EE 642 SEM Model Paper - 1 - 2021

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1
USN D A 18EE642
Sixth Semester B. E. Degree (Autonomous) Semester End Examination, SEE, 2021
SPECIAL ELECTRICAL MACHINES
(Model Question Paper – 1)

Time: 3 Hours Maximum Marks: 100
Instructions to candidates: Answer FIVE full questions as per the choice
# Question Marks COs RBT

1 a) Describe construction and principle of operation of a variable reluctance 06 M CO 1
L2
type stepper motor.
b) Explain half step, full step and micro-stepping mode of operation of a CO 1
stepper motor 06 M L2
c) A 4 phase variable reluctance stepper motor has 1.8 0 step angle at full step
mode. Calculate,
i) The resolution,
ii) The number of steps required for 50 revolutions, 08 M
CO 4 L3
iii) Shaft speed, if stepping is 5000 pulse per second,
iv) Step angle for half step mode,
v) Number of teeth on rotor.
OR
2 a) With a neat sketch explain the construction and working principle of PM CO 1
06 M L2
stepper motor.
b) List the major types of stepper motor and mention their applications 06 M
CO 2 L1
c) Sketch and Explain torque -speed characteristics of a stepper motor. Also

CO 4
explain slew range, pull in range and pull out range. 08 M L4
3 a) Enumerate the salient features of switched reluctance motor. Compare the CO 2

same with stepper motor. 04 M L1
b) Justify the necessities of rotor position sensor for the operation of witched
CO 3
reluctance motor? 04 M L5
c) Develop the torque equation and develop the mechanical characteristics of 12 M CO 4 L3

SRM.
OR
Dr. Ambedkar Institute of Technology, Bangalore – 560056

(An Autonomous Institution Affiliated to Visvesvaraya Technological University, Belgaum & Aided by Govt. of Karnataka, India)
(Page 2 of 2)
4 a) With the help of neat circuit diagram explain any two power converter CO 3
08 M L2
schemes for Switched Reluctance Motor.
b) Describe the merits and demerits of Switched Reluctance Motor. List their CO 2
applications. 04 M L2
c) Discuss with a neat block diagram the microcontroller based speed control 08 M CO 5 L2
of a Switched Reluctance Motor.
5 a) What are the types of materials used in PMDC motors? Draw the B-H CO 1
hysteresis loop of permanent magnet material. 04 M L 1,4
b) Explain the construction and working principle of PMDC motor. 08 M

CO 1 L5
c) With the help neat block diagram, explain the closed loop control scheme of CO 5
08 M L 4,5
a PMBLDC motor drive with a suitable schematic diagram.
OR
6 a) List the reasons why the PMBLDC motor is called electronically
06 M CO 3 L1
commutated motor?
b) Explain power controllers used in PMBLDC motor. 06 M CO 5 L6
c) Develop the Torque and EMF equation of square wave brushless motor. 08 M CO 4 L6
7 a) Enumerate the merits and demerits of PMSM? CO 2

06 M L1
b) With necessary phasor diagram and circle diagram, describe torque speed 08 M CO 4 L 2, 4
characteristics of PMSM.
c) Compare BLPMDC motor and PMSM. 06 M
CO 2 L4
OR
8 a) Compare PMSM with BLPMDC motor. 04 M CO 2 L4
b) Explain the microprocessor based control of PMSM 08 M CO 5 L5
c) A 3 phase 4 pole, star connected synchronous motor has 72 slots with 10 08 M
CO 4
conductors per slot, the flux per pole is 60 mWb and runs at 1000 rpm. L3
Assuming full pitched coils determine the line and phase voltages.
9 a) With a neat sketch explain the constructional features and principle of 10 M CO 1 L5

operation of Axial Flux Motor.
b) The applied frequency of LIM is 50 Hz, has a pole pitch of 10 cm. The
motor is running at a velocity of 8 m/sec determine the slip. If the motor CO 4
10 M L3
running at a slip of 10% determine its speed. At what pole pitch the winding
to be wound if the required synchronous speed is 72 km/hour.
OR
10 a) With a neat sketch explain the constructional features and principle of 10 M CO 1 L5
operation of Linear Induction motor.
b) With usual notations derive the thrust equation of LIM. CO 4
10 M L5
*******
Dr. Ambedkar Institute of Technology, Bangalore – 560056

(An Autonomous Institution Affiliated to Visvesvaraya Technological University, Belgaum & Aided by Govt. of Karnataka, India)

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(Page 1 of 2)

Sixth Semester B. E. Degree (Autonomous) Semester End Examination, SEE, 2021

SPECIAL ELECTRICAL MACHINES

(Model Question Paper – 1)

Instructions to candidates: Answer FIVE full questions as per the choice

# Question Marks COs RBT

c) Sketch and Explain torque -speed characteristics of a stepper motor. Also

3 a) Enumerate the salient features of switched reluctance motor. Compare the CO 2

c) Develop the torque equation and develop the mechanical characteristics of 12 M CO 4 L3

Dr. Ambedkar Institute of Technology, Bangalore – 560056

b) Explain the construction and working principle of PMDC motor. 08 M

7 a) Enumerate the merits and demerits of PMSM? CO 2

9 a) With a neat sketch explain the constructional features and principle of 10 M CO 1 L5

Dr. Ambedkar Institute of Technology, Bangalore – 560056

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