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    2021-22

    Uploaded by

    KESHAV RAINA
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    You are on page 1of 2

    Printed Page: 1 of 2

    Subject Code: KEE061


    0Roll No: 0 0 0 0 0 0 0 0 0 0 0 0 0

    BTECH
    (SEM VI) THEORY EXAMINATION 2021-22
    SPECIAL ELECTRICAL MACHINES

    Time: 3 Hours Total Marks: 100


    Note: Attempt all Sections. If you require any missing data, then choose suitably.

    SECTION A
    1. Attempt all questions in brief. 2*10 = 20
    Qno Questions CO
    (a) How stepper motors are different from conventional motors. 1
    (b) Give the advantage of having low rotor inertia of two phase ac 1
    servomotor.
    (c) What is stepper motor? State its type. 2
    (d) Define step angle. 2
    (e) Give the classification of switched reluctance motors. 3
    (f) State any four applications of switched reluctance motors 3
    (g) What are the types of permanent magnet DC motor 4
    (h) Write any four applications of PCB motors. 4
    (i) Write any four applications of hysteresis motors. 5
    (j) Write any four applications of reluctance motors. 5
    29

    98
    _0

    9.
    SECTION B
    P1

    24
    2. Attempt any three of the following: 10*3 = 30
    Qno Questions CO

    1.
    2E

    (a) Explain with the help of suitable example and sketches for the 1
    .2
    P2

    followings
    25
    (i) Constant torque control of Induction Machine
    Q

    |1

    (ii) Constant power control of Induction Machine


    (b) Explain the construction and principle of operation of hybrid stepper 2
    34

    motor.
    2:

    (c) Explain the principal of operation and operating modes of switched 3


    :3

    reluctance motor. Also writes its advantage and disadvantage.


    13

    (d) Explain the principal of operation and torque production of three-phase 4


    2

    three-pulse brushless dc motor. Also mention its advantage over


    02

    conventional dc motor.
    -2

    (e) Write short note on 5


    (i) Hysteresis motor
    06

    (ii) Single phase reluctance motor


    5-
    |1

    SECTION C
    3. Attempt any one part of the following: 10*1 = 10
    Qno Questions CO
    (a) Write short note on two phase servomotor discussing the construction, 1
    torque-speed characteristics and applications.
    (b) Write short note on the followings- 1
    (i) Characteristics of SEIG in detail.
    (ii) Characteristics of DFIG in detail

    QP22EP1_029 | 15-06-2022 13:32:34 | 125.21.249.98


    Printed Page: 2 of 2
    Subject Code: KEE061
    0Roll No: 0 0 0 0 0 0 0 0 0 0 0 0 0

    BTECH
    (SEM VI) THEORY EXAMINATION 2021-22
    SPECIAL ELECTRICAL MACHINES

    4. Attempt any one part of the following: 10 *1 = 10


    Qno Questions CO
    (a) Write short note on permanent magnet stepper motor discussing its 2
    construction, operation and application.
    (b) Discuss in details the principle of operation and characteristics of 2
    hybrid stepper motor with applications.

    5. Attempt any one part of the following: 10*1 = 10


    Qno Questions CO
    (a) Discuss various drive circuits of switched reluctance motors 3
    (b) Explain in details the constructional features of Linear SRM. Also 3
    discuss the principle of operation, Torque production and performance
    characteristics.

    6. Attempt any one part of the following: 10*1 = 10


    Qno Questions CO
    (a) Write short note on permanent magnet synchronous generators and 4
    29
    their applications.

    98
    (b) Write short note on the followings- 4
    _0

    9.
    (a) Sinusoidal PM ac motors.
    P1

    24
    (b) Brushless DC motors.

    1.
    2E

    7. Attempt any one part of the following: 10*1 = 10


    .2
    P2

    Qno Questions CO
    25
    (a) A universal series motor when operating on 220 V dc, draws 10 Amp 5
    Q

    |1

    and runs at 1440 r.p.m. Find the new speed and p.f. when connected to
    220 V 25 Hz ac supply, the motor current remaining the same. The
    34

    motor has total resistance of 1 Ω and total inductance of 0.1H.


    2:

    (b) An ac operated universal motor has a 2-pole armature with 960 5


    :3

    conductors. At a certain load the motor speed is 5000 rpm and the
    13

    armature current is 4.6 Amp; the armature terminal voltage and input
    are respectively 100 V and 300 W. Calculate the following quantities
    2

    assuming an armature resistance of 3.5 Ohm.


    02

    (i) Effective armature reactance


    -2

    (ii) Maximum value of useful flux/pole.


    06
    5-
    |1

    QP22EP1_029 | 15-06-2022 13:32:34 | 125.21.249.98

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