Transformers MCQ - Electrician (Set-1) with Answers

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

Answer is:

Insufficient clamping of laminated core

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 ?

Answer is:

Core

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

Answer is:

Silicon steel

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

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 :

Answer is:

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

Insufficient clamping of laminated core

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

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

Silicon steel

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

Auto transformer

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 :

toroidal type