Transformer MCQ Question And Answer | ITI ELECTRICIAN

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ITI ELECTRICIAN | Transformer MCQ

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1.
Which type of transformer is used for high frequency application?

Ring core transformer
Ferrite core transformer
Silicon steel core transformer
Grain oriented core transformer

2.
What is the relationship between primary voltage (E1, V1) and secondary voltage (E2, V2) in a ideal transformer?

E1= V1 and E2 = V2 E1= V1 E2 = V2
E1 > V1 and E2 > V2 E1> V1 E2> V2
E1 < V1 and E2 < V2 E1 < V1 E2 < V2
E1 = V2 and E2 = V1 E1 = V2 E2 = V1

3.
What is the function of conservator in transformer?

Prevents the moisture entry
Transfers the heat to atmosphere
Allows to release internal pressure
Allows expansion of oil level due to load variation

4.
Which loss of transformer is determined by short circuit test?

Copper loss
Windage loss
Hysteresis loss
Eddy current loss

5.
Calculate the voltage regulation in percentage of the transformer if the no load voltage is 240 volt and full load voltage is 220 volt?

7.2 %
8.3 %
8.71 %
9.09 %

6.
What is the purpose of using laminated core in transformer?

Reduce copper loss
Reduce hysteresis loss
Reduce mechanical loss
Reduce eddy current loss

7.
What is the cooling method of transformer?

Oil natural cooling
Oil natural air forced cooling
Oil forced air forced cooling
Oil natural water forced cooling

8.
What is the condition for obtaining maximum efficiency from transformer?

Copper loss > Iron loss
Copper loss < Iron loss
Copper loss = Iron loss
Copper loss =Eddy current loss

9.
What is the function of top float switch of buchholz relay in transformer?

Activate in moisture presence
Activate at overloading condition
Activate at open circuit condition
Activate at high temperature condition

10.
Why the core of current transformer is having low reactance and low core losses?

To minimise the burden
To maintain constant output
To prevent high static shield
To minimise the error in reading

11.
How the error in reading of a potential transformer can be reduced?

Using thin laminated core
Providing long magnetic path
Using high flux density material
Providing good quality core material

12.
Why the load is disconnected before the OFF load tap changing operation?

To disconnect the tappings from neutral point
To disconnect the moving contact of the diverter
To avoid heavy sparking at the contact points
To provide an electrical isolation for the windings

13.
What is the name of the part in power transformer?

Breather
Tap charger
Explosion vent
Buchholz relay

14.
Which condition is absolutely essential for parallel operation of two transformers?

Nature of load
Type of cooling
Phase sequence
Class of insulation used

15.
Which construction technique is used to reduce copper loss in larger transformers?

Use of laminated core
By reducing core thickness
By using grain oriented core
Use stepped core arrangement

16.
What is the name of transformer?

Air core transformer
Iron core transformer
Ring core transformer
Ferrite core transformer

17.
Which transformer is used to measure high voltage installations?

Pulse transformers
Ignition transformers
Potential transformers
Constant voltage transformers

18.
How does the moisture is controlled in breather fitted on power transformers?

Using silica gel
Using transformer oil
Using sodium chloride
Using ammonium jelly

19.
Which power loss is assessed by open-circuit test on transformer?

Hysteresis loss only
Eddy current loss only
Copper loss
Core loss

20.
Which is determined by the crackle test of transformer oil?

Acidity
Moisture
Viscosity
Dielectric strength

21.
Which material is used to make core of power transformer?

Soft iron
Rolled steel
Copper alloy
Cold rolled grain oriented

22.
What is the name of transformer?

Auto transformer
Core type transformer
Shell type transformer
Audio frequency transformer

23.
What is the purpose of providing explosion vent in a power transformer?

Air releasing
Heat releasing
Pressure releasing
Moisture releasing

24.
What is the function of buchholz relay in power transformer?

Protection from high temperature
Protection from moisture entering in oil
Protection from pressure loading in tank
Protection from both overloading and short circuit

25.
Why primary of potential transformer is wound with thin wire and large number of turns?

To offer high inductance
To obtain required voltage ratio
To regulate the primary current
To stabilise input and output voltage

26.
Why distribution transformers are normally connected as primary in delta and secondary in star?

To avoid over loading
To maintain constant voltage
To reduce transformer losses
To easy distribution of 3 phase 4 wire system

27.
Which type of emf is induced in an ideal two winding transformer?

Self induced emf
Mutually induced emf
Statically induced emf
Dynamically induced emf

28.
How to determine copper loss in a transformer?

Ratio test
Impulse test
Short circuit test
Open circuit test

29.
Why ferrite core is used in radio receivers?

To reduce the constant losses
To reduce electric interference
To increase the quality of sound
To increase the efficiency of receivers

30.
What is the advantage of stepped core arrangement in larger transformers?

Minimizes copper use
Reduces hysteresis loss
Reduces eddy current loss
Reduces the space for core

31.
Which material is used in breather to prevent moisture entering in the transformer oil?

Silica gel
Sodium chloride
Ammonium chloride
Charcoal and salt mixture

32.
What is the disadvantage of auto transformer?

More losses
Heavier in weight
Poor voltage regulation
Cannot isolate the secondary winding

33.
Which cooling method is used in pole mounting distribution transformer?

Air natural
Oil natural air blast
Oil forced air forced
Oil natural air natural

34.
What is the composition of steel and silicon steel in transformer core?

Steel 97% and silicon 3%
Steel 95% and silicon 5%
Steel 93% and silicon 7%
Steel 90% and silicon 10%

35.
What is the purpose of tap changing in power transformers?

Maintain primary voltage constant
Change voltage ratio in distribution
Maintain secondary voltage constant
Load the transformer for maximum efficiency

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Transformer MCQ Question and Answer | ITI ELECTRICIAN

PLEASE SELECT YOUR LANGUAGE FROM BELOW

ITI ELECTRICIAN | Transformer MCQ

PLEASE SELECT YOUR LANGUAGE FROM BELOW

1.Which type of transformer is used for high frequency application?

2.What is the relationship between primary voltage (E1, V1) and secondary voltage (E2, V2) in a ideal transformer?

3.What is the function of conservator in transformer?

4.Which loss of transformer is determined by short circuit test?

5.Calculate the voltage regulation in percentage of the transformer if the no load voltage is 240 volt and full load voltage is 220 volt?

6.What is the purpose of using laminated core in transformer?

7.What is the cooling method of transformer?

8.What is the condition for obtaining maximum efficiency from transformer?

9.What is the function of top float switch of buchholz relay in transformer?

10.Why the core of current transformer is having low reactance and low core losses?

11.How the error in reading of a potential transformer can be reduced?

12.Why the load is disconnected before the OFF load tap changing operation?

13.What is the name of the part in power transformer?

14.Which condition is absolutely essential for parallel operation of two transformers?

15.Which construction technique is used to reduce copper loss in larger transformers?

16.What is the name of transformer?

17.Which transformer is used to measure high voltage installations?

18.How does the moisture is controlled in breather fitted on power transformers?

19.Which power loss is assessed by open-circuit test on transformer?

20.Which is determined by the crackle test of transformer oil?

21.Which material is used to make core of power transformer?

22.What is the name of transformer?

23.What is the purpose of providing explosion vent in a power transformer?

24.What is the function of buchholz relay in power transformer?

25.Why primary of potential transformer is wound with thin wire and large number of turns?

26.Why distribution transformers are normally connected as primary in delta and secondary in star?

27.Which type of emf is induced in an ideal two winding transformer?

28.How to determine copper loss in a transformer?

29.Why ferrite core is used in radio receivers?

30.What is the advantage of stepped core arrangement in larger transformers?

31.Which material is used in breather to prevent moisture entering in the transformer oil?

32.What is the disadvantage of auto transformer?

33.Which cooling method is used in pole mounting distribution transformer?

34.What is the composition of steel and silicon steel in transformer core?

35.What is the purpose of tap changing in power transformers?

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1.
Which type of transformer is used for high frequency application?

2.
What is the relationship between primary voltage (E1, V1) and secondary voltage (E2, V2) in a ideal transformer?

3.
What is the function of conservator in transformer?

4.
Which loss of transformer is determined by short circuit test?

5.
Calculate the voltage regulation in percentage of the transformer if the no load voltage is 240 volt and full load voltage is 220 volt?

6.
What is the purpose of using laminated core in transformer?

7.
What is the cooling method of transformer?

8.
What is the condition for obtaining maximum efficiency from transformer?

9.
What is the function of top float switch of buchholz relay in transformer?

10.
Why the core of current transformer is having low reactance and low core losses?

11.
How the error in reading of a potential transformer can be reduced?

12.
Why the load is disconnected before the OFF load tap changing operation?

13.
What is the name of the part in power transformer?

14.
Which condition is absolutely essential for parallel operation of two transformers?

15.
Which construction technique is used to reduce copper loss in larger transformers?

16.
What is the name of transformer?

17.
Which transformer is used to measure high voltage installations?

18.
How does the moisture is controlled in breather fitted on power transformers?

19.
Which power loss is assessed by open-circuit test on transformer?

20.
Which is determined by the crackle test of transformer oil?

21.
Which material is used to make core of power transformer?

22.
What is the name of transformer?

23.
What is the purpose of providing explosion vent in a power transformer?

24.
What is the function of buchholz relay in power transformer?

25.
Why primary of potential transformer is wound with thin wire and large number of turns?

26.
Why distribution transformers are normally connected as primary in delta and secondary in star?

27.
Which type of emf is induced in an ideal two winding transformer?

28.
How to determine copper loss in a transformer?

29.
Why ferrite core is used in radio receivers?

30.
What is the advantage of stepped core arrangement in larger transformers?

31.
Which material is used in breather to prevent moisture entering in the transformer oil?

32.
What is the disadvantage of auto transformer?

33.
Which cooling method is used in pole mounting distribution transformer?

34.
What is the composition of steel and silicon steel in transformer core?

35.
What is the purpose of tap changing in power transformers?