TRANSFORMER - Practice Mode

1) What is the condition for obtaining maximum efficiency from transformer?

Copper loss > Iron loss Copper loss < Iron loss Copper loss = Iron loss Copper loss =Eddy current loss

Correct Answer: Copper loss = Iron loss

2) What is the function of top float switch of buchholz relay in transformer?

Activate in moisture presence Activate at overloading condition Activate at open circuit condition Activate at high temperature condition

Correct Answer: Activate at overloading condition

3) Why the core of current transformer is having low reactance and low core losses?

To minimise the burden To maintain constant output To prevent high static shield To minimise the error in reading

Correct Answer: To minimise the error in reading

4) How the error in reading of a potential transformer can be reduced? |

Using thin laminated core Providing long magnetic path Using high flux density material Providing good quality core material

Correct Answer: Providing good quality core material

5) Why the load is disconnected before the OFF load tap changing operation?

To disconnect the tappings from neutral point To disconnect the moving contact of the diverter To avoid heavy sparking at the contact points To provide an electrical isolation for the windings

Correct Answer: To avoid heavy sparking at the contact points

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