For a series ACcircuita ___ is not used as a reference phasor.
Voltage
Impedance
Current
Conductance
Correct Answer :
A. Voltage
Related Questions
The value of temperature coefficient ( ) is dependent upon
The nature of material and temperature
The length of material
The cross-sectional area of the material
The volume of the material
Which of the following is a disadvantage of a wire-wound resistor?
It has reactance in radio-frequency circuits
It cannot handle much power
It draws a large amount of current
It cannot handle high voltage
The capacitance of a capacitor is ___ relative permittivity.
Directly proportional to
Inversely proportional to
Equal to
Inversely proportional to the square of
When frequency of an ac wave decreasesa the value of XLin a coil
Approaches zero
Gets larger positively
Gets larger negatively
Stays constant
Which of the following is a way of decreasing mutual inductance?
Moving the coils closer
Moving the coils apart
Decreasing the number of turns of either coil
Increasing the number of turns of either coil
Which of the following is a preferred resistor value?
43a000
54a321
Which of the following conditions is not true for a series RLCcircuit at resonance?
Z = jXL
XL= XC
The power factor is one
The magnitude of Z is
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
Which of the following is the most popular waveform?
Sinusoidal
Square wave
Triangular
Sawtooth
What is expected when two 20 k a 1 watt resistor in parallel are use instead of one 10 k a 1 watt?
Provides higher current
Provides less power
Provides more power
Provides wider tolerance
What is the reciprocal of capacitance?
Reluctance
Susceptance
Elastance
Conductance
Which of the statements below is not true?
Current source is an active element
Resistor is a linear element
Voltage source is a passive element
Diode is a non-linear element
It is impossible to change the voltage across a capacitor instantlya as this would produce ___ current.
Infinite
Zero
Low
High
Which one of the following elements serves as a protection against overload?
Fuse
Switch
Resistor
Relay
Which of the following is the peakiest?
Square wave
Sinusoidal wave
Triangular wave
Rectangular wave
High resistance values are a consequence of the ___ of the film.
Thickness
Length
Thinness
Area
Which of the following has negative temperature coefficient?
Carbon
Nickel
Brass
Constantan
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)
Under the conditions of maximum power transfera a voltage source is delivering a power of 15 W to the load. What is the power generated by the source?
60 W
30 W
15 W
4 W
What fusion of elements is without chemical action between them?
Mixture
Compound
Alloy
Ionization
When two unequal values of resistors are connected in parallel across a dc sourcea greater current flows through the
Higher resistance
Lower resistance
Higher wattage resistance
Lower wattage resistance
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
A lead conductor has a resistance of 25 at 0 �C. Determine its resistance at -30 �C
Refers to the outward-curving distortion of the lines of force near the edges of two parallel metal plates that form a capacitor.
Skin effect
Night effect
Edge effect
Hall effect
Transient period is considered over after
A law which states that when a constant electromotive force is applied to a circuit consisting of a resistor and capacitor connected in seriesa the time taken for the potential on the plates of the capacitor to rise to any given fraction of its final value depends only on the product of capacitance and resistance.
Child�s law
CR law
Coulomb�s law
Debye T3 law
The mutual inductance between two coils is ___ the reluctance of magnetic path.
Directly proportional to
Inversely proportional to
Independent to
Equal to
In a circuita a passive element is one which
Supplies energy
Receives energy
Both supplies and receives energy
Attenuates signal
Which waveform in which the rms value and the mean value are equal?
Square wave
Triangular wave
Sine wave
Sawtooth
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