Top 150+ Solved Electromagnetic Interference MCQ Questions Answer
Q. Which of the following bridge is frequency sensitive:
a. wheatstone bridge
b. maxwell bridge
c. anderson bridge
d. wien bridge
Q. The size of the earth or ground wire is based on the:
a. maximum fault current carrying through the ground wire
b. rated current carrying capacity of the service line
c. depends on the soil resistance
d. both (a) and (c)
Q. Generally grounding is provided for:
a. only for the safety of the equipment
b. only for the safety of the operating personnel
c. both (a) and (b)
d. none of the above
Q. Ground resistance should be designed such that:
a. grounding resistance should be as low as possible
b. grounding resistance should be as high as possible
c. grounding resistance should be always zero
d. none of the above
Q. The objective of earthing or grounding is:
a. to provide as low resistance possible to the ground
b. to provide as high resistance possible to the ground
c. to provide flow of positive, negative and zero sequence currents
d. none of the above
Q. The vale of resistance of an earthing electrode depends upon
a. shape and material of the electrode
b. depth to which electrode is driven into earth
c. specific resistance of soil
d. all of the above.
Q. A bridge circuit works at a frequency of 2KHz, the following can be used asdetectors for detection of null conditions in the bridge:
a. vibration galvanometers and headphones
b. headphones and tunable amplifiers.
c. vibration galvanometers and tunable amplifiers.
d. vibration galvanometers, headphones and tunable amplifiers.
Q. Maxwell’s inductance capacitance bridge is used for measurement ofinductance of:
a. low q coils
b. medium q coils
c. low and medium q coils
d. none of the above.
Q. The wheatstone bridge cant be used for precision measurements becauseerrors are introduce into on account of :
a. resistance of connecting leads
b. thermo electric emf
c. contact resistances
d. all of the above.
Q. High resistances are provided with a guard terminal. This guard terminal isused to :
a. bypass leakage current
b. guard the resistance against stray electrostatic fields
c. guard the resistance against over loads.
d. none of the above.
Q. A potentiometer may be used for
a. measurement of resistance
b. measurement of current
c. calibration of voltmeter
d. all of the above
Q. --------- is an instrument which measures the insulation resistance of anelectric circuit relative to earth and one another,
a. tangent galvanometer
b. meggar
c. current transformer
d. none of the above