Which of the following dielectric materials makes the lowest-capacitance capacitor?
Paper
Mica
Air
Electrolyte
Correct Answer :
C. Air
Related Questions
The factor 0.707for converting peak to rms applies only to
Square waves
Triangle waves
Sawtooth waves
Sine waves
Of the equivalent combination of unitsa which one is not equal to watt?
2/V
AV
A2
J/s
The average value of a triangular or sawtooth wave is _____ times its peak value.
In an ac circuita the power dissipated as heat depends on
Impedance
Capacitive reactance
Resistance
Inductive reactance
An impedance given by 90 -45� is a/an ___ impedance.
Inductive
Conductive
Resistive
Capacitive
What is the most convenient way of achieving large capacitance?
By using multiplate construction
By using air as dielectric
By decreasing distance between plates
By using dielectric of low permittivity
In a parallel bank with unequal branch resistances
The highest R has the highest I
The lowest R has the highest V
The lowest R has the highest V
The highest R has the highest V
A series RLCcircuit has a ______ power factor at its half-power points
Unity
Leading
Lagging
Either B or C
³Any resistance R in a branch of a network in which a current I is flowing can be replaced by a voltage equal to IR�. This states
Compensation theorem
Reciprocity theorem
Millman�s theorem
Superposition theorem
The temperature-resistance coefficient of pure gold is
Series resonant circuit is sometimes known as
Rejector circuit
Acceptor circuit
Inductive circuit
Capacitive circuit
An inductive circuit of resistance 16.5 and inductance of 0.14 H takes a current of 25 ?. if the frequency is 50 Hza find the supply voltage.
1501 V
1174V
1877V
991 V
A capacitor is basically constructed of
Two conductors separated by a dielectric
Two dielectric separated by a conductor
Conductors and dielectric
Conductors and semiconductors
Two capacitors of capacitance 9 F and 18 F in series will have a total capacitance of
27 F
162 F
6 F
180 F
In a rectangular wavea the form factor is
High resistance values are a consequence of the ___ of the film.
Thickness
Length
Thinness
Area
The usual load of a dc circuit is a/an
Resistor
Capacitor
Inductor
Both inductor and capacitor
When the movable plates of a gang capacitor completely overlap the fixed platesa the capacitance of the capacitor is
Halfway between maximum and minimum
Maximum
Minimum
Zero
The charge in the capacitor is stored at the
Terminals
Plates
Dielectric
Air
What refers to such work at very low temperaturesa near absolute zero?
Cryogenics
Superconductivity
Subsonic
Thermionic
What theorem is usually used in the analysis of transistor circuit?
Superposition theorem
Millman�s theorem
Thevenin�s theorem
Norton�s theorem
If the capacitance of mica capacitor is 5 times the capacitcitora then the relative permittivity of mica is
Tungsten filament of bulbs has a hot resistance higher than its cold resistance due to its temperature coefficient which is
Positive
Negative
Zero
Infinite
What is the total effective capacitance of two 0.25 F capacitors connected in series?
0.125 F
1.25 F
0.50 F
2.5 if
The power factor of a certain circuit in which the voltage lags behind the current is 80 %. To increase the power to 100 %a it is necessary to add ___ to the circuit.
Inductance
Capacitance
Resistance
Impedance
In a circuita a passive element is one which
Supplies energy
Receives energy
Both supplies and receives energy
Attenuates signal
In a pure capacitancea
Current leads voltage by 90�
Current leads voltage by 180�
Current lags voltage by 90�
Current lags voltage by 180�
Two complex numbers or phasors are said to be conjugate if they
Differ only in the algebraic sign of their quadratic components
Differ only in the algebraic sign of their real components
Are equal in their real and quadrature components including alge
Are equal in their real components but differ in their quadrature components i ncluding algebraic signs.
In a multiple capacitora the plate area is
Increased
The same
Decreased
Variable
Which of the following does not refer to electrical energy?
Volt-ampere
Joule
Watt-second
Volt-coulomb