# 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
• 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
• 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 ________

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 __________

• 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 __________

• 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