Exam Details
| Subject | electrical machines & electronics | |
| Paper | ||
| Exam / Course | pddc | |
| Department | ||
| Organization | Gujarat Technological University | |
| Position | ||
| Exam Date | May, 2017 | |
| City, State | gujarat, ahmedabad |
Question Paper
1
Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC- SEMESTER-II EXAMINATION SUMMER 2017017
Subject Code: X21901 Date:30/05/2017
Subject Name: ELECTRICAL MACHINES ELECTRONICS
Time: 10:30 AM to 01:00 PM Total Marks: 70
Instructions:
1. Attempt any five questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1
Explain construction features and working principle of DC generator.
07
Explain construction and working principle of 3-phase induction motor.
07
Q.2
Explain the types of DC motors with diagram.
07
Why 1-phase induction motor is not self start? How it make self start?
07
Q.3
Explain construction and working principle of 1-phase transformer.
07
What are the methods to control speed of DC motors. Explain in details.
07
Q.4
What are the conditions for parallel operation of alternators? Explain synchronizing of alternators.
07
Explain comparison of A.C. and D.C. transmission.
07
Q.5
What is tariff? Explain types of tariff.
07
What is a power factor? Discuss the methods to improve power factor.
07
Q.6
What is substation? Explain classification of substation.
07
Explain half wave and full wave rectifier circuit with diagram.
07
Q.7
Explain De-Morgan's theorems.
07
Explain the architecture of 8085 microprocessor.
07
Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC- SEMESTER-II EXAMINATION SUMMER 2017017
Subject Code: X21901 Date:30/05/2017
Subject Name: ELECTRICAL MACHINES ELECTRONICS
Time: 10:30 AM to 01:00 PM Total Marks: 70
Instructions:
1. Attempt any five questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1
Explain construction features and working principle of DC generator.
07
Explain construction and working principle of 3-phase induction motor.
07
Q.2
Explain the types of DC motors with diagram.
07
Why 1-phase induction motor is not self start? How it make self start?
07
Q.3
Explain construction and working principle of 1-phase transformer.
07
What are the methods to control speed of DC motors. Explain in details.
07
Q.4
What are the conditions for parallel operation of alternators? Explain synchronizing of alternators.
07
Explain comparison of A.C. and D.C. transmission.
07
Q.5
What is tariff? Explain types of tariff.
07
What is a power factor? Discuss the methods to improve power factor.
07
Q.6
What is substation? Explain classification of substation.
07
Explain half wave and full wave rectifier circuit with diagram.
07
Q.7
Explain De-Morgan's theorems.
07
Explain the architecture of 8085 microprocessor.
07
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