Capacitors mcqs 200+

Capacitors mcqs

Q1) ___________ stores charge?

  • Capacitors
  • Resistors
  • Both a and b
  • None of the above

Q2) The unit of capacitance is………………………

  • Volts/coulomb
  • Coulombs/volt
  • Henry/wb
  • Ohms

Q3) The discharge time of the battery is ________

  • 0.1 to 1hr
  • 0.1 to 5hr
  • 0.03 to 3hr
  • 0.09 to 1hr

Q4) The nominal capacitance of the paper capacitors is around ________

  • 0.1uF to 10uF
  • 0.01uF to 10uF
  • 0.001uF to 10uF
  • 0.5uF to 10uF

Q5) The capacitance of a capacitor is not affected by …………………..

  • Distance between plates
  • Area of plates
  • Thickness of plates
  • All of the above

Q6) The working voltage of the paper capacitors is around ________

  • 100v to 200v
  • 200v to 300v
  • 300v to 600v
  • 200v to 600v

Q7) The typical tolerance of the paper capacitors is ________

  • 2%
  • 4%
  • 6%
  • 10%

Q8) The temperature coefficient of the paper capacitors is ________

  • ±100 deg/c
  • ±400 deg/c
  • ±800 deg/c
  • ±1000 deg/c

Q9) The disadvantage of the paper capacitor is _______

  • Size
  • Suspectible and hygroscopic to moisture
  • Both a and b
  • None of the above

Q10) The advantage of the paper capacitor is _______

  • Low cost
  • Voltage rating is high
  • Stable
  • All of the above

Q11) The dissipation factor of paper capacitors is _____

  • 1%
  • 4%
  • 6%
  • 10%

Q12) The dielectric absorption of paper capacitors is __________

  • 2.5%
  • 4%
  • 6%
  • 10%

Q13) How many conductors does the capacitor consist of ?

  • One
  • Two
  • Three
  • Four

Q14) The capacitance measured in ______

  • Watts
  • Henry
  • Farads
  • None of the above

Q15) The dielectric materials increase the ________

  • Capacitance
  • Resistivity
  • Both a and b
  • None of the above

Q16) Capacitor obey _________ law

  • Coulombs
  • Ohms law
  • Kirchhoffs law
  • All of the above

Q17) The relationship between frequency, capacitance, and capacitor reactance is given by _____

  • Capacitance reactance=1/2πfc
  • Capacitance reactance=1/2πf
  • Capacitance reactance=1/2fc
  • Capacitance reactance=1/4πfc

Q18) The capacitors categorized into _______ groups

  • One
  • Two
  • Three
  • Four

Q19) Which one is a polarized capacitor?

  • Electrolytic capacitor
  • Ceramic capacitor
  • Silver capacitor
  • Teflon capacitor

Q20) Which one is a non-polarized capacitor?

  • Polystyrene capacitor
  • Ceramic capacitor
  • Teflon capacitor
  • All of the above

Q21) _________ are the dielectric materials

  • Air or Vaccum
  • Rubber, oil, paper
  • Mica, glass, ceramic
  • All of the above

Q22) What is the standard unit of electric charge?

  • Watts
  • Henry
  • Farads
  • Coulombs

Q23) To store the electric charge the ultra-capacitors uses ______ effect

  • Single layer
  • Double layer
  • Both a and b
  • None of the above

Q24) The advantages of ultra-capacitors are _______

  • Long life
  • Transient response is fast
  • Efficiency is high
  • All of the above

Q25) The capacitance range of supercapacitors is from ________

  • 100 farad to 5000 farad
  • 200 farad to 5000 farad
  • 300 farad to 5000 farad
  • 400 farad to 5000 farad

Q26) The supercapacitors are also known as ________

  • Ultracapacitors
  • Electrical double-layer capacitors
  • Ultra or electrical double-layer capacitors
  • None of the above

Q27) The hybrid capacitors are categorized into ______

  • One
  • Two
  • Three
  • Four

Q28) The conducting polymers and metal oxides are ____________ capacitors

  • Hybrid
  • Double layer
  • Pseudo
  • None of the above

Q29) The activated carbons, carbon nanotubes, carbon aerogels are _______ type of capacitors

  • Hybrid
  • Double layer
  • Pseudo
  • None of the above

Q30) The disadvantages of supercapacitors are ________

  • Cost is high
  • Have a high self-discharge rate
  • Cannot be used in AC and high-frequency circuits
  • All of the above

Q31) Which one is a variable capacitor?

  • Ceramic trimmer capacitor
  • Air gap capacitor
  • Vaccum capacitor
  • All of the above

Q32) Which one is a type of miscellaneous capacitor?

  • Supercapacitors
  • Air gap capacitors
  • Hybrid capacitors
  • All of the above

Q33) The supercapacitors are categorized into __________

  • One
  • Two
  • Three
  • Four

Q34) Which one is a film-based capacitor?

  • Metalized paper power capacitor
  • Paper film/foil power capacitor
  • PP film/foil power capacitor
  • All of the above

Q35) The minimum film thickness of polyester is ___

  • 0.1-0.9µm
  • 0.2-0.9µm
  • 0.4-0.9µm
  • 0.7-0.9µm

Q36) The minimum film thickness of polyethylene sulfide is ___

  • 0.1µm
  • 0.2µm
  • 1.2µm
  • 0.7µm

Q37) The minimum film thickness of polyethylene naphthalate is ___

  • 0.1-0.9µm
  • 0.2-0.9µm
  • 0.4-0.9µm
  • 0.9-1.4µm

Q38) The capacitance range of polyester is ____________

  • 100PF to 22µF
  • 100PF to 2µF
  • 100PF to 32µF
  • 100PF to 42µF

Q39) The dielectric constant of air is ________

  • Unity
  • One
  • Zero
  • Infinity

Q40) The capacitance range of polyethylene naphtholate is ____________

  • 100PF to 22µF
  • 100PF to 1µF
  • 100PF to 32µF
  • 100PF to 42µF

Q41) The capacitance range of polypropylene is ____________

  • 100PF to 22µF
  • 100PF to 10µF
  • 100PF to 0.47µF
  • 100PF to 42µF

Q42) The dielectric strength of polyester is ________

  • 580V/µm
  • 780V/µm
  • 880V/µm
  • 980V/µm

Q43) The dielectric strength of polyethylene napthalate is ________

  • 500V/µm
  • 780V/µm
  • 880V/µm
  • 980V/µm

Q44) The dielectric strength of polyphenylene sulfide is ________

  • 470V/µm
  • 780V/µm
  • 880V/µm
  • 980V/µm

Q45) The dielectric strength of polypropylene is ________

  • 470V/µm
  • 780V/µm
  • 650V/µm
  • 980V/µm

Q46) The electrolytic capacitors are categorized into _______ families according to their dielectric

  • One
  • Two
  • Three
  • Four

Q47) The ____________ capacitors are fixed capacitors

  • Non-polarized
  • Polarized
  • Both a and b
  • None of the above

Q48) Niobium oxide capacitor is a type of ________ capacitor

  • Solid electrolyte
  • Polyester
  • Pseudo
  • None of the above

Q50) Which capacitor do stores charge electrochemically?

  • Double-layer capacitors
  • Pseudo capacitors
  • Hybrid capacitors
  • All of the above

Q51) The polyester capacitors are categorized into ________ types

  • One
  • Two
  • Three
  • Four

Q52) The maximum capacitor value of super capacitor is ________

  • 5000F
  • 10000F
  • 1200F
  • 12000F

Q53) Which type of energy does the capacitor store?

  • Kinetic
  • Potential
  • Both a and b
  • None of the above

Q54) After long time capacitor blocks ________

  • DC
  • AC
  • Both a and b
  • None of the above

Q55) The DC voltage range of polyester is _______

  • 10-50V
  • 20-50V
  • 50-100V
  • 50-1000V

Q56) The DC voltage range of polyethylene napthalate is _______

  • 10-50V
  • 20-50V
  • 50-100V
  • 16-250V

Q57) The DC voltage range of polypropylene is _______

  • 10-50V
  • 16-100V
  • 50-100V
  • 50-1000V

Q58) The DC voltage range of polyphenylene sulfideis _______

  • 40-2000V
  • 16-250V
  • 50-100V
  • 50-1000V

Q59) Which capacitor do stores charge electro statically?

  • Double-layer capacitors
  • Pseudo capacitors
  • Hybrid capacitors
  • All of the above

Q60) ______ is a passive device

  • Capacitor
  • Transistor
  • Both a and b
  • None of the above

Q61) The metals have _________

  • Low capacitance
  • High capacitance
  • High resistivity
  • None of the above

Q62) In transistor circuits _________ capacitors are used

  • Ceramic
  • Air
  • Hybrid
  • None of the above

Q63) Which capacitor do stores charge electrochemically and electro-statically?

  • Double-layer capacitors
  • Pseudo capacitors
  • Hybrid capacitors
  • All of the above

Q64) _________ capacitors are used for tuning, radiofrequency coupling, and audio frequency

  • Mica
  • Air
  • Ceramic
  • None of the above

Q65) ___________ capacitors are used in communication transmitters.

  • Electrolyte
  • Variable
  • Air
  • None of the above

Q66) The value range of ceramic capacitors is from __________

  • Few picofarads to 0.1 microfarads
  • Few picofarads to 3 microfarads
  • Few picofarads to 10 microfarads
  • None of the above

Q67) The features of micro capacitors are _______

  • Low tolerance
  • Very accurate
  • Low resistive inductive losses
  • All of the above

Q68) Why does capacitor block dc signal at steady state?

  • due to high frequency of dc signal
  • due to zero frequency of dc signal
  • capacitor does not pass any current at steady state
  • due to zero frequency of dc signal

Q69) The features of ceramic capacitors are ______

  • Low capacitance per unit volume
  • Low loss factor
  • Reasonable level of stability
  • All of the above

Q70) The features of paper capacitors are _________

  • Low capacitance
  • High working voltage and current
  • High leakage rates
  • All of the above

Q71) The features of thin-film capacitors ___________

  • High stability, low cost
  • Low losses even at high frequencies
  • Long shelf life
  • All of the above

 Q72) If a parallel plate capacitor of plate area 2m2 and plate separation 1m store the charge of 1.77*10-11 C. What is the voltage across the capacitor? hint C=€0A/d

  • 1V
  • 2V
  • 3V
  • 4V

Q73) The frequency of electrolytic capacitor are ________

  • Limited frequency response
  • High capacitance and voltage ranges are available
  • High leakage current and aging
  • All of the above

Q74) The tantalum _________

  • Allows large current to pass
  • Reliable and stable over time
  • Both a and b
  • None of the above

Q75) Capacitor is a device used to__________

  • store electrical energy
  • vary the resistance
  • store magnetic energy
  • dissipate energy

 Q76) What is the value of capacitance of a capacitor which has a voltage of 4V and has 16C of charge hint (C=Q/V= 16/4=4F )

  • 2F
  • 4F
  • 6F
  • 8F

Q77) The charging time of super capacitors is _______

  • 1-2seconds
  • 2-5seconds
  • 1-8seconds
  • 1-10seconds

Q78) The service life of supercapacitors is _______

  • 1-2seconds
  • 2-5seconds
  • 10-15seconds
  • 1-10seconds

Q79) The capacitors used in _________

  • Energy storage systems
  • Signal processing devices
  • Filter applications
  • All of the above

Q80) Based on the dielectric materials the SMD capacitors categorized into ______ types

  • One
  • Two
  • Three
  • Four

Q81) The advantages of SMD capacitors are __________

  • Small in size
  • Less cost
  • High performance
  • All of the above

Q82) For which medium capacitance is high?

  • Air
  • Mica
  • Water
  • Metal

Q83) The disadvantages of SMD capacitors are ________

  • Low heat capacity
  • Due to its size the manual operation is difficult
  • Both a and b
  • None of the above

Q84) What is the standard form of SMD capacitor?

  • Simple Multilayer Device
  • Surface Multilayer Device
  • Surface Mount Device
  • None of the above

Q85) The ceramic capacitors used in _________

  • Printed circuit boards
  • Transmitter stations
  • Power circuit breakers
  • All of the above

Q86) The polyester capacitors used in __________

  • DC applications
  • Small size
  • Most cost-effective
  • All of the above

Q87) The temperature coefficient of PET capacitor is _________

  • ±1.0%
  • ±2.0%
  • ±4.0%
  • ±5.0%

Q88) The temperature coefficient of X7R is _________

  • ±1.0%
  • ±12.0%
  • ±14.0%
  • ±15.0%

Q89) The dielectric absorption of PET capacitor is ________

  • ±1.0%
  • ±12.0%
  • 0.5%
  • ±15.0%

Q90) The dielectric strength of barium titanate is ___________

  • 2-10Kv/mm
  • 4-10Kv/mm
  • 6-10Kv/mm
  • 8-10Kv/mm

Q91) The dielectric strength of paper is ___________

  • 10Kv/mm
  • 14Kv/mm
  • 60Kv/mm
  • 80Kv/mm

Q92) The dielectric strength of glass is ___________

  • 10Kv/mm
  • 15Kv/mm
  • 60Kv/mm
  • 80Kv/mm

  Q93) The capacitance between two plates increases with

  • Shorter plate area and higher applied voltage
  • Shorter play area and shorter distance between them
  • Larger plate area, longer distance between plates and higher applied voltage
  • Larger plate area and shorter distance between plates

Q94) The dielectric strength of mica is ___________

  • 63Kv/mm
  • 15Kv/mm
  • 60Kv/mm
  • 80Kv/mm

Q95) 100 PF is equal to ________

  • 0.1nF
  • 0.9nF
  • 0.10nF
  • 0.8nF

Q96) 1000 PF is equal to ________

  • 1nF
  • 0.9nF
  • 0.10nF
  • 0.8nF

Q97) Which one is a type of film capacitor?

  • Aluminum
  • Tantalum
  • Axial style
  • None of the above

Q98) 100 nF is equal to ________

  • 1µF
  • 0.1µF
  • 0.10µF
  • 0.8µF

Q99) The relative permittivity is defined as the ratio of _____________

  • Electric flux density divided by electric field strength
  • FalseElectric field strength divided by electric flux density
  • Electric field strength divided by dielectric flux density
  • None of the above

Q100) The paper capacitors used in ______ applications

  • High current
  • High voltage
  • Both a and b
  • None of the above

Q101) The nominal capacitance range of niobium electrolyte capacitor is _______

  • 1uF to 1200uF
  • 1uF to 100uF
  • 1uF to 200uF
  • 1uF to 1500uF

Q102) The disadvantage of the niobium electrolytic capacitor is _____________

  • Low voltage rating
  • High operating losses
  • Both a and b
  • None of the above

Q103) The advantage of niobium electrolytic capacitor is _____________

  • Low cost
  • Reliable
  • High volumetric capacitance
  • All of the above

Q104) The nominal capacitance of tantalum electrolytic capacitor is from _______

  • 0.1uF to 1000uF
  • 0.9uF to 1000uF
  • 0.7uF to 1000uF
  • 0.8uF to 1000uF

Q105) The working voltage of tantalum electrolytic capacitor is from _______

  • 3V to 100V
  • 2V to 100V
  • 6V to 100V
  • 1V to 100V

Q106) Typical tolerance of tantalum electrolytic capacitor is _______

  • 5%
  • 10%
  • 18%
  • 20%

Q107) The nominal capacitance of an aluminum electrolytic capacitor is from _______

  • 0.1uF to 47000uF
  • 0.9uF to 1000uF
  • 0.7uF to 1000uF
  • 0.8uF to 1000uF

Q108) What is the standard form of EDLC?

  • Electrode Double Layer Capacitor
  • Electric Double Layer Capacitor
  • Electric/electrochemical Double Layer Capacitor
  • None of the above

Q109) The electric/electrochemical double-layer capacitor works on _______ layer capacitance principle

  • Single
  • Double
  • Both a and b
  • None of the above

Q110) The electrolyte is used as a ______ in electrolyte capacitors

  • Conductor
  • Insulator
  • Isolator
  • None of the above

Q111) The coulombic efficiency of the capacitor is about _______

  • 10%
  • 20%
  • 50%
  • 100%

Q112) The coulombic efficiency of the super capacitor is _______

  • 10%
  • 20%
  • 50%
  • 99%

Q113) The coulombic efficiency of the battery is about _______

  • 10%
  • 20%
  • 70-80%
  • 99%

Q114) The charge storage determinants of the capacitor is _______

  • Electrode area and dielectric
  • Microstructure of electrode and electrolyte
  • Thermodynamics and active mass
  • None of the above

Q115) The charge storage determinants of the super capacitor are _______

  • Electrode area and dielectric
  • Microstructure of electrode and electrolyte
  • Thermodynamics and active mass
  • None of the above

Q116) The charge storage determinants of battery is _______

  • Electrode area and dielectric
  • Microstructure of electrode and electrolyte
  • Thermodynamics and active mass
  • None of the above

Q117) The charge time of the battery is ________

  • 0.1 to 1hr
  • 1 to 5hr
  • 0.03 to 3hr
  • 0.09 to 1hr

Q118) What is the standard form of GCD?

  • Galvanostatic Charge/Discharge
  • Galvanostatic Capacitor Discharge
  • Galvanostatic Discharge
  • None of the above

Q119) The charge time of lithium-ion is _________

  • 10-20minutes
  • 10-40minutes
  • 10-50minutes
  • 10-60minutes

Q120) The cell voltage of lithium-ion is _________

  • 2 to 5V
  • 2 to 9V
  • 3.6 to 3.7V
  • 2 to 15V

Q121) The cell voltage of super capacitor is _________

  • 2 to 5V
  • 2.3 to 2.7V
  • 3.6 to 3.7V
  • 2 to 15V

Q122) The service life of lithium-ion is ______

  • 5 years
  • 10 years
  • 15years
  • 5-10years

Q123) The advantages of polystyrene capacitor is _________

  • Low leakage
  • Low distortion
  • High insulation
  • All of the above

Q124) The disadvantages of polystyrene capacitor is _________

  • Not heat resistance
  • Good temperature stability
  • Low dielectric absorption
  • All of the above

Q125) The dielectric constant value of polystyrene capacitors is _______

  • 1-2
  • 2.5-2.6
  • 3-4
  • 4-5

Q125) The working voltage of niobium electrolytic capacitor is from _________

  • 1V to 10V
  • 10V to 16V
  • 1V to 19V
  • 1V to 20V

Q126) The dielectric constant value of mica capacitors is _______

  • 1-2
  • 6
  • 3-4
  • 4-5

Q127) The mica capacitors categorized into _________ types

  • One
  • Two
  • Three
  • Four

Q128) The properties of mica capacitor are __________

  • High accuracy
  • High Q
  • Temperature coefficient
  • All of the above

Q129) Which one is used as a dielectric in silver mica capacitor?

  • Silver
  • Mica
  • Both a and b
  • None of the above

Q130) The characteristics of mica capacitors are ________

  • Low losses
  • Stability
  • Accuracy and tolerance
  • All of the above

Q131) The capacitors _______

  • Stops DC
  • Allows AC to pass
  • Stores voltage in the form of the dielectric field
  • All of the above

Q132) The capacitance range of polyethylene sulfide is ____________

  • 100PF to 22µF
  • 100PF to 1µF
  • 100PF to 0.47µF
  • 100PF to 42µF

Q133) The function of capacitor in a circuit is _______

  • Prevent the loss of information
  • AC/DC conversion, reactive power control
  • Electric charge storage
  • All of the above

Q134) The advantages of ceramic capacitor is _______

  • Available in both SMD and lead packages
  • Frequency performance is high
  • Cheap to manufacture
  • All of the above

Q135) In transistor circuits _______ capacitor is used

  • Mica
  • Paper
  • Ceramic
  • None of the above

Q136) The dielectric material in air gap trimmer capacitors is _____

  • SF6
  • Air
  • Mica
  • None of the above

Q137) The dielectric material in SF6 gas-filled tunning capacitors is _____

  • SF6
  • Air
  • Mica
  • None of the above

Q138) The dielectric material in glass capacitors is _____

  • SF6
  • Air
  • Glass
  • None of the above

Q139) The wet tantalum capacitors used in _______

  • Space
  • Avionics
  • Consumer applications
  • All of the above

Q140) Which one is used as dielectric in tantalum capacitors?

  • Niobium pentoxide
  • Manganese dioxide
  • Tantalum pentoxide
  • All of the above

Q141) In a capacitor, the relation between voltage and current is ______

  • I=C dv/dt
  • I=2C dv/dt
  • C=I dv/dt
  • None of the above

Q142) The capacitor act as short circuit for _________

  • Low frequencies
  • High frequencies
  • Both a and b
  • None of the above

Q143) The parallel metal plates of the capacitor separated by ________

  • Insulators
  • Isolators
  • Both a and b
  • None of the above

Q144) The capacitor act as an open circuit for _________

  • Low frequencies
  • High frequencies
  • Both a and b
  • None of the above

Q145) The capacitors ____________ in an exponential manner

  • Discharge and charge
  • Only charge
  • Only discharge
  • None of the above

Q146) When capacitors connected in series ______ remains same and _______ varies

  • Charge, voltage
  • Voltage, charge
  • Capacitance, reactance
  • None of the above

Q147) For _____________ charge the gauss law is applicable

  • Sheet charge
  • Point charge
  • Line charge
  • All of the above

Q148) The flux density increases when charge _____

  • Increases
  • Decreases
  • Constant
  • Varies

Q149) The ratio of actual to absolute permittivity is known as a _______ permittivity

  • Relative
  • Actual
  • Absolute
  • None of the above

Q150) When actual permittivity decreases the relative permittivity __________

  • Decreases
  • Increases
  • Constant
  • None of the above

Q151) If relative permittivity increases the absolute permittivity __________

  • Remains the same
  • Increases
  • Decreases
  • None of the above

Q152) There is no unit for the ____________ permittivity

  • Absolute
  • Relative
  • Actual
  • None of the above

Q153) While the capacitor is charging the final current of a capacitor is ________

  • One
  • Zero
  • Infinity
  • None of the above

Q154) While the capacitor is charging the initial current of a capacitor is very high

  • True
  • False

Q155) The mica capacitors used in __________

  • Radio or TV transmitters
  • Coupling circuits
  • Resonant circuits
  • All of the above

Q156) The capacitor acts as an ______ circuit at DC

  • Only open
  • Only close
  • Both open and close
  • None of the above

Q157) The aluminum electrolyte capacitors are not suitable for ________

  • Coupling
  • Decoupling
  • Attenuation
  • All of the above

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