QUALITY AUDITS AND REVIEWS*

Question 1

What is the importance of a “Master Plan”?

Answer 1

• It indicates all activities to be carried out in a particular project
• It gives relation between activities not in Isolation but in relation.

-Quick overview of your current status.

Question 2

How would you set up a “Master Plan”?

Answer 2

All discipline involved together and schedule

Question 3

What is the difference between a Circuit Breaker and a Contactor?

Answer 3

Contactor is not capable of operating on faults, requires eg. fuses

Question 4

What is the reason to use standards e.g. IEC standards?

Answer 4

• Not re-invent the wheel, use other people experience.
• Allows us to speak same language, use wisdom of other to promote efficiency and safety
• Make manufacture make equipment’s.(They )

Question 5

Can you explain the importance of transformers in electrical networks?

Answer 5

• Change the voltage of electricity flowing in the circuit

- Important for economic and technical/safety reasons

Question 6

What does the vector-group of a transformer mean? Name a vector-group?

Answer 6

The angle of voltage is changed from primary to secondary

Question 7

What design codes do you normally use for are classification?

Answer 7

IP – (Institute of Petroleum) Zones due to release timing of flammable materials

Question 8

Can you explain the importance of battery systems?

Answer 8

• Batteries store energy for a reasonably long well time

- Secondary batteries is rechargeable

Question 9

What type of batteries do you know?

Answer 9

• -Secondary batteries which are rechargeable
• Vented Ni-Cd batteries
• Non-vented Lead Acid batteries
• Vented Lead Acid batteries

Question 10

How are batteries rated?

Answer 10

Ah (Amps an hour) = Charge carried in 1 amp per hour

Question 11

What voltage levels (Vdc) are normally used when applying battery sets?

Answer 11

1.2V
Total Voltage below
400V Ac
240CAc 
110V dc

Question 12

How does a UPS work?

Answer 12

This provides emergency power when the mains fails

It ensures very clean power voltage level fluctuation is 10% and frequency is 2 %

Two types of a UPS

AC UPS – rectifier from ac to dc, and inverter from dc to ac so that the output is stable

DC UPS – rectifier from ac to dc battery