ISRO Technician-B Electrician Question Paper - 2017 (Set - 1) with Answer Key

ISRO Technician-B Electrician Question Paper - 2017 (Set - 1) with Answer Key

26) Efficiency of a power transformer is in the order of

Answer is:

97%

27) In a step down single phase power transformer, primary voltage is 22 kV and secondary voltage is 220V. When secondary is delivering a load current of 100 A, primary current is

Answer is:

1A

28) What will be the copper loss at half load of a single phase transformer which is having a copper loss of 1000 W at full load?

Answer is:

250 W

29) Two dissimilar metals such as iron and copper are joined together to form a part of a device. When the junction is heated, a voltage will be developed across the open ends of the wires. What is this device known as

Answer is:

thermocouple

30) What are the measurements for which analog multimeter can be used without battery?

Answer is:

voltage and current

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