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

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

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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

32) What is the purpose of providing a mirror behind the pointer in a measuring instrument?

the scale is illuminated through the mirror

to observe that the pointer is bend or not

Being semi-transparent a mirror helps in the study of inner construction of the instrument

To make the reading free from an error by removing parallax between the pointer and its image

Answer is:

To make the reading free from an error by removing parallax between the pointer and its image

33) The minimum conductor area of a copper conductor used in power sub circuit should be

1 square millimeter

1.5 square millimeter

2.5 square millimeter

4 square millimeter

Answer is:

1.5 square millimeter

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

For more MCQ's Click Here

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

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

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

32) What is the purpose of providing a mirror behind the pointer in a measuring instrument?

To make the reading free from an error by removing parallax between the pointer and its image

33) The minimum conductor area of a copper conductor used in power sub circuit should be

1.5 square millimeter

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