A 5 F capacitor charge to 5V has a stored charge equal to
1 c
5 c
25 C
200 c
Correct Answer :
C. 25 C
Related Questions
If resonant frequency is 10 kHz and quality factor is 50a then
Bandwidth is 200 Hz
XL= is 50a000
R is 50
XC= is 50a000
When capacitors are connected in seriesa the total capacitance is
Smaller than the smallest capacitor
Smaller than the largest capacitor
Greater than any of the capacitor
Greater than the largest capacitor
If two complex conjugates are addeda ___ components results.
In-phase
Quadrature
Complex
Outof-phase
The hot resistance of an incandescent lamp is about ___ times its cold resistance.
When the net reactance in a series coil-capacitor circuit is zero at frequency fa the nature of its reactance of frequency 2f is
Inductive
Capacitive
Resistive
Infinite
In a circuita a passive element is one which
Supplies energy
Receives energy
Both supplies and receives energy
Attenuates signal
What refers to such work at very low temperaturesa near absolute zero?
Cryogenics
Superconductivity
Subsonic
Thermionic
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
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
In a complex resistance-reactance planea XLis represented
By an axis opposite the R axis
By an axis perpendicular to the XC axis
By an axis opposite the XCaxis
By an axis parallel to the R axis
The reactance curve is a plot of frequency versus _____ for a series RLCcircuit
Current
Voltage
Gain
Impedance
An ac series circuit is composed of a resistance of 20 a inductive reactance of 40 a and a capacitive reactance of 15 . If a current of 1 ampere is flowinga what is the applied voltage
320 V
32 V
220 V
22 V
The voltage cannot be exactly in phase with the current in a circuit that contains
Only capacitance
Only resistance
Inductance and capacitance
Inductancea capacitance and resistance
When two complex conjugates are subtracteda the result is a
Quadrature component only
Complex component
In-phase component
Real component
Refers specifically to steady state values of quantities in ac circuits which are complex numbers.
Domain
Scalar quantity
Vector quantity
Phasor quantity
Metal tin becomes superconductor at approximately
6 K
3.7 K
5 K
4.7K
The open-circuit voltage at the terminal of load RL is 60V. Under the condition of maximum power transfera the load voltage will be
60 V
15 V
20 V
30 V
The electric field strength between capacitor plates has a unit
Volts per meter
Volts per mil
Amperes per meter
Amperes per mil
A rheostat is a form of
Variable resistor
Variable capacitor
Potentiometer
Thermocouple
The reason why alternating current can induce voltage is
It has high peak value
It has a stronger magnetic field than direct current
It has a constant magnetic field
It has a varying magnetic field
A linear circuit is one whose parameters
Change with change in voltage
Change with change in current
Do not change with voltage and current
Change with change in voltage and current
The ohmic value of a resistor with negative temperature coefficient
Increases with increasing temperature
Increase with decreasing temperature
Stays unchanged with temperature change
Stays unaffected even with increasing temperature
In liquids and gasesa ionization current results from a flow of
Positive or negative ions
Free electrons
Ions that are lighter in weight than electrons
Protons
When the temperature of copper wire is increased its resistance is
Increased
Decreased
Constant
Zero
Permeability is otherwise known as
Magnetic conductivity
Magnetic susceptibility
Electric conductivity
Electric susceptibility
What can be used to estimate resonant frequency and to find reactance at any frequency for any value of capacitor or inductor?
Smith chart
Reactance chart
Impedance chart
Resonance chart
High resistance values are a consequence of the ___ of the film.
Thickness
Length
Thinness
Area
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 ratio of W/VA in an ac circuit means
Power factor
Reactive factor
Quality factor
Load factor
The reason why electrical appliances are not connected in series.
Greater electrical power saving
Power loss is minimum
Appliances have different current ratings
All of the above