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Free download in PDF Electromagnetic Theory Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(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
(3)
The Lines Of Force Due To Charged Particles Are
[A]
Always Curved
[B]
Always Straight
[C]
Sometimes Curved
[D]
None Of The Above
(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
(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
(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
(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
(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
(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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