The purpose of the pressure relief valve in a transformer is:

To release excess pressure and protect the transformer

Which of the following best defines induction, turns ratio, polarity, losses, and impedance in the context of transformers?

They are key electrical properties and characteristics that determine transformer operation and performance.

They are types of transformer windings.

They are transformer cooling methods.

They are transformer core materials.

Explain how to locate the nameplate of a transformer.

To locate the nameplate of a transformer, look for a metal plate attached to the body of the transformer, usually on the tank or the main frame, which contains important identification and rating information.

Check inside the transformer core for a paper label with the nameplate information.

The nameplate is always found on the power supply cable connected to the transformer.

The nameplate is painted directly onto the transformer cooling fins.

By the end of this session, you should be able to: Identify and interpret the nameplate information of a transformer.

Nameplate information typically includes the transformer's voltage rating, current rating, frequency, phase, manufacturer, serial number, and other key specifications. Interpreting this information helps in understanding the transformer's capabilities and limitations.

Nameplate information only includes the color and shape of the transformer, which are important for aesthetic purposes.

Nameplate information is mainly about the installation date and the location of the transformer, which are not related to its operation.

Nameplate information provides details about the transformer’s packaging and shipping instructions, not its electrical characteristics.

By the end of this session, you should be able to: Explain when to refer to the nameplate of a transformer.

You should refer to the nameplate of a transformer whenever you need to verify its specifications, perform maintenance, troubleshooting, or ensure compatibility with the electrical system.

Only when the transformer is being installed for the first time.

Only if the transformer is making unusual noises.

Only when the transformer is being replaced with a new one.

Where can you find the kVA rating, and why is it important?

The kVA rating is found on the transformer and is important because it has to do with the available wattage.

The kVA rating is found in the circuit breaker and is important for voltage regulation.

The kVA rating is found on the light bulb and is important for color temperature.

The kVA rating is found in the wiring and is important for insulation type.

What can happen internally to a transformer if the insulating fluids do not operate properly?

It can be devastating to the transformer.

It will increase the efficiency of the transformer.

It will make the transformer lighter.

It will improve the cooling of the transformer.

What is an overhead transformer?

An overhead transformer is a transformer that is mounted on poles above ground level to distribute electrical power.

An overhead transformer is a device used to measure wind speed above buildings.

An overhead transformer is a type of generator installed underground.

An overhead transformer is a transformer that is only used in underwater power distribution.

What is an underground transformer?

An underground transformer is a transformer installed below ground level, typically in a vault, to distribute electrical power.

An underground transformer is a device used to measure soil moisture content.

An underground transformer is a machine that extracts minerals from underground mines.

An underground transformer is a type of underground water pump used in irrigation systems.

What does transformer rating refer to?

Transformer rating refers to the maximum amount of electrical power a transformer can handle safely.

Transformer rating refers to the voltage drop across the transformer windings.

Transformer rating refers to the physical size of the transformer core.

Transformer rating refers to the efficiency of the transformer at full load.

Name two types of transformers.

Overhead transformers and underground transformers.

Step-up transformers and step-down transformers.

Current transformers and potential transformers.

Dry-type transformers and oil-immersed transformers.

What is the core of a transformer?

The core of a transformer is the part that provides a path for the magnetic flux.

The core of a transformer is the part that stores electrical energy.

The core of a transformer is the part that generates heat.

The core of a transformer is the part that controls the output voltage.

What are the windings in a transformer?

The windings in a transformer are coils of wire that carry the electrical current.

The windings in a transformer are cooling fans used to reduce heat.

The windings in a transformer are metal plates that store energy.

The windings in a transformer are switches that control the voltage.

What is the function of insulating fluid in a transformer?

The insulating fluid in a transformer insulates and cools the internal components.

It increases the voltage output of the transformer.

It acts as a conductor to transfer electricity between windings.

It reduces the weight of the transformer.

What is a pressure relief valve in a transformer used for?

A pressure relief valve in a transformer is used to release excess pressure to prevent damage.

It is used to increase the voltage of the transformer.

It is used to cool down the transformer oil.

It is used to measure the current in the transformer.

The importance of Identification and Anatomy in transformers is:

To ensure proper functioning and maintenance

To increase the weight of transformers

To make transformers more expensive

What is induction in the context of transformers?

Induction in transformers refers to the process by which a changing magnetic field in the core induces a voltage in the secondary winding.

Induction in transformers refers to the process of increasing the current in the primary winding.

Induction in transformers refers to the conversion of electrical energy to mechanical energy.

Induction in transformers refers to the process of reducing resistance in the core.

What does the term 'turns ratio' mean in transformers?

Turns ratio is the ratio of the number of windings in the primary coil to the number of windings in the secondary coil of a transformer.

Turns ratio is the ratio of the voltage in the primary coil to the current in the secondary coil of a transformer.

Turns ratio is the ratio of the resistance in the primary coil to the resistance in the secondary coil of a transformer.

Turns ratio is the ratio of the power in the primary coil to the power in the secondary coil of a transformer.

Explain the concept of polarity in transformers.

Polarity in transformers refers to the direction of the induced voltage in the windings relative to each other.

Polarity in transformers refers to the physical size of the transformer core.

Polarity in transformers refers to the color coding of transformer terminals.

Polarity in transformers refers to the efficiency rating of the transformer.

What are losses in transformers?

Losses in transformers are the energy losses that occur due to resistance in the windings and core, such as copper loss and core loss.

Losses in transformers are the increase in voltage due to magnetic flux.

Losses in transformers are the energy gained from external sources.

Losses in transformers are the reduction in transformer size due to cooling.

What is impedance in a transformer?

Impedance in a transformer is the total opposition to the flow of alternating current, consisting of resistance and reactance.

Impedance in a transformer is the measure of its efficiency in converting AC to DC.

Impedance in a transformer is the amount of voltage drop across the primary winding only.

Impedance in a transformer is the magnetic flux produced in the core.

What information is typically found on transformer nameplates?

Transformer nameplates typically include information such as voltage rating, current rating, frequency, phase, and manufacturer details.

Transformer nameplates only display the color of the transformer and its installation date.

Transformer nameplates list the names of the engineers who installed the transformer.

Transformer nameplates provide only the weight and height of the transformer.

What is the purpose of a transformer nameplate?

The purpose of a transformer nameplate is to provide essential information about the transformer's specifications and operating limits.

To display the manufacturer's logo only.

To provide instructions for transformer installation.

To indicate the color of the transformer.

What can happen if the information on a transformer nameplate is ignored?

If the information on a transformer nameplate is ignored, it can lead to improper operation, equipment damage, or safety hazards.

Nothing will happen; the transformer will work as usual.

The transformer will automatically adjust to any condition.

Ignoring the nameplate information will improve transformer efficiency.

What is the primary function of a transformer?

To change voltage from one level to another

Transformers - Learning Outcomes

Authored by Shane Byrd

Specialty

Professional Development

Used 1+ times

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A pole-mounted transformer is installed on utility poles, while a pad-mounted transformer is installed on the ground. Identify which is which.

Pole-mounted transformer is on utility poles; pad-mounted transformer is on the ground.

Pole-mounted transformer is on the ground; pad-mounted transformer is on utility poles.

Both are installed on the ground.

Both are installed on utility poles.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Identify the primary and secondary bushings of a transformer.

The bushings connected to the high voltage and low voltage windings respectively

The bushings connected to the core and the tank

The bushings used for cooling the transformer

The bushings used for earthing only

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The kVA rating of a transformer can be found on:

the nameplate

the winding

the core

the oil tank

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The difference between a conventional and CSP (Completely Self-Protected) transformer is:

CSP transformers have built-in protection devices, while conventional transformers do not.

Conventional transformers are more compact than CSP transformers.

CSP transformers require external protection devices, while conventional transformers do not.

There is no difference between conventional and CSP transformers.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The core of a transformer is made of:

Copper

Aluminium

Silicon steel laminations

Plastic

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The function of the windings in a transformer is to:

Transfer electrical energy between circuits through electromagnetic induction.

Increase the resistance in the circuit.

Store electrical energy as chemical energy.

Convert AC to DC.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The purpose of insulating fluids in a transformer is:

To provide electrical insulation and dissipate heat

To increase the voltage

To reduce the size of the transformer

To improve the efficiency of the core

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Transformers - Learning Outcomes

A pole-mounted transformer is installed on utility poles, while a pad-mounted transformer is installed on the ground. Identify which is which.

Identify the primary and secondary bushings of a transformer.

The kVA rating of a transformer can be found on:

The difference between a conventional and CSP (Completely Self-Protected) transformer is:

The core of a transformer is made of:

The function of the windings in a transformer is to:

The purpose of insulating fluids in a transformer is:

The purpose of the pressure relief valve in a transformer is:

Which of the following best defines induction, turns ratio, polarity, losses, and impedance in the context of transformers?

The turns ratio of a transformer is calculated by dividing the number of primary windings by the number of secondary windings. What is the turns ratio if the primary has 200 windings and the secondary has 50 windings?

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