A real current source has
Infinite internal resistance
Zero internal resistance
Large internal resistance
Small internal resistance
Correct Answer :
C. Large internal resistance
Related Questions
If the inductance is decreaseda the impedance of the circuit containing a resistor a capacitor and an inductor connected in series to an ac source
Decreases
Increases
Decreases or increases
Decreasesa increases or remains the same
A capacitor requires 12 C of charge to raise its potential of 3 V. What is the capacitance of the capacitor?
36 F
15 F
0.25 F
4 F
In a complex number 5 + j 10a 10 is called ___ part.
Imaginary
Real
Conjugate
Integer
A capacitance of 0.05 F equals
0.05 x 106F
0.05 x 10-6F
0.05 x 10-12F
0.05 x 1012F
When resistance are connected in parallela the total resistance is
Less than the smallest resistance in the connection
Greater than the smallest resistance in the connection
Between the smallest and greatest resistance in the connection
Increasing and decreasing depending upon the supply voltage
Which component opposes voltage change?
Resistor
Inductor
Capacitor
Transistor
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
What rating of a resistor determines its ability to absorb heat?
Wattage
Ohmic
Current
Voltage
Which of the following is the peakiest?
Square wave
Sinusoidal wave
Triangular wave
Rectangular wave
If resonant frequency is 10 kHz and quality factor is 50a then
Bandwidth is 200 Hz
XL= is 50a000
R is 50
XC= is 50a000
The admittance of a parallel RLC circuit is found to be the ___ sum of conductance and susceptances.
Algebraic
Arithmetic
Vector
Phasor
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
At parallel resonancea the currents flowing through L and C are
Infinite
Zero
Unequal
Equal
An intermittent and non-symmetrical alternating current like that obtained from the secondary winding of an induction coil
Faradic current
Transient ac current
Inductive current
Capacitive current
In a circuita a passive element is one which
Supplies energy
Receives energy
Both supplies and receives energy
Attenuates signal
Conventional flow assumes charges flow from
Positive to negative
Positive to positive
Negative to positive
Negative to negative
In an ac circuit with XL and R in seriesa the
Voltages across R and XL are in phase
Voltage across R lags the voltage across XLby 90°
Voltages across R and XL are 180° outof-phase
Voltage across R leads the voltage across XLby 90°
The electric field strength between capacitor plates has a unit
Volts per meter
Volts per mil
Amperes per meter
Amperes per mil
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
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
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.
For parallel 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
A wire of one kilometre length has a resistance of 20 . If the length is halveda then the new resistance is ___ the original resistance.
Half
Twice
One-fourth
Three times
In a series circuit with unequal resistances the
Highest R has the highest V
Lowest R has the highest V
Lowest R has the highest I
Highest R has the highest I
In dividing or multiplying phasor quantitiesa ___ form is used.
Polar
Rectangular
Trigonometric
Exponential
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
What is the total capacitance of 10 capacitorsa each of 20 F in series?
200 F
2 F
100 F
0.5 F
If two equal resistances connected in series across a certain supply are now connected in parallel across the same supplya the power produced will be _____ that of series connection
One-half
One-fourth
Two times
Four times
What refers to the lowest voltage across any insulator that can cause current flow?
Conduction voltage
Critical voltage
Breakdown voltage
Voltage capacity
Delta to wye or wye to delta transformation technique is applied to a ___ network.
One-terminal
Two-terminal
Three-terminal
Complex