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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