DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING MICROPROCESSORS AND MICROCONTROLLERS

Transcription

1 DADI INSTITUTE OF ENGINEERING & TECHNOLOGY (Approved by A.I.C.T.E., New Delhi & Affiliated to JNTUK, Kakinada) NAAC Accredited Institute An ISO 9001:2008, ISO 14001:2004 & OHSAS 18001:2007 Certified Institute. NH-5, Anakapalle , Visakhapatnam, A.P. Phone: / / , examcell@diet.edu.in DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING MICROPROCESSORS AND MICROCONTROLLERS III /II EEE : (Question Bank) : R Name of the Faculty: Mr. B.N. Srinivasa Rao UNIT-1 1. a) Discuss about the memory segmentation in 8086 processor. [5] b) What is the function of Flag register? Describe about the each flag bit [5] 2 a) List basic features of microprocessor. [5] b) What is instruction pipelining? [5] 3. a) Explain 8086 architecture with neat diagram and also explain register organization. [5] b). Explain the segmented memory organization structure of 8086 and also discuss the advantages. [5] 4. a) Describe about the physical memory organization in an 8086 system (or) Discuss about the memory segmentation in 8086 processor. [5] b) List basic features of microprocessor and discuss. [5] 5. a) Discuss the features of microprocessor. [5] b) Specify the size of data, address, memory word and memory capacity of 8086 Microprocessor [5] UNIT-II 1. a) Explain the minimum mode operation of 8086 with the help of a PIN diagram [5] b) Write an assemble language program for finding the Largest number in an Array, the length of array is ten 16-bit numbers. [5] 2. a) Explain any three string manipulation instructions of [5] b) Write an assemble language program to find the sum of the squares of first ten numbers. [5] 3. a) Discuss briefly about the addressing modes of 8086 with examples. [5]

2 b) Draw the timing diagram for the memory read cycle operation in the minimum mode of 8086 processor [5] 4. a) Define assembler and explain the different assembler directives used in 8086 microprocessor [5] b) Write a program with a flowchart to multiply two 8-bit numbers. [5] 5. a) Write an ALP to find the multiplication of two 16-bit Hex numbers? [5] b) Describe the function of the following pins in8086 maximum mode of operation i) TEST ii) RQ0 /GT 0 and RQ1//GT1 1 [5] UNIT-III 1. a) Draw block diagram of 8255 and explain its modes of operation. [5] b) Show the control word format of 8255 and explain how each bit is programmed. [5] 2. a) Draw and Explain the cascaded mode operation of 8259 with a neat block diagram. [5] b) Discuss about the operational command words of 8259 and draw its frame format. [5] 3. With a neat diagram, explain the working of 8257 DMA controller. [5] 4. a) Interfacing of a two 4X4 PROM and two 8X4 RAM with 8086 CPU, draw the memory map and interfacing diagram for it, the RAM address follows the ROM address.. [5] b) Name any two types of A to D converters. Explain any one. [5] 5. a) What are the registers available in 8257? What are their functions. [5] b) Discuss about the initialization command words of 8259 and their sequence in detail.[5] UNIT-IV 1. a) Discuss about the addressing modes of 8051 micro controller [5] b) Explain the arithmetic and logic instruction of 8051 microcontroller with example. [5] 2. a) Explain the internal RAM organization of [5] b) What is the use of SFR? Discuss the structure of the following registers and explain. [5] a) PSW b) IE c) SCON d) TMOD e) PCON f) IP. 3. a) Explain the architecture of 8051 with its diagram. [5] b) Explain the data types and assembler directives of [5] 4. a) Explain the organization of memory in 8051 microcontroller b) Explain the structure of Program Status Word register of [5] 5. a) Explain the modes of operation of Timer unit in 8051 Microcontroller. [5]

3 b) Write a program based on 8051 instruction set to pack array of unpacked BCD digits.[5] UNIT-V 1. Write short notes on following a) List out the salient futures of PIC controller. [5] b) List out the salient features of PIC Flash controller. [5] 2. a) List out the interrupts of PIC controller. [5] b) Draw and Explain different timers presented in PIC controller. [5] 3. a) Draw the internal architecture of PIC controller and explain its operation. [5] b) Draw the flag register of PIC controller and explain the function of each flag in detail. [5] 4. Explain the Power on reset and watch dog timers operation in PIC controller in detail. [5] 5. a) Explain different I/O ports presented in PIC controller and draw the necessary diagram for it. [5] b) List different PIC micro controller families. [5] UNIT-VI 1. a) Explain the structure of C program [5] b) Explain the components of C program with examples [5] 2. a) What are the data types in and explain [5] b) Explain the functions in C [5] 3. a) List and explain various operators in C [5] b) List and explain various control statements in C [5] 4. a) Explain about pointers in C [5] b) Write a C program to add two numbers [5] 5. a) Write a C program to access a port to read and write the data [5] b) Write a C program to blink an LED [5]

4 DADI INSTITUTE OF ENGINEERING & TECHNOLOGY (Approved by A.I.C.T.E., New Delhi & Affiliated to JNTUK, Kakinada) NAAC ACCREDITED INSTITUTE An ISO 9001:2008, ISO 14001:2004 & OHSAS 18001:2007 Certified Institute. NH-5, Anakapalle , Visakhapatnam, A.P. Phone: / / , info@diet.edu.in Course :B.Tech. Branch : EEE Year/Semester : III/II Academic Year : Faculty Name : T.Sujatha Subject :Data Structures Through C++ Admitted Batch : 2016 QUESTION BANK UNIT I 1. a) Explain Class, Data Abstraction and Encapsulation in C++. 5 M b) Explain about Abstract Data Type and Inheritance in C++. 5 M 2. a) Explain the procedure of Declaring Class Objects in C++. 5 M b) Explain how to invoke Member Functions with example. 5 M 3. a) Explain about Polynomial and its Representation. 5 M b) Write a C++ function to Add two Polynomials. 5 M 4. a) Explain about Sparse Matrix and its Representation. 5 M b) Explain briefly about Special Class Operations. 5 M 5. a) Write a C++ function to Multiply the given Two Matrices. 5 M b) Write a C++ function to display the Transpose of a given Matrix. 5 M UNIT II 1. a) Explain about Stack ADT, PUSH and POP Operations. 5 M b) Write C++ functions to implement PUSH and POP Stack Operations. 5 M 2. a) Explain about Queue ADT, INSERT and DELETE Operations. 5 M b) Write C++ functions to implement INSERT and DELETE Queue Operations. 5 M 3. a) Explain about Circular Queues Operations. 5 M b) Explain representation of Infix, Prefix and Postfix notations. 5 M 4. a) Explain about Inheritance in C++ with example. 5 M b) Convert the Infix Expression (a+b)*c/d+(e+f) into Postfix using Stacks. 5 M 5. a) Evaluate the Postfix Expression: / + * 2 3 / + 5 M b) Explain about Template Functions and Template Classes in C++ with examples. 5 M

5 DADI INSTITUTE OF ENGINEERING & TECHNOLOGY (Approved by A.I.C.T.E., New Delhi & Affiliated to JNTUK, Kakinada) NAAC ACCREDITED INSTITUTE An ISO 9001:2008, ISO 14001:2004 & OHSAS 18001:2007 Certified Institute. NH-5, Anakapalle , Visakhapatnam, A.P. Phone: / / , info@diet.edu.in UNIT III 1. a) What is a Single Linked List? Explain its representation. 3 M b) Write a C++ Program to Create and Display the given Single Linked List. 7 M 2. a) Explain Stack operations using Linked Lists. 3 M b) Write a C++ Program to implement Stack Operations using SLL. 7 M 3. a) Explain Queue operations using Linked Lists. 3 M b) Write a C++ Program to implement Queue Operations using SLL. 7 M 4. a) What is a Double Linked List? Explain its representation. 3 M b) Write a C++ Program to Create and Display the given Double Linked List. 7 M 5. a) Explain different cases of Insert operations on a single linked list. 3 M b) Write C++ functions to Insert a New Node at First Place, Last Place and at any given position in a Single Linked List. 7 M UNIT IV 1. a) Construct the binary tree from the following: Pre-order: 1, 2, 4, 8, 9, 10, 11, 5, 3, 6, 7 In-order: 8, 4, 10, 9, 11, 2, 5, 1, 6, 3, 7 b) What is a binary tree? Construct a binary tree from the following: Pre-Order Traversal: G B Q A C K F P D E R H In-Order Traversal: Q B K C F A G P E D H R 5 M 5 M 2. a) Find In order, Pre order and Post order traversals of the given binary tree: 5 M F B G A D I C E H b) Discuss about different binary tree traversals with examples. 5 M 3. a) Write short notes on Threaded Binary trees. 5 M b) Explain various methods in which a Binary Tree can be represented. Discuss their advantages and disadvantages. 5 M

6 DADI INSTITUTE OF ENGINEERING & TECHNOLOGY (Approved by A.I.C.T.E., New Delhi & Affiliated to JNTUK, Kakinada) NAAC ACCREDITED INSTITUTE An ISO 9001:2008, ISO 14001:2004 & OHSAS 18001:2007 Certified Institute. NH-5, Anakapalle , Visakhapatnam, A.P. Phone: / / , info@diet.edu.in 4. a) With the help of diagrams construct a Binary Search Tree (BST) with the following keys: 23,12,45,36,5,15,39,2,19. Also delete 42 from BST. 5 M b) Write a C++ Program to Create and Display a Binary Search Tree. 5 M 5. a) Write a C++ Program to Create and Display a Binary Tree. 5 M b) Draw a Max Heap Tree with the following values: 20,12,14,3,52,15,139,27,190 5 M UNIT V 1. a) What are different ways of representing a graph? Explain with example. 5 M b) Explain Prim s algorithm with the following Graph: 5 M 2. a) Write a C++ Program to Traverse the given Graph using Depth First Search. 5 M b) Explain DFS. Print DFS Order and DFS Tree for the following Graph: 5 M 3. a) Write a C++ Program to Traverse the given Graph using Breadth First Search. 5 M b) Explain BFS. Print BFS Order and BFS Tree for the following Graph: 5 M 4. a) Explain Kruskal s Algorithm to find the Minimum Cost Spanning Tree. 5 M b) Find Minimum Cost of the following Graph using Kruskal s Algorithm: 5 M

7 DADI INSTITUTE OF ENGINEERING & TECHNOLOGY (Approved by A.I.C.T.E., New Delhi & Affiliated to JNTUK, Kakinada) NAAC ACCREDITED INSTITUTE An ISO 9001:2008, ISO 14001:2004 & OHSAS 18001:2007 Certified Institute. NH-5, Anakapalle , Visakhapatnam, A.P. Phone: / / , info@diet.edu.in 5. a) Explain Sollin s Algorithm to find the Minimum Cost Spanning Tree. 5 M b) Find Minimum Cost of the following Graph using Sollin s Algorithm: 5 M UNIT VI 1. a) Explain and Write an algorithm for Merge Sort. 5 M b) Sort the elements using Merge Sort: 12,25,5,9,1,84,63,7,15,4,3 5 M 2. a) Explain and Write an algorithm for Quick Sort. 5 M b) Sort the elements using Quick Sort: 66,5,45,36,65,15,39,66,56,55 5 M 3. a) Explain and Write an algorithm for Insertion Sort. 5 M b) Sort the elements using Insertion Sort: 65,6,54,63,56,61,14,39,28,16,30 5 M 4. a) Explain Heap Sort Technique. 5 M b) Write a C++ Program to Sort the given vales using Heap Sort/Tree. 5 M 5. a) Write a C++ Program to Sort the given values using Quick Sort. 5 M b) Write a C++ Program to Sort the given values using Insertion Sort. 5 M Signature of Faculty

8 DADI INSTITUTE OF ENGINEERING & TECHNOLOGY (Approved by A.I.C.T.E., New Delhi & Affiliated to JNTUK, Kakinada) NAAC Accredited Institute An ISO 9001:2008, ISO 14001:2004 & OHSAS 18001:2007 Certified Institute. NH-5, Anakapalle , Visakhapatnam, A.P. Phone: / / , examcell@diet.edu.in QUESTION BANK BRANCH:EEE SUB: Power System Analysis Name of the Faculty: M.Rajarao YEAR/SEM/COURSE: III/II B.TECH UNIT 1 1. a) Obtain the per unit representation for the three-phase power system shown in figure 1 Figure Generator 1 : 50 MVA; 10.5 KV; X = 1.8 ohm Generator 2 : 25 MVA; 6.6 KV; X = 1.2 ohm Generator 3 : 35 MVA; 6.6 KV; X = 0.6 ohm Transformer T1 : 30 MVA; 11/66 KV; X = 15 ohm/phase Transformer T2 : 25 MVA; 66/6.2 KV, as h.v. side X = 12 ohms Transmission line: XL = 20 ohm/phase 2. a) Draw p.u impedance diagram of the network shown in figure. b) Why do you use a single line diagram for power system representation? What are the assumptions that are being made while drawing a single line diagram? 3. a) What is per unit system? How is the base quantities selected? b) Draw the per unit impedance diagram for the power system shown in figure below.

9 a) Form Ybus for the network by direct inspection method: b)

10 6. 7. a) Write down the steps necessary to convert system parameters into per unit values. b)obtain Ybus by direct inspection method for the following network; assume the values are in p.u. admittances. 1. UNIT 2

11 2. 3. A) Derive the basic equations for the load flow study using Gauss-Seidel method. With respect to this method, explain the following: i) Acceleration factor. ii) Handling of PV buses. B) What is Jacobian matrix? How the elements of Jacobian matrix are computed? 4. In fig shows the one-line diagram of a simple three-bus power system with generation at bus 1isV 1.0 0o 1 = Ð per unit. The scheduled loads on buses 2 and 3 are marked on the diagram. Line impedances are marked in per unit on a 100 MVA base. For the purpose of hand calculations, line resistances and line charging susceptance re neglected. Using gauss-seidel method and initial estimates of V 2 =1.0 + j0andv 3 =1.0 + j0, determine V2 and V3. Perform two iterations. 5. a) List the quantities specified and quantities to be determined from the load flow study for the various types of buses b) Write an algorithm for GS method when consider all types of buses c) Develop the static load flow equations for load flow studies 1. UNIT 3

12 Give the expressions for building Zbus for a power systems 1) Addition of a branch 2) Addition of a link 5. a) Compute the bus impedance matrix for the system shown in figure below by adding element by element. Take bus (2) as reference bus.

13 b) Give the applications of the ZBus building algorithm UNIT 4 1. The short circuit MVA at the bus bars for a power plant A is 1200 MVA and for another plant B is 1000 MVA at 33 KV. If these two are to be interconnected by a tie-line with reactance 1.2 ohm. Determine the possible short circuit MVA at both the plants. b) What are the harmful effects of short circuit faults on the power system? 2. a) There are two generating stations each which an estimated short circuit KVA of 500,000 KVA and 600,000 KVA. Power is generated at 11 KV. If these two stations are interconnected through a reactor with a reactance of 0.4 ohm, what will be the short circuit KVA at each station? b) What do you understand by short-circuit KVA? Explain. 3. The following figure shows a generating station feeding a 132 kv system. Determine the total fault current fault level and fault current supplied by each alternator for a 3- phase fault at the receiving end bus. The line is 250 km long. 4. Figure shows a system having 4 alternators each rated at 11 kv, 50 MVA and each having a subtransient reactance of 15%. Find a) fault level for a fault on one of the feeders( near the bus) with zero value of reactance X (b) the reactance of the current limiting reactor X to limit the fault level to 800 MVA for a fault on one of the feeder( near the bus).

14 5. The system shown in Fig below shows an existing plant consisting of a generator of 100 MVA, 30 KV, with 20 percent sub transient reactance and a generator of 50 MVA, 30 KV with 15 percent reactance, connected in parallel to a 30-KV bus bar. The 30-KV bus bar feeds a transmission line via the circuit breaker C which is related at 1250 MVA. A grid supply is connected to the substation bus bar through a 500 MVA, 400/30KV transformer with 20 percent reactance. Determine the reactance of a current limiting reactor in ohm to be connected between the grid system and the existing bus bar such that the short circuit MVA of the breaker C does not exceed. UNIT 5 1. a) What are the various types of faults? Discuss their frequency of occurrence and severity? Find the fault current when an L-L-G fault occurs at the terminals of an unloaded generator. b) Derive an expression for the positive sequence current Ia1 of an unloaded generator when it is subjected to a double line to ground fault. 2. a) What are symmetrical components? Explain the symmetrical component transformation. b) What is meant by sequence impedance? Explain the sequence network of an unloaded generator. 3. a) Prove that a line to ground fault at the terminals for an alternator with solidly grounded neutral is more severe than a three phase fault. b) Explain the zero sequence networks of transformers with diagrams. 4. Two 11kV, 20 MVA, 3f, star connected generators operates in parallel. The positive, negative and zero sequence reactance of each being respectively, j 0.18, j 0.15, j0.1p.u. The star point of one the generator is isolated and that of the other is earthed through a 2_ resistor. A

15 single line to ground fault occurs at the terminals of one of the generator. Determine i) fault current ii) current in ground resistor and iii) voltage across grounding resistor. 5. a) Distinguish between symmetrical and unsymmetrical faults. b) A 20 MVA, 11kV generator solidly grounded neutral has a subtransient reactance of 0.25 P.u. The negative and zero sequence reactances are j0.14, j 0.07 respectively. A SLG fault occurs at the terminals of an unloaded generator. Determine the fault current and line to line voltages. UNIT 6 1. a) Derive the swing equation for a single machine connected to infinite bus system. State the assumptions if any and state the usefulness of this equation. Neglect the damping. b) Discuss the various factors affecting the transient stability of the system. 2. a) Explain the equal area criterion for the stability of an alternator supplying infinite bus via an inductor interconnector. b) Discuss the various methods for improving steady state stability. 3. a) Explain critical clearing time and critical clearing angle, deriving the expressions. b) Describe the methods of improving transient stability. 4. Draw a diagram to illustrate the application of equal area criterion to study Transient stability when there is a sudden increase in the input of generator. 5. (a) Derive an expression for the critical clearing angle for a power system consisting of a single machine supplying to an infinite bus, for a sudden load increment. (b) A 4 Pole, 50Hz, 11kV generator is rated 75 MW and 0.86 P.f lag the machine rotor has a moment of inertia of 9000kg.m2. Ffind the inertia constant in MJ/MVA and M constant or momentum in M-J sec/elec degree

16 DADI INSTITUTE OF ENGINEERING & TECHNOLOGY (Approved by A.I.C.T.E., New Delhi & Affiliated to JNTUK, Kakinada) NAAC Accredited Institute An ISO 9001:2008, ISO 14001:2004 & OHSAS 18001:2007 Certified Institute. NH-5, Anakapalle , Visakhapatnam, A.P. Phone: / / , examcell@diet.edu.in DEPARTMENT OF ELECTRICAL & ELECTRONICS ENGINEERING QUESTION BANK( ) POWER ELECTRONIC CONTROLLERS & DRIVES Name of the faculty : M Rajendra Prasad REGULATION: R16 COURSE : B.TECH BRANCH: EEE YEAR / SEMESTER : III/ II UNIT I 1 a) Explain the different components of basic electrical drive system. [5M] b) Describe different braking methods employed for electrical motors. [5M] 2 a) What are the main factors which decide the choice of electrical drive for a given application? [5M] b) Explain in detail about components of load torques. [5M] 3 a) Explain the four quadrant operation of a motor drive in general. [5M] b) Describe different braking methods employed for D.C. motors. [5M] 4 a) What are advantages of electrical drive? [5M] b) Explain about fundamental torque equation. [5M] 5 a) What do you mean by regenerative braking of motor? Explain. [5M] b) Explain about nature and classification of different load torques. [5M] 6 a) Explain the different components of basic electrical drive system. [5M] b) Explain the four quadrant operation of a motor drive in general. [5M] UNIT 2 1 a) Describe the flux control method of series motor. [5M] b) Explain the first quadrant chopper controlled separately excited dc motor. [5M]

17 2 a) Explain the operation of a separately excited dc motor supplied from 3-phase fully controlled rectifier with necessary diagrams. Assume Continuous conduction.[5m] b) A 220V, 1440rpm, 120A separately excited DC motor with armature resistance of 0.7 ohms is fed from 3- phase fully controlled converter with an ac source line voltage 440V, 50 Hz supply. A star connected transformer is used to feed the armature so that motor terminal voltage equals rated voltage when converter firing angle is zero. Calculate the value of firing angle when motor is running at 1200 rpm at rated torque.[5m] 3 a) Briefly explain different speed control techniques for D.C. motor. [5M] b) Discuss the drawbacks of rectifier control of dc series motor. [5M] 4 a) Explain the operation of 3-phase six pulse converter feeding DC series motor with neat diagram and relevant waveforms. [5M] b) A 200V, 875rpm, 150A separately excited dc motor has an armature resistance of 0.06ohm. It is fed from a three phase fully controlled rectifier with an ac source of220v, 50Hz. Assuming continuous conduction, calculate (i) Firing angle for rated motor torque and 750rpm. (ii) Motor speed for a =1600 and rated torque. [5M] 5 a) Explain the operation of dual converter controlling the separately excited dc motor. [5M] b) A 220 V, 1500 rpm, 11.6 A separately excited motor is controlled by a 3-phase fully controlled rectifier with an ac source voltage of 230 V, 50 Hz. Enough filter inductance is added to ensure continuous conduction for any torque greater than 25 percent of rated torque, Ra = 2 ohms. (i) What should be the value of the firing angle to get the rated torque at 1000 rpm? (ii) Ca1culate the firing angle for the rated braking torque and 1500 rpm. (iii) Ca1culate the motor speed at the rated torque and alpha = 160 degrees for the regenerative braking in the second quadrant. 6 a) Explain the operation of a separately excited dc motor supplied from 3-phase semi controlled rectifier.[5m] b) A 12.2 kw, 230 V, 850 rpm, 56 A dc separately exited motor is controlled by a 3-phase fully-controlled rectifier fed from 460 V, 60 Hz ac supply through transformer. It has an armature resistance of ohms and sufficient inductance to assure continuous conduction for all operating points with torques greater than 20 percent of the rated. The transformer and the source impedance can be neglected. (i) A rated dc voltage across the motor at full load is desired. Choose a suitable transformer from the following three available: (a) 460/460 V (b) 460/230 V (c) 460/ 180 V Having chosen the transformer find the following: (i) The rectifier firing angle for the rated torque and speed. [5M] (ii) The rectifier firing angle for the rated braking torque and the speed of 600 rpm in the reverse direction. [5M]

18 UNIT- 3 1a) Explain the first quadrant chopper controlled separately excited dc motor. [5M] b) Describe the first quadrant chopper control of dc series motor. [5M] 2 a) Explain the operation of a four quadrant chopper fed to the D.C series motor and also draw the current and voltage wave forms for continuous current operation.[5m] b) A 220v, 24A, 1000rpm separately excited dc motor having an armature resistance of 2 ohms is controlled by a chopper. The chopping frequency is 500Hz and the input voltage is 230V. Calculate the duty ratio for a motor torque of 1.2 times rated torque at 500rpm. [5M] 3 a) Explain with circuit and waveforms of four quadrant chopper fed separately excited DC motor.[5m] b) A 230V, 960rpm and 200A separately excited dc motor has an armature resistance of 0.02ohms. The motor is fed from a chopper, which is capable of providing both motoring and braking operations. The source has a voltage of 230V. Assuming continuous conduction: When motor is operated in Dynamic braking, with Braking resistance of 2 ohm (i) calculate Duty ratio of chopper for a motor speed of 600 rpm and braking torque of twice the rated value. (ii) What will be the motor speed for a duty ratio of 0.6 and motor torque equal to twice its rated value? [5M] 4a) List the advantages offered by dc chopper drives over line-commutated converter controlled dc drives. [5M] b) Draw the block diagram of closed loop operation of chopper controlled dc motor. [5M] 5 a) Explain with circuit and waveforms of two quadrant chopper fed separately excited DC motor.[5m] b) A 230V, 960 rpm and 200A separately excited dc motor has Ra=0.02ohm. The motor is fed from a chopper which provides both motoring and braking operations. Assume continuous conduction. Calculate duty ratio of chopper for motoring and braking operations at rated torque and 350 rpm[5m] 6 a) With circuit and waveforms explain the operation of four quadrant chopper fed separately excited DC motor.[5m] b) A 230 V, 500 rpm, 90 A separately excited dc motor having an armature resistance and inductance ohms and 11 mh respectively, is controlled by a c1ass C twoquadran chopper operating with a source voltage of 230 V and a frequency of 400 Hz. (i) Calculate the motor speed for a motoring operation at delta = 0.5 and half of rated torque. (ii) What will be the motor speed when regenerating at delta = 0.5 and rated torque? [5M] UNIT- 4

19 1a) Draw the block diagram of closed loop operation of induction motor drives. [5M] b) Why V/f ratio must be constant for a frequency controlled induction motor drive?explain. [5M] 2 a) Discuss speed control of induction motor from stator side with speed-torque curves. [5M] b) The parameters of a three phase 400 Volts, 50 Hz, 6 pole, 960 rpm, and star connected induction motor has the following parameters per phase referred to the stator. R1= 0.4 Ohm. R2 = 0.20 Ohm,X1 = X2 =1.5 Ohm, Xm = 30 Ohms. If the motor is controlled by variable frequency control at a constant flux of rated value, determine the motor speed and the stator current at half the rated torque and 25Hz. [5M] 3 a) Explain why stator voltage control is suitable for speed control of Induction motors in fan and pump drives. Draw and explain speed control of 3 phase Induction motor using AC Voltage Controller b) The rotor resistance and stand still reactance referred to stator of a 3 phase, 4 pole, 50 Hz Squirrel cage Induction motor is 0.2 ohm and 0.8 ohm per phase respectively. The full load slip of the motor is 4 percent. Neglect stator resistance and leakage reactance. Determine how much stator voltage should be reduced in order to get a speed of 1200 rpm if the load torque remains constant. [5M] 4 a) Draw the speed-torque characteristics of induction motor with variable frequency control. [5M] b) Explain the significance of (V/f) speed control method of an induction motor. [5M] 5 a) Show that variable frequency control of induction motor is more efficient than stator voltage control. b) A 440V, 3 phase, 50 Hz, 6 pole, 945 rpm, delta connected Induction Motor has the following parameters referred to the stator. Rs = 2ohms, Rr = 2ohms, Xs = 3ohms, Xr = 4ohms. When driving a fan load at rated voltage it runs at rated speed. The motor speed is controlled by stator voltage control.determine motor terminal voltage, current and torque at 800 RPM. [5M] 6 a) Explain speed control of induction motor by AC Voltage Controllers. [5M] b) A 3 phase, 4 pole, 50 Hz squirrel cage Induction motor has the following circuit parameters: r1 = 0.05ohm, r2 = 0.09ohm, X1 + X2 = 0.55ohm The motor is star connected and rated voltage is 400V. It drives a load whose torque is proportional to the speed and is given as Tl = 0.05w N-m. Determine the speed and torque of the motor for a firing angle of 45 degree of the AC Voltage Controller on a 400V, 50 Hz supply[5m] UNIT 5 1a) Define Slip power and its significance. [5M] b) Draw and explain the equivalent circuit of a wound rotor induction motor when voltage is injected in the rotor circuit. [5M] 2 a) Draw the circuit diagram and explain the operation of rotor- resistance control of Induction motor. Mention the advantages and disadvantages of the above method of control.[5m]

20 b) Explain Static Kramer drive for a three phase induction motor.[5m] 3a) Why rotor resistance control is preferred in low power crane drives? [5M] b) Draw the circuit diagram for static Scherbius drive [5M] 4 a) Explain static Scherbius drive control for speed control of induction motor. Draw speed -torque characteristics. [5M] b) Explain with circuit & waveforms for speed control of induction motor by Static rotor resistance. 5 a) Draw the circuit diagram and explain the working of a slip power recovery system using Static Kramer drive for a three phase induction motor.[5m] b) Explain with circuit and waveforms for speed control of induction motor by Static rotor resistance method.[5m] 6 a) Draw and explain the equivalent circuit of a wound rotor induction motor when voltage is injected in the rotor circuit. [5M] b) Draw the circuit diagram and explain the working of a slip power recovery system using Static Kramer drive for a three phase induction motor.[5m] UNIT 6 1a) When operating in true synchronous mode, why the frequency must be changed in small steps? [5M] b) Compare self-controlled and load-commutated inverter controlled synchronous motor drives. [5M] 2 a) Describe self-controlled and load-commutated inverter controlled synchronous motor drives in detail.[5m] b) Draw the block diagram of a closed loop synchronous motor drive fed from VSI. [5M] 3 a) Explain the operation of Load commutated CSI fed Synchronous motor drive. [5M] b) In variable frequency control of a synchronous motor why (V/f) ratio is maintained constant up to base speed and V constant above the base speed. Explain briefly with necessary waveforms. [5M] 4 a) What is the basic difference between true synchronous mode and self control mode for variable frequency control of Synchronous motor? [5M] b) Compare self-controlled and load-commutated inverter controlled synchronous motor drives. 5 a) Describe the operation of self-controlled Synchronous Motor drives in detail. [5M] b) Describe the open-loop and closed loop methods of speed control of a synchronous motor using VSI. [5M] 6 a) How is the output voltage of a VSI improved by PWM techniques? Explain how you will use this Converter for speed control of a synchronous motor. [5M]

21 b) Discuss in detail with suitable circuit diagram the principle of operation of self controlled Synchronous motor drive employing load commutated thyristor inverter. [5M]

22 DADI INSTITUTE OF ENGINEERING & TECHNOLOGY (Approved by A.I.C.T.E., New Delhi& Affiliated to JNTUK, Kakinada) NAAC Accredited Institute An ISO 9001:2008, 14001:2004 & OHSAS 18001:2007 Certified Institute NH 5, Anakapalle, Visakhapatnam , Andhra Pradesh Phone: /221122/ , E Mail: info@diet.edu.in, Web: DEPARTMENT OF COMPUTER SCIENCE & ENGINEERING QUESTION BANK ( AY) Subject: Unix and Shell Programming Faculty: Mrs. G Sujatha Branch/Sem: III EEE / II Regulation : R16 UNIT I 1. a) What are the features of Unix operating system? (5 M) b) Explain the following basic UNIX commands? (a) ls (b) cat (c) cal (5 M) 2. a) Explain the UNIX architecture (5 M) b) Explain the following unix commands (5 M) i) cp ii) rm iii) mv 3. Explain the networking commands in unix (10 M) 4. (a) Explain about how to create a directory in UNIX? (5 M) (b) Explain about how to remove a directory in UNIX? (5 M) 5. a) Explain the Command Substitution with examples? (5 M) b) Multiple Commands in Unix? (5 M) Unit II 1. a) Explain about the file system in UNIX (5 M) b) Discuss about the Basics of Files in UNIX (5 M) 2. a) Explain the file permissions in UNIX (5 M) b) Discuss about the Directory Hierarchy? (5 M) 3. a) Explain the file attributes and permissions in UNIX (5 M) b) The file command in UNIX, explain? (5 M) 4. Briefly explain about how to change the file permissions using chmod command (10 M) 5. a) Explain about how to change the ownership of a file (5 M) b) Explain about how to change the group of a file (5 M)

23 Unit III 1.a) Explain the shell command line structure (5 M) b) Discuss about Meta Characters in Unix (5 M) 2.a) How to create new shell commands (5 M) b) Explain command arguments and parameters (5 M) 3.a) How to set program output as arguments (5 M) b) Briefly explain about shell variables (5 M) 4.Explain the I/O Redirection with examples? (10 M) 5. a) Explain about for loop with example? (5 M) b) Describe about while loop with example? (5 M) Unit IV 1. a) Explain about the following filters (i) cut (ii) paste (iii) uniq. (5 M) b) Explain about the following filters (i) head (ii) tail (iii) sort (5 M) 2. Briefly explain about grep family with suitable examples (10 M) 3. a) Explain the features of stream editor sed (5 M) b) Explain the structure of sed (5 M) 4. a) Explain the concept of awk? Write about fields and records (5 M) b) Draw the standard awk script design? How can we use commands in awk script file? (5 M) 5. a) What are the good files in UNIX, explain? (5 M) b) What are the good filters UNIX, explain? (5 M)

24 Unit V 1) a) Briefly explain about shell variables (5 M) b) Explain the export command (5 M) 2) a) Explain about the read command in shell programming (5 M) b) Positional Parameters in UNIX (5 M) 3) a) Explain the exit status of command (5 M) b) Explain about the set command (5 M) 4) a) Discuss about branching control structures (5 M) b) Discuss about loop control structures (5 M) 5) a) Explain about the following: (5 M) (i) expr command (ii) the here document b) Explain about the following: (5 M) (i) script (ii) eval (iii) exec Unit VI 1.a) What is a process, explain? (5 M) b) Briefly discuss about the parent and child processes (5 M) 2. a) Explain various types of processes (5 M) b) Briefly explain about foreground and background processes (5 M) 3 a)explain about internal and external commands (5 M) b) Explain how to create a process (5 M) 4) Explain the following commands with suitable examples : (10 M) (i) trap (ii) stty 5) a) Explain about the kill command (5 M) b) Discuss about job control (5 M)