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
Correct Answer :
C. Voltage source is a passive element
Related Questions
What theorem is generally used in the analysis of vacuum tubes?
Superposition theorem
Millman�s theorem
Thevenin�s theorem
Norton�s theorem
Which of the following is not considered a physical factor affecting resistance?
Length
Material type
Temperature
Cross-sectional
A series-parallel combination of identical resistors will
Increase the power rating compared with one resistor alone
Increase the voltage rating compared with one resistor alone
Reduce the voltage rating compared with resistor alone
Result in an expensive circuit
At parallel resonancea the currents flowing through L and C are
Infinite
Zero
Unequal
Equal
A capacitance of 6 ��F means
6 pF
6 nF
6 fF
6 aF
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
Property of an electric circuit that dissipates electric energy
Reactance
Impedance
Resistance
Conductance
Loop currents should be assumed to flow in which direction
Straight
Clockwise
Counter-clockwise
Either B or C arbitrarily selected
What is the hot resistance of a 100 Wa 220 V incandescent lamp?
An impedance given by 90 -45� is a/an ___ impedance.
Inductive
Conductive
Resistive
Capacitive
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
Which one of the following elements serves as a protection against overload?
Fuse
Switch
Resistor
Relay
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
What is considered as the most important value of a sine wave?
Effective value
Peak value
Average value
Instantaneous value
Another term of the quality factor of the resonant circuit.
Figure of merit
Figure of demerit
Noise factor
Noise figure
The capacitor opposes any change in voltage across it by
Passing a voltage proportional to the rate of change of current
Acting as a short circuit at time equal to zero
Passing a current proportional to the rate of change of voltage
Acting as a short circuit at time equal to infinity
The Q-factor of a parallel resonant circuit is also known as
Current magnification factor
Voltage magnification factor
Load factor
Leakage factor
A capacitor is used to
Block dc current
Pass dc current
Open voltage source
Short the voltage source
Which of the following is not a factor affecting dielectric strength?
Mass
Moisture content
Temperature
Thickness
The temperature coefficient of resistance of electrolytes is
Negative
Positive
Zero
Infinite
Which factor does not affect resistance?
Length
Resistivity
Cross-sectional area
Mass
When the temperature of copper wire is increased its resistance is
Increased
Decreased
Constant
Zero
Which component opposes voltage change?
Resistor
Inductor
Capacitor
Transistor
The reactance curve is a plot of frequency versus _____ for a series RLCcircuit
Current
Voltage
Gain
Impedance
A capacitor consists of two
Conductors only
Dielectric only
Conductors separated by a dielectric
Dielectric separated by a conductor
Thevenin�s theorem is what form of an equivalent circuit?
Current
Voltage
Both current and voltage
Neither current nor voltage
With double the number of turns by the same length and areaa the inductance is
The same
Doubled
Quartered
Quadrupled
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
The charging of a capacitor through a resistance obeys
Exponential law
Logarithmic law
Linear law
Square law
A real current source has
Infinite internal resistance
Zero internal resistance
Large internal resistance
Small internal resistance