The graph between an alternating quantity and time is called
Sine wave
Curve
Waveform
A plot
Correct Answer :
C. Waveform
Related Questions
Which of the following is a common material used in wire-wound resistors?
Manganin
Carbon
Bronze
German silver wire
The power factor of a circuit is equal to
RZ
XC/Z
XL/Z
R/Z
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 distance between the capacitor plates increases two timesa then its capacitance
Increases two times
Increases four times
Decreases two times
Decreases four times
The second strip of an electronic resistor color-code represents
The multiplier
The second digit of the value
The temperature
The tolerance
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
Which of the following does not refer to electrical energy?
Volt-ampere
Joule
Watt-second
Volt-coulomb
The Q-factor of a parallel resonant circuit is also known as
Voltage magnification factor
Current magnification factor
Gain magnification factor
Resonance magnification factor
Which of the following does not affect resistance?
Resistivity
Cross-sectional area
Mass
Length
When the temperature of copper wire is increased its resistance is
Increased
Decreased
Constant
Zero
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
Which of the following materials has the lowest dielectric strength?
Glass
Paper
Mica
Teflon
When two complex conjugates are subtracteda the result is a
Quadrature component only
Complex component
In-phase component
Real component
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
For a triangular and sawtooth waveform the rms voltage or current equals
0.707times peak value
0.577 times peak value
0.577times average value
0.707times rms value
In dividing or multiplying phasor quantitiesa ___ form is used.
Polar
Rectangular
Trigonometric
Exponential
What value of R is needed with a 0.05 F Cfor an RCtime constant of 0.02 s?
400 M
400 G
400 k
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
The usual load of a dc circuit is a/an
Resistor
Capacitor
Inductor
Both inductor and capacitor
What is the rms value of a square wave?
Equals its peak value
Equals its peak-to-peak value
Peak divided by square root of two
Peak divided by pi
What is the conductance of a circuit having three 10 resistors in parallel?
0.3 S
3.33 S
0.33 S
30 S
What is the specific resistance of a pure silicon?
55 -mm
55 -m
55 -cm
55 k -m
An impedance given by 90 -45� is a/an ___ impedance.
Inductive
Conductive
Resistive
Capacitive
The average value of a triangular or sawtooth wave is _____ times its peak value.
A factor that states how much the resistance changes for a change in temperature?
Resistivity
Specific resistance
Coefficient of temperature change
Temperature coefficient of resistance
What is the efficiency under the conditions of maximum power transfer?
What fusion of elements is without chemical action between them?
Mixture
Compound
Alloy
Ionization
The ratio of the flux density to the electric field intensity in the dielectric is called
Permittivity
Field intensity
Permeability
Elasticity
The result of rust in electrical (wire) connection is
Inductance
Conductance
Impedance
Resistance
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