINATION, MAY/JUNE 2007
Seventh semester
(Regulation 2004)
Electrical and Electronics Engineering
EE 1001 – SPECIAL ELECTRICAL MACHINES
(Common to B.E.(Part Time) Sixth Semester regulation 2005)
Time : Three Hours Maximum: 100 marks
Answer all questions
PART A –(10x2=20)

1. What is the main advantage of synchronous reluctance motor?
2. List the application of synchronous reluctance motor.
3. Define the term step angle.
4. What is meant by detent torque?
5. What is the significance of closed loop control in switched reluctance motor?
6. List out the advantages of switched reluctance motor.
7. What are the types of materials used in PMDC motors?
8. State some important applications of PMDC motor?
9. How a permanent magnet synchronous motor is stated?
10. What are the advantages of permanent magnet synchronous motor?

PART B – (5x16 = 80 marks)

11.(a) Describe the construction working and uses of a reluctance motor. (16)
(OR)
(b) Draw and explain a typical torque speed characteristics of a reluctance motor. Compare a reluctance motor with an equivalent induction motor. (16)

12. (a) describe the operation of a variable reluctance type stepper motor. What is meant by micro stepping also explain? (16)
(OR)
(b) (i) Explain the working of a hybrid stepper motor. (8)
(ii) Draw and explain the torque pulse rate characteristics of stepper motor. (8)

13.(a) With neat diagram, explain the construction and working of switched reluctance motor. (16)

(OR)

(b) (i) With neat diagram, explain the importance of closed loop control in SR motor. (10)
(ii) Compare SR motor with VR stepper motor. (6)

14.(a) Describe the construction of a permanent magnet dc motor. What are the advantages and disadvantages of PMDC motors compared with conventional shunt dc motors? (16)

(OR)
(b) (i) Explain the speed torque characteristics of PMDC motor. (8)
(ii) Write a note on power controllers used in PMDC motor. (8)
15. (a) Explain the construction and performance of permanent magnet synchronous motor with neat diagram. (16)

(OR)
(b) Clearly explain the microprocessor based control of PMSM. (16)

2010 Anna University Chennai B.E Electrical and Electronics Engineering Ee340 - micro processor and applications Question paper:

B.E./B.Tech. DEGREE EXAMINATION,APRIL/MAY 2010
VI - SEMESTER
B.E. ELECTRICAL AND ELECTRONICS ENGINEERING
EE340 - MICRO PROCESSOR AND APPLICATIONS

Time: 3hrs. Max Marks: 100
Answer all Questions
PART – A (10 x 2 = 20 Marks)

1. Distinguish between wait state and bus idle condition.

2. What is the need for timing diagram?

3. What is the function of queue in 8086 microprocessor?

4. What is the advantage of using an internal register for temporary data storage over the memory location?

5. What are the features of 8051 micro controller?

6. What is the function of watch dog timer in 8096 micro controller?

7. Mention the advantage of memory mapped I/O.

8. What is meant by multiplexed scanned seven segment LED display interfacing?

9. What is the need for 8254 programmable interval timer and mention its applications?

10. What are the functions performed by the Intel 8251 USART?

PART – B (5 x 16 = 80 Marks)

11. Draw the functional block diagram 8031 microcontroller and explain the function
of each block. (16)

12.a)i) Draw the organization of a 8085 based micro computer system and explain. (10)

ii) Explain the various addressing modes in 8085 processor. (6)

OR

12.b)i) Draw and discuss the timing diagram for memory read operation of 8085 processor. (8)

ii) Explain the different techniques used for interfacing I/O devices with 8085 processor. State the merits and demerits of each. (8)

13.a)i) How is pipelined architecture implemented in 8086 processor? (10)

ii) Draw and explain the memory structure of 8086 processor. (6)

OR

13.b) Draw the complete schematic of 8086 processor memory interface in minimum mode with the following specification.
i. 16K of EPROM
ii. 32K of RAM. Also indicate the address map. (Use separate chip for odd and even memory) 16)

14.a)i) Design a seven segment LED output port with device address F5 H, using a 74LS138 3-to-8 decoder, a 74LS20 4 input NAND gate, a 74LS02 NOR gate and a common anode seven segment LED. (10)

ii) Compare memory mapped I/O and I/O mapped I/O structure. (6)

OR

14.b) Interface DAC 0808 with 8085, use 8255 PPI as a parallel port to send digital data to DAC. Write a program to generate square wave using the above hardware. (16)

15.a)i) What are the over heads associated with interrupt driven input-output and how are they reached using DMA? (4)

ii) Explain the operation of 8257 direct memory access controller with its functional block diagram. (12)

OR

15.b) Explain the need and the features of the following ICs: (16)

(i) The Intel 8259 – Programmable Interrupt Controller. (ii) The Intel 8279 – Key board/ Display controller.

Anna University Questions papers - Electrical Engineering

2011 Anna University Chennai, B.E Electrical and Electronics Engineering B.E/B.Tech. Degree Examination, April/May 2011, Eight semester, Electrical and Electronics Engineering, EC1451A – MOBILE COMMUNICATION Question paper:


Part-A
(10*2=20)

1. Define trunking efficiency and Grade of Service.
2. Define coherence bandwidth.
3. Distinguish between soft and hard handoff.
4. What are the advantages of the two ray ground reflection model in the analysis of path loss?
5. What is Doppler shift?
6. Distinguish linear and non-linear equalization.
7. Define CDMA.
8. What are the criteria for choosing speech codec for mobile communication?
9. What is the operating frequency range of Bluetooth devices?
10. Define GSM.


Part-B
(5*16=80)

11.(a) With suitable timing diagram, explain how a call is made between cellular users.(16)
Or

(b)(i) Explain the frequency reuse concept in cellular technology.(8)
(ii) Explain the channel assignment strategy in cellular systems.(8)

12.(a)(i) Explain how the diffraction affects the signal propagation using knife edge diffraction model.(8)
(ii) Explain the propagation of signal in outdoor using Durkin's model.(8)
Or
(b) Explain the different techniques used for increasing the capacity and improving the coverage in cellular systems?

13. (a)(i) Explain the generation and detection of GMSK signal.(8)
(ii) Explain the RAKE receiver.(8)

Or
(b) Explain the advantages of diversity techniques in mobile communication. Explain space diversity technique in detail.(16)

14. (a) Compare the performance of FDMA,TDMA, CDMA in detail.(16)

Or
(b) What is vocoder? Explain the linear predictive coder in detail.(16)

15. (a)(i) Explain the architecture of GSM.

(ii) What are the various channels available in GSM. Explain each channel in detail.(8)

Or

(b)(i) Compare the 2G and 3G standards of mobile communication.(8)
(ii) Explain about DECT Technology.(8)