Top 150+ Solved Electromagnetic Interference MCQ Questions Answer
Q. A voltmeter should have
a. . low internal resistance
b. . high internal resistance
c. . electrostatic plates
d. . a sensitive amplifier
Q. The major advantage of electromagnet type meter over a permanent magnetmeter is
a. . the electromagnet meter costs much less
b. the permanent magnet meter has a more sluggish coil
c. . the electromagnet meter need not be aligned with the earth’s magnetic field
d. . the electromagnet meter is more rugged
Q. The change in the direction of a compass needle, when a current carrying wireis brought near, is called
a. . electromagnetic deflection
b. . electroscopic force
c. magnetic force
d. . electrostatic force
Q. The use of _____ instruments is merely confined within laboratories asstandardizing instruments.
a. absolute
b. indicating
c. recording
d. integrating
Q. Which of the following instruments indicate the instantaneous value of theelectrical quantity being measured at the time at which it is being measured ?
a. absolute instruments
b. indicating instruments
c. recording instruments
d. integrating instruments
Q. _____ instruments are those which measure the total quantity of electricitydelivered in a particular time.
a. absolute
b. indicating
c. recording
d. integrating
Q. Which of the following are integrating instruments ?
a. ammeters
b. voltmeters
c. wattmeters
d. ampere-hour and watt-hour meters
Q. Which of the following essential features is possessed by an indicatinginstrument ?
a. deflecting device
b. controlling device
c. damping device
d. all of the above
Q. A _____ device prevents the oscillation of the moving system andenables the latter to reach its final position quickly
a. deflecting
b. controlling
c. damping
d. any of the above
Q. The spring material used in a spring control device should have thefollowing property.
a. should be non-magnetic
b. most be of low temperature co-efficient
c. should have low specific resistance
d. all of the above
Q. Which of the following properties a damping oil must possess ?
a. must be a good insulator
b. should not have corrosive action upon the metal of the vane
c. the viscosity of the oil should not change with the temperature
d. all of the above
Q. Which of the following devices may be used for extending the range ofinstruments ?
a. shunts
b. multipliers
c. current transformers
d. all of the above
Q. For handling greater currents induction wattmeters are used inconjunction with
a. potential transformers
b. current transformers
c. power transformers
d. either of the above
Q. The pointer of an indicating instrument should be
a. very light
b. very heavy
c. either (a) or (b)
d. neither (a) nor (b)
Q. In majority of instruments damping is provided by
a. fluid friction
b. spring
c. eddy currents
d. all of the above