EM Practice Quiz1

The use of instruments is merely confined within laboratories as standardizing instruments.

• absolute

• indicating

• recording

• integrating

• none of the above

Which of the following instruments indicate the instantaneous value of the electrical quantity being measured at the time at which it is being measured ?

• Absolute instruments

• Indicating instruments

• Recording instruments

• Integrating instruments

instruments are those which measure the total quantity of electricity delivered in a particular time.

• Absolute

• Indicating

• Recording

• Integrating

Which of the following are integrating instruments ?

• Ammeters

• Voltmeters

• Wattmeters

• Ampere-hour and watt-hour meters

Resistances can be measured with the help of-----------

• wattmeters

• voltmeters

• ammeters

• ohmmeters and resistance bridges

• all of the above

According to application, instruments are classified as----

• switch board

• portable

• both (a) and (b)

• moving coil

• moving iron

Which of the following essential features is possessed by an indicating instrument ?

• Deflecting device

• Controlling device

• Damping device

• All of the above

A device prevents the oscillation of the moving system and enables the latter to

reach its final position quickly.

• deflecting

• controlling

• damping

• any of the above

The spring material used in a spring control device should have the following property.

• Should be non-magnetic

• Most be of low temperature co-efficient

• Should have low specific resistance

• Should not be subjected to fatigue

• All of the above

Which of the following properties a damping oil must possess?

• Must be a good insulator

• Should be non-evaporating

• Should not have corrosive action upon the metal of the vane

• The viscosity of the oil should not change with the temperature

• All of the above