TOP 100 MCQS On Electrical Transformer

Supreme Tutorials emphasizes the value of top-notch educational materials. Their TOP 100 MCQs on Electrical Transformers are carefully designed to address various topics, aiding students and professionals in exam preparation and knowledge enhancement. These MCQs provide a practical way to test and enhance understanding in transformer-related concepts.

At Supreme Tutorials, we recognize the importance of providing high-quality educational resources. Our TOP 100 MCQs on Electrical Transformer are meticulously crafted to cover a wide range of concepts, from transformer types and configurations to efficiency ratings and maintenance practices. Whether you’re a student preparing for exams or a professional seeking to deepen your knowledge, these MCQs offer a valuable opportunity to test and improve your understanding.

Electrical transformer
Electrical transformer
  1. What is the primary function of an electrical transformer?

a) Voltage regulation

b) Current regulation

c) Power generation

d) Energy storage

Which material is commonly used as the core of an electrical transformer?

a) Copper

b) Aluminum

c) Iron

d) Silver

What is the efficiency range of a typical electrical transformer?

a) 50-60%

b) 70-80%

c) 90-95%

d) 100%

What is the formula to calculate the turns ratio of a transformer?

a) Turns ratio = Primary voltage / Secondary voltage

b) Turns ratio = Secondary voltage / Primary voltage

c) Turns ratio = Primary current / Secondary current

d) Turns ratio = Secondary current / Primary current

Which type of transformer has a laminated core?

a) Step-up transformer

b) Step-down transformer

c) Auto-transformer

d) Distribution transformer

What is the purpose of the transformer oil in an electrical transformer?

a) Insulation

b) Cooling

c) Voltage regulation

d) Current control

What happens to the voltage in a step-up transformer?

a) Increases

b) Decreases

c) Remains the same

d) Depends on the load

Electrical transformer
Electrical transformer

Which of the following is not a type of transformer based on construction?

a) Shell-type transformer

b) Core-type transformer

c) Distribution transformer

d) Auto-transformer

What is the primary reason for using a transformer in electrical systems?

a) To reduce power losses

b) To increase voltage levels

c) To control current flow

d) To improve power factor

Which parameter determines the rating of a transformer?

a) Voltage

b) Current

c) Power

d) All of the above

What is the frequency typically used in power distribution transformers?

a) 50 Hz

b) 60 Hz

c) 50-60 Hz

d) Variable frequency

TOP 100 MCQS On Electrical Transformer

What is the function of the tap changer in a transformer?

a) To change the voltage ratio

b) To change the current ratio

c) To adjust the load

d) To control the power factor

Which transformer is commonly used in electrical substations?

a) Distribution transformer

b) Power transformer

c) Step-up transformer

d) Step-down transformer

What is the ideal power factor for a transformer?

a) 0.5

b) 0.8

c) 1.0

d) 1.5

TOP 100 MCQS On Electrical Transformer

Transformer
Transformer
Types of transformers
Types of transformers

What is the typical cooling method used in large power transformers?

a) Air cooling

b) Water cooling

c) Oil cooling

d) Forced cooling

What is the effect of loading a transformer beyond its rated capacity?

a) Increases efficiency

b) Reduces losses

c) Decreases lifespan

d) Improves voltage regulation

TOP 100 MCQS On Electrical Transformer

Which transformer configuration allows for multiple voltage levels?

a) Single-phase transformer

b) Three-phase transformer

c) Multi-tap transformer

d) Delta-wye transformer

Electrical transformer
Electrical transformer

What is the purpose of the conservator tank in a transformer?

a) To store oil

b) To prevent oil leakage

c) To maintain oil level

d) To cool the transformer

Which type of transformer has a variable turns ratio?

a) Step-up transformer

b) Step-down transformer

c) Auto-transformer

d) Distribution transformer

TOP 100 MCQS On Electrical Transformer

What is the maximum efficiency achieved by modern transformers?

a) 50%

b) 75%

c) 90%

d) 100%

Which transformer has a high turns ratio?

a) Step-up transformer

b) Step-down transformer

c) Auto-transformer

d) Distribution transformer

TOP 100 MCQS On Electrical Transformer

What is the function of the bushings on a transformer?

a) To provide mechanical support

b) To connect electrical cables

c) To insulate high-voltage connections

d) To control current flow

Which parameter is not considered during transformer design?

a) Voltage regulation

b) Efficiency

c) Current control

d) Power factor

What is the typical insulation material used in transformers?

a) PVC

b) Fiberglass

c) Mineral oil

d) Silicon rubber

Which type of transformer has a continuous winding?

a) Shell-type transformer

b) Core-type transformer

c) Distribution transformer

d) Auto-transformer

What is the main disadvantage of using oil-filled transformers?

a) High cost

b) Fire hazard

c) Low efficiency

d) Limited lifespan

How does a transformer step up or step down voltage?

a) By changing the core material

b) By varying the frequency

c) By changing the turns ratio

d) By adjusting the load

TOP 100 MCQS On Electrical Transformer

What is the primary application of a step-up transformer?

a) Power distribution

b) Electrical isolation

c) Voltage regulation

d) Transmission of electricity

TOP 100 MCQS On Electrical Transformer

What is the typical range of power ratings for distribution transformers?

a) 1-50 kVA

b) 100-500 kVA

c) 1-10 MVA

d) 10-100 MVA

Which type of transformer is commonly used in electronic devices?

a) Power transformer

b) Isolation transformer

c) Auto-transformer

d) Distribution transformer

TOP 100 MCQS On Electrical Transformer

What is the primary cause of transformer losses?

a) Core losses

b) Copper losses

c) Hysteresis losses

d) Eddy current losses

What is the main advantage of using a three-phase transformer?

a) Higher efficiency

b) Lower cost

c) Smaller size

d) Improved voltage regulation

Which parameter is directly proportional to the size of a transformer?

a) Voltage rating

b) Current rating

c) Power rating

d) Efficiency

What is the function of the Buchholz relay in a transformer?

a) To protect against overloading

b) To detect oil leakage

c) To prevent short circuits

d) To monitor temperature

TOP 100 MCQS On Electrical Transformer

What is the primary purpose of using transformers in electrical systems?

a) To convert AC to DC

b) To increase power generation

c) To step up or step down voltage

d) To regulate current flow

TOP 100 MCQS On Electrical Transformer

What is the primary function of an electrical transformer?

a) Voltage regulation

b) Current regulation

c) Power generation

d) Energy storage

Which material is commonly used as the core of an electrical transformer?

a) Copper

b) Aluminum

c) Iron

d) Silver

What is the efficiency range of a typical electrical transformer?

a) 50-60%

b) 70-80%

c) 90-95%

d) 100%

TOP 100 MCQS On Electrical Transformer

What is the formula to calculate the turns ratio of a transformer?

a) Turns ratio = Primary voltage / Secondary voltage

b) Turns ratio = Secondary voltage / Primary voltage

c) Turns ratio = Primary current / Secondary current

d) Turns ratio = Secondary current / Primary current

Which type of transformer has a laminated core?

a) Step-up transformer

b) Step-down transformer

c) Auto-transformer

d) Distribution transformer

TOP 100 MCQS On Electrical Transformer

What is the purpose of the transformer oil in an electrical transformer?

a) Insulation

b) Cooling

c) Voltage regulation

d) Current control

TOP 100 MCQS On Electrical Transformer

What happens to the voltage in a step-up transformer?

a) Increases

b) Decreases

c) Remains the same

d) Depends on the load

Which of the following is not a type of transformer based on construction?

a) Shell-type transformer

b) Core-type transformer

c) Distribution transformer

d) Auto-transformer

TOP 100 MCQS On Electrical Transformer

What is the primary reason for using a transformer in electrical systems?

a) To reduce power losses

b) To increase voltage levels

c) To control current flow

d) To improve power factor

Which parameter determines the rating of a transformer?

a) Voltage

b) Current

c) Power

d) All of the above

What is the frequency typically used in power distribution transformers?

a) 50 Hz

b) 60 Hz

c) 50-60 Hz

d) Variable frequency

TOP 100 MCQS On Electrical Transformer

What is the function of the tap changer in a transformer?

a) To change the voltage ratio

b) To change the current ratio

c) To adjust the load

d) To control the power factor

Which transformer is commonly used in electrical substations?

a) Distribution transformer

b) Power transformer

c) Step-up transformer

d) Step-down transformer

What is the ideal power factor for a transformer?

a) 0.5

b) 0.8

c) 1.0

d) 1.5

What is the typical cooling method used in large power transformers?

a) Air cooling

b) Water cooling

c) Oil cooling

d) Forced cooling

What is the effect of loading a transformer beyond its rated capacity?

a) Increases efficiency

b) Reduces losses

c) Decreases lifespan

d) Improves voltage regulation

Which transformer configuration allows for multiple voltage levels?

a) Single-phase transformer

b) Three-phase transformer

c) Multi-tap transformer

d) Delta-wye transformer

TOP 100 MCQS On Electrical Transformer

What is the purpose of the conservator tank in a transformer?

a) To store oil

b) To prevent oil leakage

c) To maintain oil level

d) To cool the transformer

Which type of transformer has a variable turns ratio?

a) Step-up transformer

b) Step-down transformer

c) Auto-transformer

d) Distribution transformer

What is the maximum efficiency achieved by modern transformers?

a) 50%

b) 75%

c) 90%

d) 100%

TOP 100 MCQS On Electrical Transformer

Which transformer has a high turns ratio?

a) Step-up transformer

b) Step-down transformer

c) Auto-transformer

d) Distribution transformer

What is the function of the bushings on a transformer?

a) To provide mechanical support

b) To connect electrical cables

c) To insulate high-voltage connections

d) To control current flow

Which parameter is not considered during transformer design?

a) Voltage regulation

b) Efficiency

c) Current control

d) Power factor

TOP 100 MCQS On Electrical Transformer

What is the typical insulation material used in transformers?

a) PVC

b) Fiberglass

c) Mineral oil

d) Silicon rubber

Which type of transformer has a continuous winding?

a) Shell-type transformer

b) Core-type transformer

c) Distribution transformer

d) Auto-transformer

What is the main disadvantage of using oil-filled transformers?

a) High cost

b) Fire hazard

c) Low efficiency

d) Limited lifespan

How does a transformer step up or step down voltage?

a) By changing the core material

b) By varying the frequency

c) By changing the turns ratio

d) By adjusting the load

TOP 100 MCQS On Electrical Transformer

What is the primary application of a step-up transformer?

a) Power distribution

b) Electrical isolation

c) Voltage regulation

d) Transmission of electricity

What is the typical range of power ratings for distribution transformers?

a) 1-50 kVA

b) 100-500 kVA

c) 1-10 MVA

d) 10-100 MVA

Which type of transformer is commonly used in electronic devices?

a) Power transformer

b) Isolation transformer

c) Auto-transformer

d) Distribution transformer

What is the primary cause of transformer losses?

a) Core losses

b) Copper losses

c) Hysteresis losses

d) Eddy current losses

What is the main advantage of using a three-phase transformer?

a) Higher efficiency

b) Lower cost

c) Smaller size

d) Improved voltage regulation

Which parameter is directly proportional to the size of a transformer?

a) Voltage rating

b) Current rating

c) Power rating

d) Efficiency

What is the function of the Buchholz relay in a transformer?

a) To protect against overloading

b) To detect oil leakage

c) To prevent short circuits

d) To monitor temperature

TOP 100 MCQS On Electrical Transformer

What is the primary purpose of using transformers in electrical systems?

a) To convert AC to DC

b) To increase power generation

c) To step up or step down voltage

d) To regulate current flow

TOP 100 MCQS On Electrical Transformer

What is the relationship between primary and secondary currents in a transformer?

a) Directly proportional

b) Inversely proportional

c) Equal

d) Unrelated

Which type of transformer has a higher efficiency

Which type of transformer has a higher efficiency: a step-up transformer or a step-down transformer?

a) Step-up transformer

b) Step-down transformer

c) Both have the same efficiency

d) Efficiency depends on the load

What is the purpose of the core in an electrical transformer?

a) To provide mechanical support

b) To store energy

c) To reduce losses

d) To control current flow

What is the primary role of the windings in a transformer?

a) To convert electrical energy into mechanical energy

b) To convert mechanical energy into electrical energy

c) To provide insulation

d) To induce voltage

What happens to the current in a step-up transformer compared to a step-down transformer?

a) Increases

b) Decreases

c) Remains the same

d) Depends on the load

Which type of transformer is commonly used to match impedance between circuits?

a) Step-up transformer

b) Step-down transformer

c) Isolation transformer

d) Auto-transformer

What is the typical frequency range for transformers used in power systems?

a) 50 Hz

b) 60 Hz

c) 400 Hz

d) Variable frequency

What is the purpose of the magnetic core in a transformer?

a) To provide mechanical strength

b) To create a closed magnetic circuit

c) To cool the transformer

d) To reduce insulation requirements

Which parameter is inversely related to the turns ratio of a transformer?

a) Voltage

b) Current

c) Power

d) Efficiency

What is the function of the cooling system in a transformer?

a) To prevent overheating

b) To reduce losses

c) To maintain insulation

d) To control voltage

TOP 100 MCQS On Electrical Transformer

Which transformer configuration is commonly used for long-distance power transmission?

a) Single-phase transformer

b) Three-phase transformer

c) Multi-tap transformer

d) Delta-wye transformer

What is the typical voltage range for high-voltage transformers?

a) 120V-240V

b) 1000V-5000V

c) 10 kV-50 kV

d) 100 kV-500 kV

How does a transformer achieve electrical isolation?

a) By using magnetic flux

b) By using insulation material

c) By controlling voltage

d) By adjusting frequency

What is the main advantage of using an auto-transformer?

a) Higher efficiency

b) Lower cost

c) Smaller size

d) Improved voltage regulation

What is the typical lifespan of a well-maintained electrical transformer?

a) 10-15 years

b) 20-30 years

c) 40-50 years

d) Over 50 years

Which transformer parameter is critical for determining voltage regulation?

a) Turns ratio

b) Core material

c) Load current

d) Transformer impedance

TOP 100 MCQS On Electrical Transformer

What is the primary function of the voltage regulator in a transformer?

a) To maintain a constant output voltage

b) To vary the turns ratio

c) To control load current

d) To reduce losses

What is the typical size range for distribution transformers?

a) 1-50 kVA

b) 100-500 kVA

c) 1-10 MVA

d) 10-100 MVA

TOP 100 MCQS On Electrical Transformer

Which transformer type is commonly used for voltage conversion in electronic devices?

a) Step-up transformer

b) Step-down transformer

c) Isolation transformer

d) Auto-transformer

What is the main cause of transformer failures?

a) Overloading

b) Short circuits

c) Insulation breakdown

d) Aging of core material

TOP 100 MCQS On Electrical Transformer

How does a transformer provide electrical isolation between its primary and secondary circuits?

a) By using insulating materials

b) By adjusting frequency

c) By varying the turns ratio

d) By controlling temperature

What is the function of the conservator tank in an oil-filled transformer?

a) To store oil

b) To maintain oil level

c) To cool the transformer

d) To prevent oil leakage

Which parameter is directly proportional to the size of a transformer core?

a) Voltage rating

b) Current rating

c) Power rating

d) Efficiency rating

TOP 100 MCQS On Electrical Transformer

What is the main purpose of the load tap changer in a transformer?

a) To adjust voltage levels

b) To control power factor

c) To regulate current flow

d) To reduce losses

Which type of transformer is commonly used for voltage step-up in power transmission?

a) Step-up transformer

b) Step-down transformer

c) Distribution transformer

d) Auto-transformer

What is the typical insulation class used in transformers?

a) Class A

b) Class B

c) Class F

d) Class H

TOP 100 MCQS On Electrical Transformer

What is the main disadvantage of using air-core transformers?

a) Lower efficiency

b) Limited power handling

c) Higher cost

d) Increased losses

How does a transformer regulate voltage under varying load conditions?

a) By adjusting the turns ratio

b) By varying the frequency

c) By controlling cooling

d) By changing the core material

What is the function of the magnetic shunt in a transformer?

a) To control current flow

b) To provide mechanical support

c) To reduce magnetic flux

d) To improve voltage regulation

Which type of transformer has a single winding with multiple taps?

a) Step-up transformer

b) Step-down transformer

c) Auto-transformer

d) Distribution transformer

TOP 100 MCQS On Electrical Transformer

What is the main advantage of using amorphous core transformers?

a) Higher efficiency

b) Lower cost

c) Smaller size

d) Improved insulation

Which parameter is critical for determining the cooling method of a transformer?

a) Voltage rating

b) Current rating

c) Power rating

d) Load capacity

What is the primary purpose of the transformer impedance?

a) To regulate voltage

b) To control current flow

c) To limit short-circuit currents

d) To reduce losses

TOP 100 MCQS On Electrical Transformer

What is the effect of increasing the frequency on transformer size?

a) Decreases size

b) Increases size

c) No effect on size

d) Depends on the load

Which transformer type is commonly used for voltage conversion in power systems?

a) Step-up transformer

b) Step-down transformer

c) Distribution transformer

d) Auto-transformer

What is the function of the gasket in a transformer?

a) To provide insulation

b) To prevent oil leakage

c) To control

What is the function of the gasket in a transformer?

a) To provide insulation

b) To prevent oil leakage

c) To control temperature

d) To regulate voltage

What is the typical impedance range for power transformers?

a) 1-5%

b) 5-10%

c) 10-15%

d) 15-20%

Which type of transformer is commonly used for step-up and step-down applications in substations?

a) Power transformer

b) Distribution transformer

c) Isolation transformer

d) Auto-transformer

What is the purpose of the grounding system in a transformer?

a) To provide electrical safety

b) To control voltage

c) To reduce losses

d) To improve efficiency

What is the primary cause of transformer noise?

a) Core vibrations

b) Winding insulation

c) Oil flow

d) Cooling fans

Which parameter is critical for determining the insulation class of a transformer?

a) Voltage rating

b) Current rating

c) Power rating

d) Temperature rise

What is the typical efficiency range of modern distribution transformers?

a) 50-60%

b) 70-80%

c) 90-95%

d) 100%

TOP 100 MCQS On Electrical Transformer

Which transformer parameter is critical for reducing losses?

a) Core material

b) Winding material

c) Insulation thickness

d) Cooling system

What is the primary function of the oil surge relay in a transformer?

a) To protect against overloading

b) To detect oil leakage

c) To prevent short circuits

d) To monitor oil level

Which type of transformer is commonly used for voltage conversion in industrial applications?

a) Step-up transformer

b) Step-down transformer

c) Distribution transformer

d) Auto-transformer

What is the typical range of power factors for transformers?

a) 0.5-0.7

b) 0.8-0.9

c) 1.0-1.2

d) 1.5-1.7

Which parameter is critical for determining the cooling capacity of a transformer?

a) Core material

b) Winding material

c) Insulation type

d) Cooling medium

What is the function of the breather in an oil-filled transformer?

a) To filter oil

b) To maintain oil level

c) To prevent moisture ingress

d) To control oil temperature

What is the primary purpose of the transformer bushings?

a) To connect cables

b) To insulate high-voltage connections

c) To regulate current flow

d) To control voltage

Which type of transformer has a higher power density?

a) Dry-type transformer

b) Oil-filled transformer

c) Amorphous core transformer

d) Air-core transformer

TOP 100 MCQS On Electrical Transformer

What is the function of the relay in a transformer protection system?

a) To control voltage

b) To regulate current

c) To detect faults

d) To monitor temperature

Which transformer parameter is critical for determining short-circuit withstand capability?

a) Voltage rating

b) Current rating

c) Impedance

d) Power factor

What is the primary purpose of the transformer enclosure?

a) To provide mechanical support

b) To reduce noise

c) To protect against environmental factors

d) To improve efficiency

TOP 100 MCQS On Electrical Transformer

Which transformer configuration is commonly used for power distribution in buildings?

a) Single-phase transformer

b) Three-phase transformer

c) Multi-tap transformer

d) Delta-wye transformer

What is the typical lifespan of transformer insulation?

a) 5-10 years

b) 10-20 years

c) 20-30 years

d) Over 30 years

TOP 100 MCQS On Electrical Transformer

What is the primary purpose of the transformer neutral point?

a) To provide a reference voltage

b) To balance phase currents

c) To control voltage fluctuations

d) To reduce losses

Which transformer parameter is critical for determining voltage regulation?

a) Turns ratio

b) Core material

c) Load current

d) Transformer impedance

What is the typical size range for power transformers used in substations?

a) 100 kVA – 500 kVA

b) 1 MVA – 10 MVA

c) 10 MVA – 100 MVA

d) Over 100 MVA

Which type of transformer is commonly used for voltage conversion in renewable energy systems?

a) Step-up transformer

b) Step-down transformer

Ans a) – Step – up transformer

In renewable energy systems, especially in solar and wind power applications, the type of transformer commonly used for voltage conversion is the "step-up transformer." This transformer increases the voltage level of the generated electricity to facilitate long-distance transmission through power lines, minimizing energy losses.

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