Exam Details
| Subject | commissioning of electrical equipments | |
| Paper | ||
| Exam / Course | pddc | |
| Department | ||
| Organization | Gujarat Technological University | |
| Position | ||
| Exam Date | November, 2018 | |
| City, State | gujarat, ahmedabad |
Question Paper
1
Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC SEMESTER-VIII EXAMINATION WINTER 2018
Subject Code:X80901 Date: 29/11/2018
Subject Name: Commissioning of Electrical Equipments
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1
What is the commissioning of electrical equipment? Explain the classification of different testing.
07
What is need of drying out test? What are the different methods for drying out of transformer? Explain.
07
Q.2
Explain the following test regarding transformer
Polarity test Loss measurement Power frequency with stand test.
07
Explain the procedure of purification and filtration for transformer oil.
07
OR
What is the significance of polarity in case of current transformer? How can we test the polarity of C.T?
07
Q.3
Give causes, consequences and remedies for the following abnormal conditions of 3-phase induction motor.
1. Overheating 2. Stalling 3. Excessive speed.
07
Explain different methods to measure the slip of induction motor.
07
OR
Q.3
Explain procedure for conducting Full load test on 3-phase induction motor. Also analyze characteristics of diff. parameters with curves.
07
Explain different types of maintenance of 3 phase induction motor.
07
Q.4
Explain the commissioning steps and test for D.C. machine.
07
What are the different methods for drying out of D.C. machine? Explain any two methods in detail.
07
OR
Q.4
For the following conditions explain in detail troubles, causes and its remedies
for synchronous motor:
Motor fails to start.
Motor starts but fail to come up to full speed.
Motor fails to synchronize.
07
Explain following test regarding cable
High voltage test.
Insulation resistance test.
Conductor resistance test.
07
Q.5
Explain open circuit and short circuit tests on a synchronous motor.
07
Explain Field test for D.C. machine.
07
OR
Q.5
How to measure the earth resistance? Explain the experiment method.
07
What are the different methods for find out cable faults? Explain Verlly loop test.
07
Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC SEMESTER-VIII EXAMINATION WINTER 2018
Subject Code:X80901 Date: 29/11/2018
Subject Name: Commissioning of Electrical Equipments
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1
What is the commissioning of electrical equipment? Explain the classification of different testing.
07
What is need of drying out test? What are the different methods for drying out of transformer? Explain.
07
Q.2
Explain the following test regarding transformer
Polarity test Loss measurement Power frequency with stand test.
07
Explain the procedure of purification and filtration for transformer oil.
07
OR
What is the significance of polarity in case of current transformer? How can we test the polarity of C.T?
07
Q.3
Give causes, consequences and remedies for the following abnormal conditions of 3-phase induction motor.
1. Overheating 2. Stalling 3. Excessive speed.
07
Explain different methods to measure the slip of induction motor.
07
OR
Q.3
Explain procedure for conducting Full load test on 3-phase induction motor. Also analyze characteristics of diff. parameters with curves.
07
Explain different types of maintenance of 3 phase induction motor.
07
Q.4
Explain the commissioning steps and test for D.C. machine.
07
What are the different methods for drying out of D.C. machine? Explain any two methods in detail.
07
OR
Q.4
For the following conditions explain in detail troubles, causes and its remedies
for synchronous motor:
Motor fails to start.
Motor starts but fail to come up to full speed.
Motor fails to synchronize.
07
Explain following test regarding cable
High voltage test.
Insulation resistance test.
Conductor resistance test.
07
Q.5
Explain open circuit and short circuit tests on a synchronous motor.
07
Explain Field test for D.C. machine.
07
OR
Q.5
How to measure the earth resistance? Explain the experiment method.
07
What are the different methods for find out cable faults? Explain Verlly loop test.
07
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