Which factor does not affect resistance?
Length
Resistivity
Cross-sectional area
Mass
Correct Answer :
D. Mass
Related Questions
Which of the following is neither a basic physical law nor deliverable from one?
Ohm�s law
Coulomb�s law
Kirchhoff�s first law
Kirchhoff�s second law
The capacitance of a capacitor is ___ relative permittivity.
Directly proportional to
Inversely proportional to
Equal to
Inversely proportional to the square of
If one resistance in a series connection is opena then
The current is zero in all the other resistances
The current is maximum in all the other resistances
The voltage is zero across the open resistance
The voltage is infinite across the open resistance
In a series RLCcircuit
Increasing the frequency decreases the resistance
Increasing the frequency increases the resistance
Both XLand XCchange as frequency changes
Impedance will always decrease
Which of the following is also known as antiresonant circuit?
Parallel resonant circuit
Series resonant circuit
Tuned circuit
Tank circuit
For a linear circuita ___ voltage or current is used to calculate average power.
Rms
Peak
Average
Instantaneous
What is the resonant frequency of a circuit when L of 25 microhenrys and C of 10 picofarads are in parallel?
10.1 kHz
10.1 MHz
101 MHz
101 kHz
It is impossible to change the voltage across a capacitor instantlya as this would produce ___ current.
Infinite
Zero
Low
High
What is the reciprocal of capacitance?
Reluctance
Susceptance
Elastance
Conductance
The resistance of an insulator ___ when its temperature is increased.
Decreases
Remains the same
Increases
Varies
For multi-plate capacitora capacitance is proportional to
Number of plates less one(n ± 1)
Number of plates plus one(n + 1)
Number of plates less two(n - 2)
Number of plates (n)
The ratio between the active power and the apparent power of a load in an ac circuit is called
Quality factor
Power factor
Power ratio
Power reactive
A capacitive load always has a ______ power facto
Leading
Lagging
Zero
Unity
What capacitance exists not through design but simply because two conducting surfaces are relatively close to each other?
Surge
Stray
Natural
Normal
A capacitor opposes change in
Voltage
Current
Voltage and current
Neither voltage nor current
Which of the following materials has the lowest dielectric strength?
Glass
Paper
Mica
Teflon
What is the cross-sectional are of a conductor whose diameter is 0.001 inch?
One micron
One angstrom
One steradian
One circular mil
The mutual inductance between two coils is ___ the reluctance of magnetic path.
Directly proportional to
Inversely proportional to
Independent to
Equal to
Leakage resistance in a capacitor results into
Internal heating
Internal bleeding
Shorter useful life
Short-circuiting
A 5 F capacitor charge to 5V has a stored charge equal to
1 c
5 c
25 C
200 c
The arc across a switch when it open an RL circuit is a result of the
Large self-induced voltage across L
Long time constant
Low resistance of the open switch
Surge of resistance
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
What fusion of elements is without chemical action between them?
Mixture
Compound
Alloy
Ionization
A series RLCcircuit consists of a 10 resistor in series with L = 10 Ha and C= 100 F. Determine a new value of Ia for which the resonant frequency is one ±half the original value.
40 H
40 mH
40 pH
40 nH
In a rectangular wavea the form factor is
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
The presence of an electric current is made known by
Electric shock
Effects produced
Magnetic shock
Flashing
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
And ideal current source has an internal conductance of _____ siem
Infinite
One
Zero
One million
A series RLCcircuit has a ______ power factor at its half-power points
Unity
Leading
Lagging
Either B or C