A capacitor consists of two
Conductors only
Dielectric only
Conductors separated by a dielectric
Dielectric separated by a conductor
Correct Answer :
C. Conductors separated by a dielectric
Related Questions
If a capacitor is rated for 200V dca what is its effective ac working voltage?
50 V
100 V
200 V
400 V
In a series RLCcircuit
The current lags VLby 90�
The current leads VLby 90�
XL leads Xcby 90�
Z = jXL at resonance
An open inductor has
Zero resistance and infinite inductance
Infinite resistance and zero inductance
Infinite resistance and infinite inductance
Zero resistance and zero inductance
The reason why electrical appliances are connected in parallel.
It is a simple circuit
This makes the operation of appliances independent with each other
This results in reduced power consumption
All of the above
Why are inductance and capacitance not relevant in a dc circuit?
Because it is a simple circuit
Because dc circuits require only resistance as load
Because they do not exist in a dc circuit
Because frequency of dc is zero
Refers specifically to steady state values of quantities in ac circuits which are complex numbers.
Domain
Scalar quantity
Vector quantity
Phasor quantity
Norton�s theorem is ____ Thevenin�s theorem.
The same as
The converse of
Older that
More accurate than
What is the rms value of a square wave?
Equals its peak value
Equals its peak-to-peak value
Peak divided by square root of two
Peak divided by pi
When two coils of identical reactance are in parallel without mutual inductancea the reactance of the combination is ___ the reactance of each coil.
One half
Twice
Four times
One fourth
In a series circuit with unequal resistances the
Highest R has the highest V
Lowest R has the highest V
Lowest R has the highest I
Highest R has the highest I
The unit of elastance is
Farad
Daraf
Siemen
Henry
For a carbon composition resistora typical resistance values range from
2.7 to 22 M
1000 to 10000
10 to 10 M
2.7 to 2.7G
A capacitor consists of two
Conductors only
Dielectric only
Conductors separated by a dielectric
Dielectric separated by a conductor
The ratio of the flux density to the electric field intensity in the dielectric is called
Permittivity
Field intensity
Permeability
Elasticity
What capacitance exists not through design but simply because two conducting surfaces are relatively close to each other?
Surge
Stray
Natural
Normal
The hot resistance of an incandescent lamp is about ___ times its cold resistance.
Which of the statements below is not true?
Current source is an active element
Resistor is a linear element
Voltage source is a passive element
Diode is a non-linear element
For a linear circuita ___ voltage or current is used to calculate average power.
Rms
Peak
Average
Instantaneous
What is considered as the most important value of a sine wave?
Effective value
Peak value
Average value
Instantaneous value
Which of the following is not a factor affecting dielectric strength?
Mass
Moisture content
Temperature
Thickness
A lead conductor has a resistance of 25 at 0 �C. Determine its resistance at -30 �C
Which of the following dielectric materials makes the highest-capacitance capacitor?
Air
Barium-strontium titanite
Mica
Electrolyte
In dividing or multiplying phasor quantitiesa ___ form is used.
Polar
Rectangular
Trigonometric
Exponential
When two unequal values of resistors are connected in parallel across a dc sourcea greater current flows through the
Higher resistance
Lower resistance
Higher wattage resistance
Lower wattage resistance
Under the conditions of maximum power transfera a voltage source is delivering a power of 15 W to the load. What is the power generated by the source?
60 W
30 W
15 W
4 W
A wire of one kilometre length has a resistance of 20 . If the length is halveda then the new resistance is ___ the original resistance.
Half
Twice
One-fourth
Three times
Voltage resonance means
Series resonance
Parallel resonance
Current magnification
Gain magnification
Which of the following describes the action of a capacitor?
Stores electrical energy
Opposes changes in current flow
Creates a dc resistance
Converts ac to dc
Which of the following represents the energy stored in a cap
CV2/2
2Q2/C
C2/V
CV
In an inductive coila the rate of rise of current is maximum
Near the final maximum value of current
At midvalue of current
At half-power points
After one time constant