46) What is the cause for producing humming noise in the transformer core ?

Overload of the transformer

Low rated voltage

Insufficient clamping of laminated core

Misalignment of stamping

Answer is:

Insufficient clamping of laminated core

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Related Transformers MCQ - Electrician (Set-1) with Answers

47) No load loss of a transformer has two components. They are eddy current and hysteresis loss. In which part of a transformer hysteresis loss will occur ?

Core

Breather

Transformer oil

Conservator

Answer is:

Core

48) Which material is used for the construction of the power transformer core ?

Mild steel

High carbon steel

Silicon steel

Stainless steel

Answer is:

Silicon steel

49) Which type of transformer does not isolate the secondary ?

Potential transformer

Auto transformer

Distribution transformer

Current transformer

Answer is:

Auto transformer

Explanation:

The auto transformer with common winding can not be used as isolation transformer because it has a connection between primary and secondary side. Isolation transformer provides available supplying even if the device is broken.

50) Voltage stabilizers are having auto transformer with tappings or stepless variation depending upon the type of stabilizer. Auto transformer in servo stabilizer is of :

core type

shell type

toroidal type

distributed core type

Answer is:

toroidal type

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