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

0.1A

100A

10000A

Answer is:

1A

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

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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?

1000 W

500 W

250 W

125 W

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

thermometer

thermocouple

thermistor

pyrometer

Answer is:

thermocouple

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

voltage, current and resistance

voltage and current

resistance

resistance and voltage

Answer is:

voltage and current

31) What precaution to be taken while disconnecting the ammeter from terminals of CT (Current Transformer)?

Earthing the secondary of CT

Short circuiting the terminal of the CT before disconnecting the ammeter

Switching a high resistance shunt between the terminals of CT after disconnecting the ammeter

Short circuit the terminal of the CT after disconnecting the ammeter

Answer is:

Short circuiting the terminal of the CT before disconnecting the ammeter

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

For more MCQ's Click Here

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

1A

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

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

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?

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

thermocouple

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

voltage and current

31) What precaution to be taken while disconnecting the ammeter from terminals of CT (Current Transformer)?

Short circuiting the terminal of the CT before disconnecting the ammeter

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