The charging of a capacitor through a resistance follows what law?
Linear law
Hyperbolic law
Inverse-square law
Exponential law
Correct Answer :
D. Exponential law
Related Questions
Refers specifically to steady state values of quantities in ac circuits which are complex numbers.
Domain
Scalar quantity
Vector quantity
Phasor quantity
If three 9 mH inductors are connected in parallel without mutual inductance then the total i nductance is
3 mH
9 mH
27mH
18 mH
What fusion of elements is without chemical action between them?
Mixture
Compound
Alloy
Ionization
What determines the magnitude of electric current?
The rate at which electrons are produced
The type of material used
The current carrying capacity of the circuit
The rate at which electrons pass a given point
The Q-factor of a parallel resonant circuit is also known as
Voltage magnification factor
Current magnification factor
Gain magnification factor
Resonance magnification factor
For a linear circuita ___ voltage or current is used to calculate average power.
Rms
Peak
Average
Instantaneous
The electric field strength between capacitor plates has a unit
Volts per meter
Volts per mil
Amperes per meter
Amperes per mil
For maximum power transfera what is the relation between load resistance RL and internal resistance R of the voltage source?
RL= 2 r
RL= 1.5 r
RL= r
RL= 3 r
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
The presence of an electric current is made known by
Electric shock
Effects produced
Magnetic shock
Flashing
The Q-factor of a series resonant circuit is also known as
Current magnification factor
Voltage magnification factor
Load factor
Leakage factor
The symbol Q refers to
Resonance quotient
Quality factor
Power quotient
Qualification test
In the 5-band method of capacitor color codinga the first band indicates
Temperature coefficient
Tolerance
1stdigit
Capacitance value
An inductor carries 2 A dc. If its inductance is 100 Ha then what is its inductive reactance?
Zero
1.3 k
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
What theorem is generally used in the analysis of vacuum tubes?
Superposition theorem
Millman�s theorem
Thevenin�s theorem
Norton�s theorem
For a parallel ACcircuita ___ is used as a reference phasor.
Voltage
Power
Current
Resistance
Which of the following represents the energy stored in a cap
CV2/2
2Q2/C
C2/V
CV
The second strip of an electronic resistor color-code represents
The multiplier
The second digit of the value
The temperature
The tolerance
What is the half-power bandwidth of a parallel resonant circuit which has a resonant frequency of 3.6 MHz and Q of 218?
1.65 kHz
16.5 MHz
16.5 kHz
165 kHz
The ratio between the reactive power and the apparent power of an ac load is called
Quality factor
Power factor
Power ratio
Reactive power
Which is considered as the effect of a dielectric material?
Increasing capacitance
Decreasing capacitance
Reducing the working voltage
Increasing the distance between the plates
What is the reciprocal of quality factor?
Power factor
Reactive factor
Dissipation factor
1/Q factor
Which of the following is the peakiest?
Square wave
Sinusoidal wave
Triangular wave
Rectangular wave
Series resonance occurs when
XL= XC
XL= R
Z = R
Both A and C
When two pure sine waves of the same frequency and the same amplitude which are exactly 180� outof-phase are added togethera the result is
A wave with twice the amplitude
A wave with half the amplitude
Zero signal
A wave with twice the frequency
Which one of the following elements serves as a protection against overload?
Fuse
Switch
Resistor
Relay
If two complex conjugates are addeda ___ components results.
In-phase
Quadrature
Complex
Outof-phase
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
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