Which of the following is not considered a physical factor affecting resistance?
Length
Material type
Temperature
Cross-sectional
Correct Answer :
C. Temperature
Related Questions
A capacitor is basically constructed of
Two conductors separated by a dielectric
Two dielectric separated by a conductor
Conductors and dielectric
Conductors and semiconductors
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
The usual load of a dc circuit is a/an
Resistor
Capacitor
Inductor
Both inductor and capacitor
A real current source has
Infinite internal resistance
Zero internal resistance
Large internal resistance
Small internal resistance
What is the specific resistance of a pure silicon?
55 -mm
55 -m
55 -cm
55 k -m
In a pure capacitancea
Current leads voltage by 90�
Current leads voltage by 180�
Current lags voltage by 90�
Current lags voltage by 180�
For a series circuita the higher the quality factor
The greater the bandwidth
The narrower the passband
The broader the resonance curve
The wider the passband
In adding or subtracting phasor quantitiesa ___ form is the most convenient.
Polar
Rectangular
Trigonometric
Exponential
Which of the following is also known as antiresonant circuit?
Parallel resonant circuit
Series resonant circuit
Tuned circuit
Tank circuit
Which one of the following elements serves as a protection against overload?
Fuse
Switch
Resistor
Relay
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
What is the temperature coefficient of the resistance Eureka?
Infinity
Negative
Almost zero
Positive
A coil of inductance L has an inductive reactance of XLin an ac circuit in which the effective current is I. The coil is made from a superconducting material. The rate at which power is dissipated in the coil is
I2XL
IXL
IXL2
The admittance of a parallel RLC circuit is found to be the ___ sum of conductance and susceptances.
Algebraic
Arithmetic
Vector
Phasor
When voltage is applied across a ceramic dielectric the electrostatic field p roduced is 50 times greater than air dielectric. The dielectric constant of ceramic therefore is
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 Q-factor of a parallel resonant circuit is also known as
Voltage magnification factor
Current magnification factor
Gain magnification factor
Resonance magnification factor
And ideal current source has an internal conductance of _____ siem
Infinite
One
Zero
One million
If two resistances of 9 and 6 are connected in parallela the total resistance is
Parallel resonant circuit is sometimes called as
Acceptor circuit
Rejector circuit
Inductive circuit
Capacitive circuit
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 curve between current and frequency is termed as
Voltage curve
Gain curve
Power curve
Resonance curve
With double the number of turns by the same length and areaa the inductance is
The same
Doubled
Quartered
Quadrupled
In a series RLCcircuit
The current lags VLby 90�
The current leads VLby 90�
XL leads Xcby 90�
Z = jXL at resonance
What refers to such work at very low temperaturesa near absolute zero?
Cryogenics
Superconductivity
Subsonic
Thermionic
If a capacitor is rated for 200V dca what is its effective ac working voltage?
50 V
100 V
200 V
400 V
Which of the following is not a factor affecting dielectric strength?
Mass
Moisture content
Temperature
Thickness
Series resonance occurs when
XL= XC
XL= R
Z = R
Both A and C
What is the specific resistance of a pure germanium?
55 -cm
55 -m
55 -mm
55 k -m
If the capacitance of mica capacitor is 5 times the capacitcitora then the relative permittivity of mica is