Which three (3) of the following are advantages of an auto-transformer

More efficient for the same VA rating

Smaller in size compared to double wound transformers of the same VA rating

Improved safety due to common section of winding

Increased short-circuit performance

Which two (2) of the following are disadvantages of an auto-transformer?

No electrical isolation between the windings

Only useful for moderately smaller voltage changes

What is the safety risk if the common section of an auto-transformer winding is open circuited?

The secondary voltage could become equal to the primary voltage

Primary voltage will increase to load value

Primary current may equal secondary current

The secondary current might reach short circuit values

Which four (4) of the following are recommended precautions for the connection and disconnection of potential (instrument) transformers?

The primary and the circuit under test must be connected in parallel

The load on the secondary should be within the capacity of the transformer rating

The PT should be tested and inspected to ensure compliance with specifications before use

The secondary side of the potential transformer must never be short-circuited

The primary and secondary must be electrically interconnected to ensure mutual induction

Which three (3) of the following are typical applications of an auto-transformer?

Compensate for volt-drops in long cable runs

Reducing starting voltages of synchronous and induction motors

Dropping voltages in d.c. circuits

Increasing currents for spot welders

Which two (2) of the following are affected by the percentage impedance (Z%) value of a transformer?

Prospective short-circuit current

Which three (3) of the following are reasons for connecting transformers in parallel

in case of fire we still got power for the WIFI

What is the effect of the circulating currents that result if two transformers are incorrectly paralleled?

Set the windings on fire/overheat

Increase the output current supplied to the load

Transformers

9th - 12th Grade

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40 Qs

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9th - 12th Grade

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Practice Problem

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Hard

Matt G

Used 13+ times

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40 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Name this Autobot

Ratchet

Optimus Prime

Megatron

bumble Bee

MULTIPLE SELECT QUESTION

45 sec • 1 pt

Which two (2) of the following methods are used to insulate LV (dry) transformers

Cellulose insulation with mineral oil

Vacuum pressure Impregnated (VPI)

Cast resin (CRT)

Mineral oil only

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

An isolating transformer installed in accordance with AS/NZS 3000 must have

one leg of the primary winding connected to the secondary winding

both legs of the primary winding connected to the secondary winding

the primary winding separated from the secondary winding by double insulation

an earthed metal shield installed between windings and bonded to both windings

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

According to AS/NZS 3000, where a transformer secondary winding supplies equipment via a cable that has a current rating equal to or greater than the transformer secondary winding:

a HRC fuse must be used to protect the cable

circuit protection is not required for the cable

a circuit-breaker must be used to protect the cable

either a circuit-breaker or a fuse must be used to protect the cable

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What type of winding arrangements is used in this transformer construction

side by side

Concentric

Sandwich

LT-HT-LT-HT

MULTIPLE SELECT QUESTION

45 sec • 1 pt

Which two (2) of the following methods are used to insulate LV (dry) transformers

Cellulose insulation with mineral oil

Vacuum pressure Impregnated (VPI)

Cast resin (CRT)

Mineral oil only

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following insulation methods is the most preferred to insulate HV (wet) transformers?

Vacuum pressure impregnated (VPI)

Cast resin (CRT)

Mineral oil only

Cellulose insulation with mineral oil

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Transformers

40 questions

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Which two (2) of the following methods are used to insulate LV (dry) transformers

An isolating transformer installed in accordance with AS/NZS 3000 must have

According to AS/NZS 3000, where a transformer secondary winding supplies equipment via a cable that has a current rating equal to or greater than the transformer secondary winding:

What type of winding arrangements is used in this transformer construction

Which two (2) of the following methods are used to insulate LV (dry) transformers

Which of the following insulation methods is the most preferred to insulate HV (wet) transformers?

What is the cooling type used on this transformer

Who is the leader of the Decepticons?

Which Autobot is known for his expertise in military tactics, bravery, and being Optimus Prime's loyal second-in-command?

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