Electromagnetic Theory MCQs | Electromagnetic Theory Multiple Choice Questions and Answers

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Questions
1 For Making A Capacitor, It Is Better To Select A Dielectric Having
A High Permittivity
B Low Permittivity
C Permittivity Slightly More Than That Of Air
D Permittivity Same As That Of Air

Answer: High Permittivity
2 The Electric Field At A Point Situated At A Distance D From Straight Charged Conductor Is
A Inversely Proportional To D
B Inversely Proportional To D
C Proportional To D
D None Of The Above

Answer: Inversely Proportional To D
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3 The Lines Of Force Due To Charged Particles Are
A Always Curved
B Always Straight
C Sometimes Curved
D None Of The Above

Answer: Always Curved
4 Which Of The Following Statement Is True ?
A The Current In The Discharging Capacitor Decays Exponentially
B The Current In The Discharging Capacitor Grows Linearly
C The Current In The Discharging Capacitor Decreases Constantly
D The Current In The Dicharging Capacitor Grows Exponentially

Answer: The Current In The Dicharging Capacitor Grows Exponentially
5 In A Capacitor The Electric Charge Is Stored In
A Dielectric
B Metal Plates
C Both (A) And (B)
D None Of The Above

Answer: Dielectric
6 Which Of The Following Capacitors Will Have The Least Variation ?
A Silver Plated Mica Capacitor
B Ceramic Capacitor
C Paper Capacitor
D None of these

Answer: Silver Plated Mica Capacitor
7 Which Of The Following Statements Is Incorrect ?
A A Wire Cable Has Distributed Capacitance Between The Conductors
B The Stored Energy In A Capacitor Increases With Applied Voltage
C The Leakage Resistance Of Ceramic Capacitors Is Generally High
D The Stored Energy In A Capacitor Decreases With Reduction In Value Of Capacitance

Answer: The Stored Energy In A Capacitor Decreases With Reduction In Value Of Capacitance
8 The Sparking Between Two Electrical Contacts Can Be Reduced By Inserting A
A Resistance In Line
B Capacitor In Series With Each Contact
C Sea erosion
D None Of The Above

Answer: Capacitor In Parallel With Contacts
9 When A Dielectric Slab Is Introduced In A Parallel Plate Capacitor, The Potential Difference Between Plates Will
A Decrease
B Increase
C Remain Uncharged
D Become Zero

Answer: Decrease
10 Capacitance Increases With
A Reduction In Plate Area And Distance Between The Plates
B Increase In Plate Area And Decrease In Distance Between The Plates
C Decrease In Plate Area And Value Of Applied Voltage
D Increase In Plate Area And Distance Between The Plates

Answer: Increase In Plate Area And Decrease In Distance Between The Plates
11 The Absolute Permittivity Of Free Space Is Given By
A 8.854 X 1(T10 F/M)
B 8.854 X 10"12 F/M
C 8.854 X 1(T9 F/M)
D None

Answer: 8.854 X 1(T10 F/M)
12 The Capacitor Preferred For High Frequency Circuits Is
A Mica Capacitor
B Electrolytic Capacitor
C Air Capacitor
D None Of The Above

Answer: Mica Capacitor
13 Which Capacitor Will Be Physically Smaller For The Same Ratings ?
A Paper Capacitor
B Ceramic Capacitor
C Both Will Be Of Equal Size
D None of these

Answer: Ceramic Capacitor
14 A Capacitor Consists Of Two
A Conductors Separated By An Insulator
B Silver-Coated Insulators
C Ceramic Plates And One Mica Disc
D Insulators Separated By A Dielectric

Answer: Conductors Separated By An Insulator
15 Dielectric Strength Of A Material Depends On
A Thickness
B Moisture Content
C Temperature
D All Of The Above

Answer: All Of The Above
16 The Capacitance Between Two Plates Increases With
A Larger Plate Area, Longer Distance Between Plates And Higher,Applied Voltage
B Larger Plate Area And Shorter Distance Between Plates
C Shorter Plate Area And Higher Ap¬Plied Voltage
D Shorter Plate Area And Shorter Dis¬Tance Between Them

Answer: Larger Plate Area And Shorter Distance Between Plates
17 The Bridge Used For The Measurement Of The Value Of The Capacitance Is
A Schering Bridge
B Wien's Bridge
C Wheatstone Bridge
D Hay's Bridge

Answer: Schering Bridge
18 73. The Presence Of An Uncharged Conductor Near A Charged One Increases The
A Potential Of The Charged Conductor
B Charge Of The Charged Conductor
C Capacity Of The Charged Conductor
D All Of The Above

Answer: Capacity Of The Charged Conductor
19 For A Good 0.05 Uf Capacitor Ohmmeter Reading Should
A Show High Resistance Momentarily And Then A Very Low Resistance
B Go Quickly To 50 Ohm Approximately And Remain There
C Show Low Resistance Momentarily And Back Off To A Very High Resis¬Tance
D Not Move At All

Answer: Show Low Resistance Momentarily And Back Off To A Very High Resis¬Tance
20 Which Of The Following Statements Is Correct ?
A Electrolytic Capacitors Must Be Connected In Correct Polarity
B Ceramic Capacitors Must Be Con¬Nected In Correct Polarity
C Mica Capacitors Are Available In Capacitance Values Of 5 To 20 \If
D Air Capapitors Have A Black Band To Indicate The Outside Foil

Answer: Electrolytic Capacitors Must Be Connected In Correct Polarity
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