Transformers MCQs : This section focuses on the "Basics" of Transformers. These Multiple Choice Questions (MCQs) should be practiced to improve the Transformers skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
A _________ is a passive electrical device that transfers electrical energy from one electrical circuit to another, or multiple circuits.
A. voltage regulation
B. autotransformer
C. transformer
D. phase conversion
Question 2
Transformers are most commonly used for ?
A. increasing low AC voltages at high current
B. decreasing high AC voltages at low current
C. increasing high AC voltages at low current
D. Both A and B
Question 3
Transformers can also be used for isolation?
A. TRUE
B. FALSE
C. Can be true or false
D. Can not say
Question 4
The first constant-potential transformer invented in?
A. 1880
B. 1885
C. 1890
D. 1895
Question 5
Transformer losses arise from?
A. Winding joule losses
B. Stray losses
C. Eddy current losses
D. All of the above
Question 6
In a transformer the resistance between its primary and secondary is ______________
A. Zero
B. Very small
C. Infinite
D. Can not say
Question 7
An ideal transformer will have maximum efficiency at a load such that _____________
A. copper loss = iron loss
B. copper loss < iron loss
C. copper loss > iron loss
D. Can not say
Question 8
What is the no-load current drawn by transformer?
A. 0.2 to 0.5 per cent
B. 2 to 5 per cent
C. 12 to 15 per cent
D. 20 to 30 per cent
Question 9
A transformer oil used in an electrical transformer must be free from ________
A. Gases
B. Odour
C. Sludge
D. Moisture
Question 10
Which of the following is not an Applications of transformers?
A. transformer used for impedance matching
B. transformer used for isolate four circuits electrically
C. used to increase or decrease the alternating voltages in electric power applications
D. transformer used in voltmeter, ammeters, protective relay