#### The Following Section consists of Multiple Choice Questions on Transformers.

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Transformers MCQ

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- Question 1 of 20
##### 1. Question

1 points#### When does maximum power transfer happen from the source to the load?

CorrectIncorrect - Question 2 of 20
##### 2. Question

1 points#### The coefficient of coupling between two coils is 0.45. The first coil has an inductance of 75 mH and the second coil has an inductance of 105 mH. What is the mutual inductance between the coils?

CorrectIncorrect - Question 3 of 20
##### 3. Question

1 points#### Increasing the number of turns of wire on the secondary of a transformer will

CorrectIncorrect - Question 4 of 20
##### 4. Question

1 points#### The transformer turns ratio determines

CorrectIncorrect - Question 5 of 20
##### 5. Question

1 points#### A special transformer used to convert unbalanced signals to balanced signals is the

CorrectIncorrect - Question 6 of 20
##### 6. Question

1 points#### If the primary power of an ideal transformer having a 2:1 voltage ratio is 100 W, the secondary power is

CorrectIncorrect - Question 7 of 20
##### 7. Question

1 points#### A transformer has

CorrectIncorrect - Question 8 of 20
##### 8. Question

1 points#### What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 5 Hz (frequency) source of the same voltage?

CorrectIncorrect - Question 9 of 20
##### 9. Question

1 points#### A Step Up transformer _____________.

CorrectIncorrect - Question 10 of 20
##### 10. Question

1 points#### Under what condition is D.C supply applied safely to the primary of a transformer?

CorrectIncorrect - Question 11 of 20
##### 11. Question

1 points#### An Auto-transformer (which has only one winding) may be used as a ______?

CorrectIncorrect - Question 12 of 20
##### 12. Question

1 points#### The friction losses in Real Transformers are _________?

CorrectIncorrect - Question 13 of 20
##### 13. Question

1 points#### In Three Phase Transformer, The load Current is 139.1A, and Secondary Voltage is 415V. The Rating of the Transformer would be ___________.

CorrectIncorrect - Question 14 of 20
##### 14. Question

1 points#### In Single Phase Transformer, The Primary Current and Primary Voltage is 4.55 and 11kV respectively. The Rating of the transformer would be________?.

CorrectIncorrect - Question 15 of 20
##### 15. Question

1 points#### An Isolation Transformer Has Primary to Secondary turns ratio of __________.

CorrectIncorrect - Question 16 of 20
##### 16. Question

1 points#### In an Auto Transformer, The Primary and Secondary are__________Coupled.

CorrectIncorrect - Question 17 of 20
##### 17. Question

1 points#### A Transformer______________.

CorrectIncorrect - Question 18 of 20
##### 18. Question

1 points#### Transformer is a device which:________________.

CorrectIncorrect - Question 19 of 20
##### 19. Question

1 points#### Which of the following 3-phase connection of a transformer causes interference with the neighboring communication lines:

CorrectIncorrect - Question 20 of 20
##### 20. Question

1 points#### Laminated insulations coated with varnish are normally used in the transformer

CorrectIncorrect

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Transformers MCQ 2

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- Question 1 of 20
##### 1. Question

1 points#### What kVA rating is required for a transformer that must handle a maximum load current of 8 A with a secondary voltage of 2 kV?

CorrectIncorrect - Question 2 of 20
##### 2. Question

1 points#### When the turns ratio of a transformer is 20 and the primary ac voltage is 12 V, the secondary voltage is

CorrectIncorrect - Question 3 of 20
##### 3. Question

1 points#### A certain transformer has 400 turns in the primary winding and 2,000 turns in the secondary winding. The turns ratio is

CorrectIncorrect - Question 4 of 20
##### 4. Question

1 points#### The primary winding of a transformer has 110 V ac across it. What is the secondary voltage if the turns ratio is 8?

CorrectIncorrect - Question 5 of 20
##### 5. Question

1 points#### To step 110 V ac down to 20 V ac, the turns ratio must be

CorrectIncorrect - Question 6 of 20
##### 6. Question

1 points#### If 25 W of power are applied to the primary of an ideal transformer with a turns ratio of 10, the power delivered to the secondary load is

CorrectIncorrect - Question 7 of 20
##### 7. Question

1 points#### How many primary volts must be applied to a transformer with a turns ratio of 0.1 to obtain a secondary voltage of 9 V?

CorrectIncorrect - Question 8 of 20
##### 8. Question

1 points#### In a certain loaded transformer, the secondary voltage is one-fourth the primary voltage. The secondary current is

CorrectIncorrect - Question 9 of 20
##### 9. Question

1 points#### A certain transformer has a turns ratio of 1 and a 0.85 coefficient of coupling. When 2 V ac is applied to the primary, the secondary voltage is

CorrectIncorrect - Question 10 of 20
##### 10. Question

1 points#### The primary winding of a power transformer should always be

CorrectIncorrect - Question 11 of 20
##### 11. Question

1 points#### A transformer

CorrectIncorrect - Question 12 of 20
##### 12. Question

1 points#### To step 120 V ac up to 900 V ac, the turns ratio must be

CorrectIncorrect - Question 13 of 20
##### 13. Question

1 points#### In a certain transformer, the input power to the primary is 120 W. If 8.5 W are lost to the winding resistance, what is the output power to the load, neglecting any other issues?

CorrectIncorrect - Question 14 of 20
##### 14. Question

1 points#### When a 6 V battery is connected across the primary of a transformer with a turns ratio of 8, the secondary voltage is

CorrectIncorrect - Question 15 of 20
##### 15. Question

1 points#### What is the coefficient of coupling for a transformer in which 4% of the total flux generated in the primary does not pass through the secondary?

CorrectIncorrect - Question 16 of 20
##### 16. Question

1 points#### In a Transformer , The primary flux is always _________ the secondary ( flux).

CorrectIncorrect - Question 17 of 20
##### 17. Question

1 points#### What would happen if we operate a 60 Hz Transformer on 50 Hz Source of Supply.(and how can we do that?

CorrectIncorrect - Question 18 of 20
##### 18. Question

1 points#### The rating of transformer may be expressed in ____________.

CorrectIncorrect - Question 19 of 20
##### 19. Question

1 points#### What will happen if the primary of a transformer is connected to D.C supply?

CorrectIncorrect - Question 20 of 20
##### 20. Question

1 points#### What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 500 Hz (frequency) source of the same voltage

CorrectIncorrect

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Transformers MCQ 3

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- Question 1 of 20
##### 1. Question

1 points#### The required thickness of lamination in a transformer decreases when

CorrectIncorrect - Question 2 of 20
##### 2. Question

1 points#### Oil in transformer is used to

CorrectIncorrect - Question 3 of 20
##### 3. Question

1 points#### The windings of a transformer are divided into several coils because

CorrectIncorrect - Question 4 of 20
##### 4. Question

1 points#### Transformer humming sound is reduced by the

CorrectIncorrect - Question 5 of 20
##### 5. Question

1 points#### Sludge in transformer oil is due to

CorrectIncorrect - Question 6 of 20
##### 6. Question

1 points#### A transformer used only for electrical isolation between two circuits has turns ratio which is

CorrectIncorrect - Question 7 of 20
##### 7. Question

1 points#### If 90 per cent of normal voltage and 90 per cent of normal frequency are applied to a transformer, the per cent charge in hysteresis losses will be

CorrectIncorrect - Question 8 of 20
##### 8. Question

1 points#### If 110 per cent of normal voltage and 110 per cent of normal frequency is applied to a transformer, the percentage change of eddy current losses will be

CorrectIncorrect - Question 9 of 20
##### 9. Question

1 points#### A single-phase, 2,200/200 V transformer takes 1 A at the HT side or no load at a power factor of 0.385 lagging. The iron losses are

CorrectIncorrect - Question 10 of 20
##### 10. Question

1 points#### Neglecting resistance, at constant flux density, the power required per kilogram to magnetize the iron core of a transformer is 0.8 W at 25 Hz and 2.04 W at 60 Hz. The power required per kilogram for 100 Hz is

CorrectIncorrect - Question 11 of 20
##### 11. Question

1 points#### Transfer of electrical power from primary to secondary in a transformer takes place

CorrectIncorrect - Question 12 of 20
##### 12. Question

1 points#### The thickness of a 50 Hz transformer lamination is

CorrectIncorrect - Question 13 of 20
##### 13. Question

1 points#### A power transformer is a constant

CorrectIncorrect - Question 14 of 20
##### 14. Question

1 points#### The value of flux in the emf equation of a transformer is

CorrectIncorrect - Question 15 of 20
##### 15. Question

1 points#### The leakage flux in a transformer depends upon the value of

CorrectIncorrect - Question 16 of 20
##### 16. Question

1 points#### The voltage regulation of a transformer at full-load 0.8 power factor lag is 6 per cent. Its voltage regulation at full-load 0.8 power factor lead will be

CorrectIncorrect - Question 17 of 20
##### 17. Question

1 points#### The full-load efficiency of a transformer at 0.85 p.f. lag is 97 per cent. Its efficiency at full load 0.85 bpower factor lead will be

CorrectIncorrect - Question 18 of 20
##### 18. Question

1 points#### If a load on secondary side of a transformer increases, the current on the primary side

CorrectIncorrect - Question 19 of 20
##### 19. Question

1 points#### If a sinusoidal exciting current is applied to a transformer, the mutual flux produced is

CorrectIncorrect - Question 20 of 20
##### 20. Question

1 points#### To get sinusoidal flux in a transformer the mutual flux produced is

CorrectIncorrect

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Transformers MCQ 4

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- Question 1 of 20
##### 1. Question

1 points#### A 220V, 150V bulb is connected in series with the primary of a 220/1,100 V, 50 Hz transformer. If the load on the secondary side is disconnected, the brightness of the bulb will

CorrectIncorrect - Question 2 of 20
##### 2. Question

1 points#### The efficiency of an autotransformer for the same output compared to a two-winding transformer is

CorrectIncorrect - Question 3 of 20
##### 3. Question

1 points#### The condition for successful parallel operation of transformer is

CorrectIncorrect - Question 4 of 20
##### 4. Question

1 points#### During parallel operation of transformers incorrect polarity will result in

CorrectIncorrect - Question 5 of 20
##### 5. Question

1 points#### A 10 kVA, 400/200 V sinlge-phase transformer with 10 per cent impedance draws a steady short circuit line current of

CorrectIncorrect - Question 6 of 20
##### 6. Question

1 points#### A 400/100 V, 10 kVA two-winding transformer is reconnected as an autotransformer across a suitable voltage source. The maximum kVA is

CorrectIncorrect - Question 7 of 20
##### 7. Question

1 points#### An autotransformer having a transformation ratio of 0.8 supplies a load of 10 kW. The power transferred inductively from the primary to the secondary is

CorrectIncorrect - Question 8 of 20
##### 8. Question

1 points#### A single-phase induction regulator is a constant input transformer to obtain smooth variation of the output voltage by varying the

CorrectIncorrect - Question 9 of 20
##### 9. Question

1 points#### In operating a 400 Hz transformer at 50 Hz

CorrectIncorrect - Question 10 of 20
##### 10. Question

1 points#### In performing open circuit test of a transformer

CorrectIncorrect - Question 11 of 20
##### 11. Question

1 points#### Transformer core usually uses grain-oriented laminated sheets. The grain orientation reduces

CorrectIncorrect - Question 12 of 20
##### 12. Question

1 points#### In the circuit model of a transformer, the core loss is represented as

CorrectIncorrect - Question 13 of 20
##### 13. Question

1 points#### While performing short circuit test on a transformer, the impressed voltage magnitude is kept constant but the frequency is increased. The short circuit current will

CorrectIncorrect - Question 14 of 20
##### 14. Question

1 points#### A transformer has a hysteresis loss of 30 W at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

CorrectIncorrect - Question 15 of 20
##### 15. Question

1 points#### In a transformer, the exciting current will be in phase quadrature with the impressed voltage provided

CorrectIncorrect - Question 16 of 20
##### 16. Question

1 points#### A transformer is to be tested at full-load conditions consuming only losses from the mains. We do

CorrectIncorrect - Question 17 of 20
##### 17. Question

1 points#### In a transformer operating at constant voltage if the input frequency increases the core loss will

CorrectIncorrect - Question 18 of 20
##### 18. Question

1 points#### Grain-oriented laminated sheet steel in a transformer reduces

CorrectIncorrect - Question 19 of 20
##### 19. Question

1 points#### One transformer has leakage impedance of 1 + j 4 Ω and 3 + j 4 Ω for its primary and secondary windings, respectively. The transformer has

CorrectIncorrect - Question 20 of 20
##### 20. Question

1 points#### A single-phase transformer has its maximum efficiency at 60 per cent of full load. At full load copper loss will be

CorrectIncorrect