What is considered as the most important value of a sine wave?
Effective value
Peak value
Average value
Instantaneous value
Correct Answer :
A. Effective value
Related Questions
The temperature coefficient of resistance of electrolytes is
Negative
Positive
Zero
Infinite
Conventional flow assumes charges flow from
Positive to negative
Positive to positive
Negative to positive
Negative to negative
What is the resonant frequency of a circuit when L of 3 microhenrys and C of 40 picofarads are in series?
14.5 kHz
145 MHz
14.5 MHz
145 kHz
A lead conductor has a resistance of 25 at 0 �C. Determine its resistance at -30 �C
Voltage resonance means
Series resonance
Parallel resonance
Current magnification
Gain magnification
What is the peak factor for alternating current or voltage varying sinusiodally?
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
The charging of a capacitor through a resistance obeys
Exponential law
Logarithmic law
Linear law
Square law
High resistance values are a consequence of the ___ of the film.
Thickness
Length
Thinness
Area
According to Gauss theorema flux can be equated to
Charge
Field intensity
Current
Voltage
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
The maximum power transfer theorem is used in
Power system
Electronic system
Refrigeration
Air conditioning
What maximum voltage can be applied across the capacitor of time?
Working voltage
Surge voltage
Stray voltage
Peak voltage
Which of the following describes the action of a capacitor?
Stores electrical energy
Opposes changes in current flow
Creates a dc resistance
Converts ac to dc
An open resistor when checked with an ohmmeter reads
Zero
Infinite
High but within the tolerance
Low but not zero
Capacitance increase with
Larger plate area and less distance between plates
Larger plate area and greater distance between plates
Smaller plate area and less distance between plates
Higher values of applied voltage
When the temperature of copper wire is increased its resistance is
Increased
Decreased
Constant
Zero
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
In a resonant circuita if Q ? 10 resonant frequency _______ bandwidth.
Bisects
Exceeds
Is less than
Is equal to
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
The reciprocal of a complex number is
A complex number
A real number
An imaginary number
A whole number
Permeability is otherwise known as
Magnetic conductivity
Magnetic susceptibility
Electric conductivity
Electric susceptibility
In a multiple capacitora the plate area is
Increased
The same
Decreased
Variable
A tank circuit is a
Parallel LC circuit
Series LCcircuit
A resonant circuit
A non-resonant circuit
Two complex numbers or phasors are said to be conjugate if they
Differ only in the algebraic sign of their quadratic components
Differ only in the algebraic sign of their real components
Are equal in their real and quadrature components including alge
Are equal in their real components but differ in their quadrature components i ncluding algebraic signs.
What theorem is usually used in the analysis of transistor circuit?
Superposition theorem
Millman�s theorem
Thevenin�s theorem
Norton�s theorem
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 an ac wavea 30 degrees of phase is ___ of a cycle.
½
The current is ____ times the maximum current at half-power points of a resonance curve.
The wavelength of an alternating waveform depends upon the ___ of the variation.
Period
Number
Frequency
Amplitude