Looking for 9A02601 - Power Semiconductor Drives old question paper 2013 ? Given here under is the contents of 9A02601 - Power Semiconductor Drives from JNTUA. Download it now.
Code: 9A02601
B. Tech III Year II Semester (R09) Regular & Supplementary Examinations, April/May 2013
POWER SEMICONDUCTOR DRIVES
(Electrical & Electronics Engineering)
Time: 3 hours Max. Marks: 70
Answer any FIVE questions
All questions carry equal marks
*****
1 (a) Explain the operation of single phase fully controlled rectifier fed d.c. series motor with relevant diagrams.
(b) A series motor is supplied from a full converter whose α = 650, 1- supply of 230 V rms, 50 HZ frequency. The armature and field resistance together equal 2 Ω. The torque constant is 0.23 H and the load torque is 20 Nm. Neglect damping and find the average armature current and speed.
2 Explain the speed - torque characteristics of a separately excited dc motor connected to a three phase semi controlled converter.
3 (a) Explain the principle of operation of a dual converter in circulating current mode. How the same is used for speed control of dc drive?
(b) Discuss in detail counter current and dynamic braking operations of D.C shunt motors.
4 (a) Draw and explain in detail of motoring and regenerative braking operation of chopper control
of separately excited DC motor.
(b) A 220 V, 24 A, 1000 rpm separately excited dc motor having an armature resistance of 2 Ω is controlled by a chopper. The chopping frequency is 500 Hz and the input voltage is 230 V. Calculate the duty ratio for a motor torque of 1.2 times rated torque at 500 rpm.
5 (a) Using a 3-phase solid state AC voltage controller explain clearly how it is possible to achieve
4-quadrant operation of 3-phase induction motor.
(b) Draw a closed loop speed control scheme of an induction motor with AC voltage controller.
6 Compare VSI and CSI fed induction motor drives.
7 (a) What is the range of firing angle of thyristors in line communicated inverter fed static
scherbius drive. Describe in detail.
(b) In a static Kramer drive system of an induction motor how speeds can be controlled from synchronous speed to stand still.
8 Explain the variable frequency control of synchronous motor in detail.
JNTUA
Jawaharlal Nehru Technlogical University , Anantapur
B.Tech Regular & Supplementary Examination , April/May 2013
Third Year
Second Semester
Department Of Electrical and Electronics Engineering
9A02601 - Power Semiconductor Drives
(Regulation 2009)
Code: 9A02601
B. Tech III Year II Semester (R09) Regular & Supplementary Examinations, April/May 2013
POWER SEMICONDUCTOR DRIVES
(Electrical & Electronics Engineering)
Time: 3 hours Max. Marks: 70
Answer any FIVE questions
All questions carry equal marks
*****
1 (a) Explain the operation of single phase fully controlled rectifier fed d.c. series motor with relevant diagrams.
(b) A series motor is supplied from a full converter whose α = 650, 1- supply of 230 V rms, 50 HZ frequency. The armature and field resistance together equal 2 Ω. The torque constant is 0.23 H and the load torque is 20 Nm. Neglect damping and find the average armature current and speed.
2 Explain the speed - torque characteristics of a separately excited dc motor connected to a three phase semi controlled converter.
3 (a) Explain the principle of operation of a dual converter in circulating current mode. How the same is used for speed control of dc drive?
(b) Discuss in detail counter current and dynamic braking operations of D.C shunt motors.
4 (a) Draw and explain in detail of motoring and regenerative braking operation of chopper control
of separately excited DC motor.
(b) A 220 V, 24 A, 1000 rpm separately excited dc motor having an armature resistance of 2 Ω is controlled by a chopper. The chopping frequency is 500 Hz and the input voltage is 230 V. Calculate the duty ratio for a motor torque of 1.2 times rated torque at 500 rpm.
5 (a) Using a 3-phase solid state AC voltage controller explain clearly how it is possible to achieve
4-quadrant operation of 3-phase induction motor.
(b) Draw a closed loop speed control scheme of an induction motor with AC voltage controller.
6 Compare VSI and CSI fed induction motor drives.
7 (a) What is the range of firing angle of thyristors in line communicated inverter fed static
scherbius drive. Describe in detail.
(b) In a static Kramer drive system of an induction motor how speeds can be controlled from synchronous speed to stand still.
8 Explain the variable frequency control of synchronous motor in detail.
0 comments:
Pen down your valuable important comments below