Transformers Online Test – Multiple Choice Questions and Answers

1. The thickness of a 50 Hz transformer lamination is

 
 
 
 

2. Transformer humming sound is reduced by the

 
 
 
 

3. 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

 
 
 
 

4. Transfer of electrical power from primary to secondary in a transformer takes place

 
 
 
 

5. 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

 
 
 
 

6. The required thickness of lamination in a transformer decreases when

 
 
 
 

7. 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

 
 
 
 

8. Oil in transformer is used to

 
 
 
 

9. 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

 
 
 
 

10. A power transformer is a constant

 
 
 
 

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