Transformer Testing Quiz

1.Power required during the open circuit and short circuit test is?

• losses incurring in the transformer

• executing the power requirements by measuring instruments

• power for the core losses only

• all of the mentioned

2.Which of the below estimations require results of both open circuit test and short circuit test?

• Efficiency

• Equivalent impedance of one side of the winding

• Voltage regulation for exact circuit

• All of the mentioned

3.A single phase transformer of 2200/220 V having rated l.v. current of 150 A has to undergo open circuit test on h.v. side. Which of the below instruments range should be used?

• 6A, 200V

• 150A, 22V

• 60A, 220V

• 6A, 20V

4.Sumpner’s test is conducted on transformers to study effect of ____________

• a) Temperature

• b) Stray losses

• c) All-day efficiency

• d) Cannot be determined

5. Sumpner’s test is performed on _________

• a) Single transformer at a time
  
  
  

• b) Only two transformers at a time

• c) Minimum 2 transformers at a time

• d) Many transformers at a time

6.When secondaries are connected in phase opposition, power drawn by the circuit is equal to ___________

• a) 2*P_i
  
  
  

• b) Pi²

• c) Pi

• d) 2*Pc

7.For the parallel operation of two single phase transformers it is necessary that they should have ________

8.Why transformers are paralleled?

• a) Economical than replacing by one single large unit

• b) Less maintaining cost

• c) To handle more load

• d) Economical factors, more load capacity, less maintenance

9. In a transformer, the turns ratio affects which of the following?

• a) Voltage levels

• b) Current levels

• c) Both voltage and current levels

• d) None of the above

10. What is the significance of the short circuit test in transformer testing?

• To measure the efficiency of the transformer

• To determine the copper losses

• To assess the voltage regulation

• To evaluate the insulation resistance