What is the total resistance of a two equal valued resistors in series?
The difference of both
The product of both
Twice as one
The sum of their reciprocals
Correct Answer :
C. Twice as one
Related Questions
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
For series capacitorsa total charge is
The sum of individual charges
Equal to the charge of either capacitors
Equal to the product of the charges
The quotient of the charges
Norton�s theorem is ____ Thevenin�s theorem.
The same as
The converse of
Older that
More accurate than
When two coils of identical reactance are in parallel without mutual inductancea the reactance of the combination is ___ the reactance of each coil.
One half
Twice
Four times
One fourth
In Norton�s theorema the short circuit current is obtained by
Opening the load terminals
Shorting the load terminals
Opening the voltage source
Shorting the voltage source
For a parallel ACcircuita ___ is used as a reference phasor.
Voltage
Power
Current
Resistance
When the temperature of copper wire is increased its resistance is
Increased
Decreased
Constant
Zero
Which of the following does not generally affect the value of a capacitor?
The dielectric material used
The surface area of the plates
The thickness of the dielectric
The voltage applied to the plate
When current and voltage arte in phase in an ac circuita the ___ is equal to zero.
Resistance
Reactance
Inductance
Capacitance
In a circuita an active element is one which
Supplies energy
Receives energy
Both supplies and receives energy
Amplifies signal
Which of the following elements is active?
Resistor
Inductor
Capacitor
Ideal voltage source
The ratio of maximum value to the effective value of an alternating quantity is called
Form factor
Peak factor
Dynamic factor
Leakage factor
What does a capacitor store?
Voltage
Charge
Current
Power
If an emf in circuit A produces a current in circuit Ba then the same emf in circuit Bproduces the same current in circuit ? this theorem is known as
Maximum power transfer theorem
Millman�s theorem
Reciprocity theorem
Norton�s theorem
What is the other name of relative permittivity?
Dielectric strength
Potential gradient
Breakdown voltage
Specific inductance capacity
When two complex conjugates are subtracteda the result is a
Quadrature component only
Complex component
In-phase component
Real component
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 rheostat is a form of
Variable resistor
Variable capacitor
Potentiometer
Thermocouple
Which of the following has negative temperature coefficient?
Carbon
Nickel
Brass
Constantan
Another term of the quality factor of the resonant circuit.
Figure of merit
Figure of demerit
Noise factor
Noise figure
Which of the following is the peakiest?
Square wave
Sinusoidal wave
Triangular wave
Rectangular wave
The farad is not equivalent to which of the following combination of units
CV2
C2/J
C/V
J/V2
The internal resistance of an ideal current source is
Infinite
Zero
Equal to the load resistance
To be determined
The temperature coefficient of resistance of electrolytes is
Negative
Positive
Zero
Infinite
A trimmer is a variable capacitor in which capacitance is varied by changing the
Number of plates
Dielectric
Distance between plates
Plate area
Rationalizing the denominator of a complex number means
Eliminating the j component in the denominator
Adding j component in the denominator
Eliminating the j component in the numerator
Adding j component in the numerator
A capacitor is basically constructed of
Two conductors separated by a dielectric
Two dielectric separated by a conductor
Conductors and dielectric
Conductors and semiconductors
Which of the following represents the energy stored in a cap
CV2/2
2Q2/C
C2/V
CV
What is the time constant for L of 240 mH in series with R of 20 ?
12 ms
4.8 s
83.3 s
12 s
VL= VCin a series RLCcircuit when
The value of the impedance is minimum
The power factor is zero
The current leads the total voltage by 90�
The total voltage is zero