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    2018 Winter Question Paper (Msbte Study Resources)

    Uploaded by

    Abhishek Chavan
    This document contains instructions for a 3 hour, 100 mark exam on motor drives. It is divided into 6 sections with multiple choice and long answer questions. Some key points: 1) The exam covers topics like electric motors as prime movers, adjustable speed drives, microcontroller functions in speed control, and single-phase dual converter drives. 2) Questions assess understanding of 3-phase full wave converter drives using DC shunt motors, four quadrant drive operations, and chopper drives using power MOSFETs. 3) Additional topics examined are mechanical vs electrical braking, drive selection criteria, full converter vs semi-converter drives, and drives used in textile and paper mills. 4

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    2018 Winter Question Paper (Msbte Study Resources)

    Uploaded by

    Abhishek Chavan
    27 views4 pages
    This document contains instructions for a 3 hour, 100 mark exam on motor drives. It is divided into 6 sections with multiple choice and long answer questions. Some key points: 1) The exam covers topics like electric motors as prime movers, adjustable speed drives, microcontroller functions in speed control, and single-phase dual converter drives. 2) Questions assess understanding of 3-phase full wave converter drives using DC shunt motors, four quadrant drive operations, and chopper drives using power MOSFETs. 3) Additional topics examined are mechanical vs electrical braking, drive selection criteria, full converter vs semi-converter drives, and drives used in textile and paper mills. 4

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    17667-2018-Winter-question-paper[Msbte-study-resources]

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    This document contains instructions for a 3 hour, 100 mark exam on motor drives. It is divided into 6 sections with multiple choice and long answer questions. Some key points: 1) The exam covers topics like electric motors as prime movers, adjustable speed drives, microcontroller functions in speed control, and single-phase dual converter drives. 2) Questions assess understanding of 3-phase full wave converter drives using DC shunt motors, four quadrant drive operations, and chopper drives using power MOSFETs. 3) Additional topics examined are mechanical vs electrical braking, drive selection criteria, full converter vs semi-converter drives, and drives used in textile and paper mills. 4

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    27 views4 pages

    2018 Winter Question Paper (Msbte Study Resources)

    Uploaded by

    Abhishek Chavan
    This document contains instructions for a 3 hour, 100 mark exam on motor drives. It is divided into 6 sections with multiple choice and long answer questions. Some key points: 1) The exam covers topics like electric motors as prime movers, adjustable speed drives, microcontroller functions in speed control, and single-phase dual converter drives. 2) Questions assess understanding of 3-phase full wave converter drives using DC shunt motors, four quadrant drive operations, and chopper drives using power MOSFETs. 3) Additional topics examined are mechanical vs electrical braking, drive selection criteria, full converter vs semi-converter drives, and drives used in textile and paper mills. 4

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 4

    11819

    17667
    3 Hours / 100 Marks Seat No.

    Instructions : (1) All Questions are compulsory.


    (2) Illustrate your answers with neat sketches wherever necessary.
    (3) Figures to the right indicate full marks.
    (4) Assume suitable data, if necessary.
    (5) Mobile Phone, Pager and any other Electronic Communication devices
    are not permissible in Examination Hall.

    Marks
    1. (A) Attempt any THREE : 12
    (a) State advantages of electric motor as prime mover.
    (b) State the need of adjustable speed drives.
    (c) Enlist any eight functions of microcontroller in speed control of Drives.
    (d) Explain with neat diagram Single-phase Dual converter drive.
    (B) Attempt any ONE of the following : 6
    (a) Explain with neat circuit diagram 3 full wave converter drive using DC
    shunt motor and also explain the need of free wheeling diode.
    (b) Explain four quadrant operation of a drive with neat diagram.

    2. Attempt any FOUR of the following : 16


    (a) Draw and explain DC chopper using power MOSFET.
    (b) A single phase full controlled bridge rectifier fed from 230 V, 50 Hz supply.
    Find average armature voltage for  = 60 & 120.
    (c) Compare between mechanical braking and electrical braking with four valid
    points.
    (d) State any four the selection criterias of drives for a particular application.
    (e) Compare full converter drive and semi-converter drive on the basis of
    (i) Quadrant operation (ii) Regenerative braking (iii) Motor heating (iv) power
    flow
    (f) State sequence of stages & drives used for them in Textile mills.
    [1 of 4] P.T.O.
    17667 [2 of 4]
    3. Attempt any FOUR of the following : 16
    (a) Compare DC shunt motor & DC series motor with Torque-Speed
    characteristics and application.
    (b) Classify different types of chopper motor drives on the basis of Quadrant
    Operation.
    (c) State the drives used in paper mill.
    (d) State requirements of drives used for machine tool applications. Which type
    of motor is suitable for these applications ?
    (e) Explain operation of microprocessor based speed control drive with block
    diagram.
    (f) Compare AC drives with DC drives. (any four points)

    4. (A) Attempt any THREE of the following : 12


    (a) Draw schematic diagram of speed control of stepper motor using micro-
    controller.
    (b) List various methods of controlling speed of induction motor drives.
    (c) List four advantages of converter fed induction motor.
    (d) State any four advantages of microcontroller based drives.
    (B) Attempt any ONE : 6
    (a) State requirements of drives used in steel rolling mill. Which motor is
    used ?
    (b) Explain rotor-resistance control of induction motor using chopper for
    speed control of induction motor.

    5. Attempt any FOUR : 16


    (a) Explain single phase semi-convertor drive for speed control of separately
    excited DC motor.
    (b) Write the sequence of stages and drives used in each stage for Sugar mill.
    (c) Explain stator voltage control method of induction motor with block diagram.
    (d) Draw the block diagram and explain the working of phase locked loop control
    of DC motor drive.
    (e) Draw the circuit diagram of three phase dual-convertor drive and explain its
    operation.
    (f) List any four advantages of induction motor drives over DC motor drives.
    17667 [3 of 4]
    6. Attempt any FOUR : 16
    (a) Draw neat block diagram of micro-computer based control of DC motor drive.
    (b) Identify type of chopper used for large current applications. Justify with neat
    diagram & waveforms.
    (c) Draw schematic arrangement of closed loop control by using PWM inverter
    for induction motor.
    (d) Compare the following speed control method of induction motor, stator
    voltage control and V/F control.
    (e) Describe working of two quadrant chopper drive with neat diagram.
    (f) Which drives are used in Elevators & Why ? Justify your answer.
    _______________

    P.T.O.
    17667 [4 of 4]

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