Operation and Maintenance of Electrical Equipment diploma important questions

Operation and Maintenance of Electrical Equipment diploma important questions

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Unit 1 –  Earthing arrangements, Safe working on Electrical Equipment, Building Electrical Installations. 

Two and three marks

1. What is Equipment earthing?
2. Name the points to be inspected in building electrical installation.
3. Name the types of fire extinguishers
4. State the uses of ELCB.
5. Name any two points to be earthed.
6. Name the methods of earthing.
7. How to measure the earth resistance? How to reduce the earthing resistance?
8. What are the points to be checked in switches and fuses?
9. What action will take if fire occurs in electrical equipments? What action to be taken, if an electrical equipment catches fire?

Ten Marks

1. What are the two types of ELCB? Explain both types with a neat diagram.
2. Explain the points to be checked in switched and fuses.
3. Explain any two types of fire extinguishers.
4. Briefly explain the special shut down precaution in substation and power house.
5. Explain the procedure for testing the insulation resistance measurement of the internal wiring.
6. Explain the Shutdown procedure and precautions in substations and power house.
7. Briefly explain shutdown procedure.

Unit 2 Operation and Maintenance of Transformer

10 Marks

1. Write about daily, monthly and annual mainteneance taken on power transformer
2. Explain the procedure of drying out of power transformer
3. What are attentions required on bushing and insulator?
4. What maintenance work is required for transformers and at what intervals?
5. What action to be taken if the transformer oil temperature raise unduly?
6. What are the points to be checked if the oil level lends to fall down?
7. Explain the essential precautions for paralleling two transformers.
8. What are the points to be checked if the oil level tends to fall down.
9. What maintenance work is required for transformer and at intervals?

Unit 3 – Operation and Maintenance of Generators, Substations and Circuit Breaker

1. What are the causes of over heating of armature and field winding of alternator?
2. What are the causes for circulating current between alternators in parallel?
3. Explain the produce to ensure proper operation of circuit breaker in the event of fault
4. What is an AVR? State its function. Why it is provided?
5. Why automatic voltage regulator is necessary in alternator? Explain any two types of AVR.
6. Explain the maintenance of oil circuit breaker and SF6 Circuit breaker.
7. Explain the maintenance attention required for the contacts of contactors.

Unit – 4, Operation and Maintenance of AC Motors and Starters

1. Explain the function of thermal overload release and low volt release. what action to be taken if overload mechanism trips frequently?
2. Explain the significance of balancing of rotor. How balancing is achieved?
3. Briefly explain the steps to be taken, if a motor is unduly hot.
4. What are the causes of low insulation, resistance of electrical equipment and how will you rectify?
5. What are the steps to be taken if the motor is unduly hot?
6. What are the Causes of low insulation resistance of electrical equipment? How will you rectify?
7. Briefly explain the selection of starter for low/high starting torque application.

Unit – 5, Operation and Maintenance of Lighting, Transmission and Distribution

1. Write the basic steps in designing lighting installation
2. How to identify cable fault location? Explain any two methods.
3. What are the precautions required for erecting UG Cables?
4. What are the causes of failure of UG Cable?
5. What are the precautions in erecting lighting installations?
6. What are the precautions in erecting under ground cables? How to locate fault in UG cables?
7. What are the causes for lowering of illumination level?
8. What action to be taken to prevent rusting of steel posts and structures?

Two and three marks will be updated shortly

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