Transformers MCQ - Electrician (Set-1) with Answers

Transformers MCQ - Electrician (Set-1) with Answers

16) Eddy-current loss in a transformer can be reduced by :

Answer is:

decreasing the thickness of the laminations

17) The main property of a transformer is this that it changes the voltage level of an a.c. signal :

Answer is:

without changing its power, frequency and shape

18) Transformers are rated in :

Answer is:

kVA

Explanation:

The copper and iron are the two type of losses occur in the transformer. The copper loss depends on the current (ampere) flows through the windings of the transformer while the iron loss depends on the voltage (volts). i.e., the rating of the transformer is in kVA.

19) What type of core is used in a transformer designed to work at high frequencies (MHz range) ?

Answer is:

Air core

20) If the secondary turns of a transformer are doubled and at the same time the primary voltage is reduced to half then the secondary voltage will :

Answer is:

16) Eddy-current loss in a transformer can be reduced by :

decreasing the thickness of the laminations

17) The main property of a transformer is this that it changes the voltage level of an a.c. signal :

without changing its power, frequency and shape

18) Transformers are rated in :

kVA

19) What type of core is used in a transformer designed to work at high frequencies (MHz range) ?

Air core

20) If the secondary turns of a transformer are doubled and at the same time the primary voltage is reduced to half then the secondary voltage will :

not change