Electrostatics Practice Questions with Solutions – Electrical Engineering (Page 5)

#81📘 EE Pocket Reviewer RojasEasy

What is the power absorbed by a pure capacitor?

AMaximum

BMinimum

CNothing

DEither A or B, depending on voltage applied

#82📘 EE Pocket Reviewer RojasEasy

Let: D = electric flux density; E = electric field intensity. What is the formula to solve the absolute permittivity of the dielectric material?

ADE

BE/D

CD × E

DD/E

#83📘 EE Pocket Reviewer RojasEasy

Which one is equal to one farad?

ACoulomb per volt

BVolt per coulomb

CVolt per joule

DJoule per volt

#84📘 EE Pocket Reviewer RojasEasy

What happens to the field strength of an electric field if a dielectric is placed on the field?

ANothing

BIt will increase

CIt will decrease

DIt will become zero

#85📘 EE Pocket Reviewer RojasEasy

In making a capacitor, which property of a dielectric is best considered?

ALow permittivity

BHigh permittivity

CPermittivity equal to that of air

DPermittivity slightly higher than that of air

#86📘 EE Pocket Reviewer RojasEasy

Which of the following dielectric will make the lowest value of capacitance?

APaper

BMica

CCeramic

DAir

#87📘 EE Pocket Reviewer RojasEasy

Which one is stored in a capacitor?

AVoltage

BCharge

CCurrent

DPower

#88📘 EE Pocket Reviewer RojasEasy

Which is the main advantage of air as a dielectric ____ material for capacitors?

AIt has low loss

BIt is not physically dense

CIt has a high dielectric constant

DIt allows a large capacitance in a small volume

#89📘 EE Pocket Reviewer RojasEasy

Which of the following is often the source of static electricity?

APressure

BHeat

CMagnetism

DFriction

#90📘 EE Pocket Reviewer RojasEasy

As the spacing between plates in a capacitor is made smaller, all other things being equal ____

AThe capacitance increases

BThe capacitance decreases

CThe capacitance does not change

DThe resistance increases

#91📘 EE Pocket Reviewer RojasEasy

What happens to the current on a capacitor when the capacitor is being charged?

AIt will increase

BIt remains constant

CIt will decrease

DThe current is unpredictable

#92📘 EE Pocket Reviewer RojasEasy

A gang condenser used in a radio is what type of capacitors?

AAir capacitor

BPaper capacitor

CCeramic capacitor

DElectrolytic capacitor

#93📘 EE Pocket Reviewer RojasEasy

When capacitors are connected in series, the total capacitance is

AGreater than the largest capacitance

BSmaller than the smallest capacitance

CSmaller than the largest capacitance but greater than the smallest capacitance

DGreater than the smallest capacitance but smaller than the largest capacitance

#94📘 EE Pocket Reviewer RojasEasy

What do you mean by a variable capacitor?

AIts capacitance changes with temperature

BIts capacitance can be changed by changing its dielectric

CIts capacitance can be changed by mechanical means

DIts capacitance changes when voltage is changed

#95📘 EE Pocket Reviewer RojasEasy

Let: C = capacitance, V = voltage and Q = charge. Which of the following formulas is used to solve the energy stored in the capacitor?

ACV

B\(C^2V\)

C2QV

D\(\tfrac{1}{2}CV^2\)

#96📘 EE Pocket Reviewer RojasEasy

Which of the following types of capacitors is marked for polarity?

ACeramic

BPaper

CMylar

DElectrolytic

#97📘 EE Pocket Reviewer RojasEasy

Which of the following types of by-pass capacitors work well at high frequency?

AElectrolytic

BMica

CCeramic

DPaper

#98📘 EE Pocket Reviewer RojasEasy

To test a capacitor which is suspected to be shorted, it is connected in series with a 24 V test lamp and the series combination is connected across a 24 V dc source. If the capacitor is really shorted what happens to the lamp?

AIt will not light

BIt will light normally

CIt will light on and off

DIt will light but a little bit darker

#99📘 EE Pocket Reviewer RojasEasy

A capacitor is an electrical device consisting of two parallel

AInsulators

BDielectrics

CConductors

DSemi-conductors

#100📘 EE Pocket Reviewer RojasEasy

Which one is considered the disadvantage of using the electrolytic type capacitors?

AIt has low insulation resistance and applicable only to dc circuits

BIt has high insulation resistance and applicable only to ac circuits

CIt has high capacitance and low insulation resistance

DIt has high capacitance and high insulation resistance

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