Transformer MCQs

Transformer MCQs

1.The secondary winding of which of the following transformers is always kept closed?

  1. Current transformer
  2. Voltage transformer
  3. Power transformer
  4. Step down transformer

 2.If the supply frequency of a transformer increases, the secondary output voltage of the transformer?

  1. Increase
  2. Decrease
  3. Remain the same
  4. Any of the above

3.Power transformers are designed to have maximum efficiency at …

  1. Full load
  2. 50% load
  3. 80% load
  4. no load

4.The open-circuit test in a transformer is used to measure ….

  1. Copper loss
  2. Winding loss
  3. Total loss
  4. Core loss

5.The leakage flux in a transformer depends upon the value of …

  1. Frequency
  2. Mutual Flux
  3. Load current
  4. Applied Voltage

6.Lamination of the transformer core is made of …

  1. Cast Iron
  2. Silicon Steel
  3. Aluminum
  4. Cast Steel

7.Breather is provided in a transformer to …

  1. Absorb moisture of air during breathing
  2. provide cold air in the transformer
  3. The filter of transformer oil
  4. None of above

8.Which of the following losses varies with the load in the transformer?

  1. Core loss
  2. Copper loss
  3. Both core & copper loss
  4. None of the above

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9.A transformer transform …

  1. Current
  2. Voltage & current
  3. Frequency
  4. Voltage

10.Transformer core are laminated in order to ..

  1. Reduce hysteresis loss
  2. Reduce hysteresis & eddy current loss
  3. Minimize eddy current loss
  4. Copper loss

11.A transformer has negative voltage regulation when its load power factor is…

  1. Lagging
  2. Leading
  3. Unity
  4. Any of the above

12.The main purpose of performing short circuit test in a transformer is to measure its ..

  1. Copper loss
  2. Core loss
  3. Insulation Resistance
  4. Total loss

13.The short circuit test in a transformer is performed on ..

  1. Low voltage side
  2. High voltage side
  3. Either 1 & 2
  4. Both 1 & 2

14.Which of the following loss in a transformer is zero even at full load..

  1. Eddy current loss
  2. Core loss
  3. Copper loss
  4. Friction loss

15.In a transformer the resistance between its primary and secondary is ..

  1. Zero
  2. Infinite
  3. 1000 ohm
  4. 100 ohm

16.The efficiency of two identical transformers under load conditions can be determined by ..

  1. Short Circuit test
  2. Open Circuit test
  3. No Load test
  4. Back to Back test (Sumpner Test)

17.The transformer ratings are usually expressed in terms of ..

  1. KW
  2. KVAR
  3. KVA
  4. Volts

18.Which winding in a transformer has more number of turns?

  1. Secondary winding
  2. primary winding
  3. High voltage winding
  4. Low voltage winding

19.Oil is provided in an oil-filled transformer for ..

  1. Lubrication
  2. Insulation
  3. cooling
  4. both cooling and insulation

20.Iron loss in a transformer can be determined by

  1. Open circuit test
  2. Short Circuit test
  3. Both 1 & 2
  4. None of the above

21.The path of magnetic flux in a transformer should have …

  1. Low resistance
  2. Low reluctance
  3. High Resistance
  4. High Reluctance

22.The noise of the transformer is mainly due to ..

  1. Cooling fan
  2. magnetostriction in an iron core
  3. Mechanical vibration
  4. All of the above

 23.In a transformer the primary flux is _______ secondary flux.

  1. Greater than
  2. Smaller than
  3. Either 1 & 2
  4. Equal to

24.What would happen if a transformer is connected to a DC supply?

  1. No effect
  2. Operate with high efficiency
  3. Damage the transformer
  4. Operate with low frequency

25.The friction loss in a transformer is..

  1. 20%
  2. 0%
  3. 50%
  4. more than 50%

26.In an Auto Transformer, The Primary and Secondary are _______Coupled.

  1. Electrically only
  2. Magnetically only
  3. Both electrically & magnetically
  4. None of the above
Transformer MCQs
Electrical/Electronics MCQs