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MCQs on Transformer

May 3, 2017 by admin

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 1. The purpose of using transformer oil is to
(a) provide cooling.
(b) absorb  heat.
(c) provide insulation.
(d) all of the above.  

Answer

           D 

 2. Negative voltage regulation of  transformers indicate that the load is
(a) resistive.
(b) capacitive.
(c) inductive.
(d) all of the above.  

Answer

           B 

 3. If the input frequency of a transformers decreases, its magnetic flux in core will
(a) increases.
(b) decrease.
(c) remain same.
(d) none of the above.  

Answer

           A 

 4. Which of the following meter is used to measure the iron loss of a transformer?
(a) low power factor wattmeter.
(b) unity power factor wattmeter.
(c) frequency meter.
(d) high power factor wattmeter.  

Answer

           A 

 5. If the primary of a transformer is connected to a DC supply then
(a) nothing is happened.
(b) core losses are increased.
(c) primary may burn out.
(d) leakage flux is increased.  

Answer

           C 

  6. An isolation transformer has primary to secondary turn ratio of
(a) 1 : 2.
(b) 1 : 1.
(c) 2 : 1.
(d) 1:100.  

Answer

           B 

 7. When open circuit test is performed on transformer, the primary is supplied
(a) rated kVA.
(b) rated voltage.
(c) rated current.
(d) full-load current.  

Answer

           B 

 8. Which of the following losses are known as variable losses?
(a) Hysteresis losses.
(b) Eddy current losses.
(c) Copper losses.
(d) Core losses.  

Answer

           C 

 9. Open circuit test on transformers is conducted to determine
(a) hysteresis losses.
(b) copper losses.
(c) core losses.
(d) eddy current losses.  

Answer

           C 

You may also read
• Why all the voltage levels are multiples of 11 kV?
• Why Motor rated in kW instead of kVA?

 10. Short circuit test on transformers is conducted to determine
(a) hysteresis losses.
(b) copper losses.
(c) core losses.
(d) eddy current losses.    

Answer

           B 

 11. In a transformer, the eddy current losses are affected by
(a) frequency.
(b) thickness.
(c) flux density.
(d) all of the above.  

Answer

           D 

 12. Which of the following transformer secondary winding is connected to earth?
(a) Potential Transformer.
(b) Current Transformer.
(c) Both C.T. and P.T.
(d) None of the above.

Answer

           C 

 13. The permeability of the core of an ideal transformer must be
(a) negative.
(b) zero.
(c) equal to air.
(d) infinite.    

Answer

           D 

 14. The core of a high frequency transformer is sometime made of ferrite because ferrite has
(a) high hysteresis.
(b) high resistance.
(c) high specific gravity.
(d) low permeability.   

Answer

           B 

 15. The secondary side of the current transformer is earthed in order to
(a) reduce losses.
(b) avoid electric shock.
(c) avoid the insulation breakdown.
(d) increase accuracy.  

Answer

           C 

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Also Read :

  • Why all the voltage levels are multiples of 11 kV? asked by Bahu
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  • What is the meaning of DYN11 in a transformer? asked by Hiter
  • What is the difference between Earthing and Grounding? asked by admin


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