Electromagnetic Interference Set 1

Electrical Engineering

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This set of Electromagnetic Interference Multiple Choice Questions & Answers (MCQs) focuses on Electromagnetic Interference Set 1

Q1 | Moving Iron instruments can be used on:
  • ac and dc both
  • ac only
  • dc only
  • none of the above
Answer: ac and dc both
Q2 | In spring control instruments, controlling torque:
  • can be adjusted easily
  • cannot be adjusted easily
  • remains the same
  • varies with the load
Answer: cannot be adjusted easily
Q3 | Chemical effect is used for the operation of:
  • voltmeter
  • ammeter
  • ampere hour meter
  • kwh meter
Answer: ampere hour meter
Q4 | The deflection torque can be produced by:
  • gravity control
  • spring control
  • air friction
  • magneitcally
Answer: magneitcally
Q5 | Moving coil instruments are:
  • permanent magnet type
  • dynamometer type
  • induction type
  • permanent magnet and dynamometer type
Answer: permanent magnet and dynamometer type
Q6 | For increasing the range of an ammeter, connect:
  • a high value resistance in series with the ammeter coil
  • a high value resistance in parallel with the ammeter coil
  • a low value resistance in parallel with the ammeter coil
  • a low value resistance in series with the ammeter coil
Answer: a low value resistance in parallel with the ammeter coil
Q7 | A galvanometer can be used for measuring current and voltage of a circuitby:
  • shunt only
  • connecting high value of resistance in series only
  • shunt for measuring current and high resistance in series for voltage
  • without shunt and series resistance
Answer: shunt for measuring current and high resistance in series for voltage
Q8 | The energy consumption of MI instrument as compared to MC instrument is:
  • same
  • more
  • less
  • very small
Answer: more
Q9 | An ammeter requires a change of 4A in its coil to produce a pointer deflectionof 8mm then its sensitivity is
  • 2.5 mm/a
  • 2.0 mm/a
  • 0.5 mm/a
  • none of the above
Answer: 2.0 mm/a
Q10 | Electrostatic type instruments are mainly used for measurement of
  • heavy currents
  • low currents
  • low voltages
  • high voltages
Answer: high voltages
Q11 | Measurement range of a voltmeter can be extended by using:
  • high current resistance
  • high series resistance
  • low shunt resistance
  • low series resistance
Answer: high series resistance
Q12 | Which of the following voltmeter have least power consumption:
  • moving iron
  • hot-wire
  • electrostatic
  • induction type
Answer: electrostatic
Q13 | Which of the following instruments have least torque/weight ratio:
  • dynamometer type
  • pmmc
  • attraction type moving iron
  • repulsion type moving iron
Answer: dynamometer type
Q14 | Fluid friction damping can be used in
  • horizontally mounted instruments
  • vertically mounted instruments
  • both horizontally mounted instruments and vertically mounted instruments
  • none of the above
Answer: vertically mounted instruments
Q15 | The ratio and phase angle errors in potential transformer may be reduced by
  • increasing the exciting current
  • increasing the resistance and leakage reactance in the transformer
  • by not employing turns compensation
  • none of the above
Answer: none of the above
Q16 | A voltmeter should have
  • . low internal resistance
  • . high internal resistance
  • . electrostatic plates
  • . a sensitive amplifier
Answer: . high internal resistance
Q17 | The major advantage of electromagnet type meter over a permanent magnetmeter is
  • . the electromagnet meter costs much less
  • the permanent magnet meter has a more sluggish coil
  • . the electromagnet meter need not be aligned with the earth’s magnetic field
  • . the electromagnet meter is more rugged
Answer: . the electromagnet meter is more rugged
Q18 | The change in the direction of a compass needle, when a current carrying wireis brought near, is called
  • . electromagnetic deflection
  • . electroscopic force
  • magnetic force
  • . electrostatic force
Answer: . electromagnetic deflection
Q19 | The use of _____ instruments is merely confined within laboratories asstandardizing instruments.
  • absolute
  • indicating
  • recording
  • integrating
Answer: absolute
Q20 | Which of the following instruments indicate the instantaneous value of theelectrical quantity being measured at the time at which it is being measured ?
  • absolute instruments
  • indicating instruments
  • recording instruments
  • integrating instruments
Answer: indicating instruments
Q21 | _____ instruments are those which measure the total quantity of electricitydelivered in a particular time.
  • absolute
  • indicating
  • recording
  • integrating
Answer: integrating
Q22 | Which of the following are integrating instruments ?
  • ammeters
  • voltmeters
  • wattmeters
  • ampere-hour and watt-hour meters
Answer: ampere-hour and watt-hour meters
Q23 | Which of the following essential features is possessed by an indicatinginstrument ?
  • deflecting device
  • controlling device
  • damping device
  • all of the above
Answer: all of the above
Q24 | A _____ device prevents the oscillation of the moving system andenables the latter to reach its final position quickly
  • deflecting
  • controlling
  • damping
  • any of the above
Answer: damping
Q25 | The spring material used in a spring control device should have thefollowing property.
  • should be non-magnetic
  • most be of low temperature co-efficient
  • should have low specific resistance
  • all of the above
Answer: all of the above
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