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This set of Electromagnetics Multiple Choice Questions & Answers (MCQs) focuses on Electromagnetics Set 8

Q1 | Calculate the energy in the 4F capacitor.
  • 128kj
  • 1.28kj
  • 12.8kj d) 1280j
Q2 | Calculate the energy stored in the combination of the capacitors.
  • 192kj
  • 1.92kj
  • 19.2kj
  • 1920j
Q3 | The unit for dielectric strength is
  • v/m2
  • mv/m2
  • mv/m
  • vm
Q4 | If the Voltage increases, what happens to dielectric strength?
  • increases
  • decreases
  • remains the same
  • becomes zero
Q5 | If the thickness of the material increases, what happens to the dielectric strength?
  • increases
  • decreases
  • remains the same
  • becomes zero
Q6 | Which medium has the highest dielectric strength?
  • water
  • mica
  • air
  • glass
Q7 | Leakage in capacitors is primarily caused by
  • transistors
  • resistors
  • inductors
  • dc motors
Q8 | What is the conduction current when a capacitor is fully charged?
  • infinity
  • zero
  • 100a d) 1000a
Q9 | The flow of electrons in dielectric is due to
  • conduction
  • potential difference
  • breakdown
  • resistance
Q10 | The flow of electrons which does not pass through the battery is known as
  • displacement current
  • leakage current
  • either displacement or leakage current
  • neither displacement nor leakage current
Q11 | The free electrons in practical dielectrics is due to _
  • there are no free electrons
  • conductors
  • impurities
  • both conductors and impurities
Q12 | What is the type of current where the electrons actually move?
  • displacement current
  • conduction current
  • both conduction and displacement current
  • neither conduction nor displacement current
Q13 | What is the type of current caused due to variations in the field?
  • displacement current
  • conduction current
  • both conduction and displacement current
  • neither conduction nor displacement current
Q14 | Under normal conditions capacitors have _
  • displacement current
  • conduction current
  • both conduction and displacement current
  • neither conduction nor displacement current
Q15 | Under normal conditions capacitors have _
  • displacement current
  • conduction current
  • both conduction and displacement current
  • neither conduction nor displacement current
Q16 | What is the unit for displacement current?
  • no unit
  • ampere
  • coulomb
  • ampere/coulomb
Q17 | Displacement current depends on _
  • moving charges
  • change in time
  • both moving charges and change in time
  • neither moving charges nor change in time
Q18 | Magnetic fields between the parallel plates of a capacitor are due to?
  • displacement current
  • conduction current
  • both conduction and displacement current
  • neither conduction nor displacement current
Q19 | The free electrons in practical dielectrics are due to                  
  • there are no free electrons
  • conductors
  • impurities
  • displacement currents
Q20 | Paper capacitor is a type of _
  • fixed capacitor
  • variable capacitor
  • either fixed or variable depending on its usage
  • neither fixed nor variable
Q21 | A capacitor using chemical reactions to store charge is _
  • paper capacitor
  • ceramic capacitor
  • polyester capacitor
  • electrolyte capacitor
Q22 | Which, among the following, is the odd one out?
  • ceramic capacitor
  • electrolyte capacitor
  • tuning capacitor
  • paper capacitor
Q23 | In a variable capacitor, capacitance can be varied by
  • turning the rotatable plates in or out
  • sliding the rotatable plates
  • changing the plates
  • changing the material of plates
Q24 | The simplest kind of capacitor is _
  • ceramic capacitor
  • electrolyte capacitor
  • tuning capacitor
  • paper capacitor
Q25 | Capacitor preferred when there is high frequency in the circuits is _
  • electrolyte capacitor
  • mica capacitor
  • air capacitor
  • glass capacitor