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Transformers
| 1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
| 2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
| Q1 ⇒ The nominal short-circuit voltage of the
transformer is defined as percentage of the rated primary voltage [other wrong options] [Discuss in forum] |
| Q2 ⇒ Buchholz's relay gives warning and
protection against electrical fault inside the transformer itself [other wrong options] [Discuss in forum] |
| Q3 ⇒ The purpose of a breather in a transformer
is to extract moisture from the air [other wrong options] [Discuss in forum] |
| Q4 ⇒ In a transformer an insulating material
may fail due to any of the above [other wrong options] [Discuss in forum] |
| Q5 ⇒ The value of useful flux least depends
on load [other wrong options] [Discuss in forum] |
| Q6 ⇒ A step-up transformer increases voltage [other wrong options] [Discuss in forum] |
| Q7 ⇒ The secondary winding of a current
transformer whose primary is carrying
current should not be open-circuited [other wrong options] [Discuss in forum] |
| Q8 ⇒ While rising and falling if a wave is not
symmetrical, it contains even harmonics in addition to fundamental [other wrong options] [Discuss in forum] |
| Q9 ⇒ In measuring voltage or current by
means of instrument transformer only ratio errors need be considered [other wrong options] [Discuss in forum] |
| Q10 ⇒ Star-star power transforrae-r is protected
by curren't transformer having delta/delta connections [other wrong options] [Discuss in forum] |
| Q11 ⇒ The dielectric strength of transformer
oil is expected to be 33 kV [other wrong options] [Discuss in forum] |
| Q12 ⇒ A transformer transforms power [other wrong options] [Discuss in forum] |
| Q13 ⇒ In the transformer the function of a
conservator is to protect the transformer from damage when oil expends due to heating [other wrong options] [Discuss in forum] |
| Q14 ⇒ The power transformer is a constant main flux device [other wrong options] [Discuss in forum] |
| Q15 ⇒ An ideal transformer has infinite values
of primary and secondary inductances.
The statement is FALSE [other wrong options] [Discuss in forum] |
| Q16 ⇒ A transformer oil must be free from moisture [other wrong options] [Discuss in forum] |
| Q17 ⇒ The magnetising current of a transformer
is usually small because it has small air gap [other wrong options] [Discuss in forum] |
| Q18 ⇒ Harmonics in transformer result in all of the above [other wrong options] [Discuss in forum] |
| Q19 ⇒ Two transformers are connected in
parallel. These transformers do not
have equal percentage impedance. This
is likely to result in loading of the transformers not in proportion to their kVA ratings [other wrong options] [Discuss in forum] |
| Q20 ⇒ When secondary of a current transformer
is open-circuited its iron core
will be hot because of heavy iron losses taking place in it due to high flux density [other wrong options] [Discuss in forum] |
| Or |