The current is ____ times the maximum current at half-power points of a resonance curve.
Correct Answer :
A.
Related Questions
Which of the following is the peakiest?
Square wave
Sinusoidal wave
Triangular wave
Rectangular wave
What is the total resistance of a two equal valued resistors in series?
The difference of both
The product of both
Twice as one
The sum of their reciprocals
For a series circuita the higher the quality factor
The greater the bandwidth
The narrower the passband
The broader the resonance curve
The wider the passband
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
When voltage is applied across a ceramic dielectric the electrostatic field p roduced is 50 times greater than air dielectric. The dielectric constant of ceramic therefore is
What is the hot resistance of a 100 Wa 220 V incandescent lamp?
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
The power factor of a circuit is equal to
RZ
XC/Z
XL/Z
R/Z
Which of the following is not a factor affecting capacitance oor?
Area of plates
Number of plates
Distance between plates
Dielectric material used
For a parallel ACcircuita ___ is used as a reference phasor.
Voltage
Power
Current
Resistance
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
A series RL circuit has R of 10 and XL of 5 a its impedance in rectangular form is given by
10 +j 5
10 + j 10
10 ± j 5
10 ± j 10
In a series RLCcircuit
The current lags VLby 90�
The current leads VLby 90�
XL leads Xcby 90�
Z = jXL at resonance
In an ac wavea 30 degrees of phase is ___ of a cycle.
½
The presence of an electric current is made known by
Electric shock
Effects produced
Magnetic shock
Flashing
Which of the following elements is active?
Resistor
Inductor
Capacitor
Ideal voltage source
The ohmic value of a resistor with negative temperature coefficient
Increases with increasing temperature
Increase with decreasing temperature
Stays unchanged with temperature change
Stays unaffected even with increasing temperature
What theorem is generally used in the analysis of vacuum tubes?
Superposition theorem
Millman�s theorem
Thevenin�s theorem
Norton�s theorem
What does a capacitor store?
Voltage
Charge
Current
Power
If three 100-pF capacitors are connected in seriesa then the total capacitance is
300 pF
100 pF
50 pF
33.3 pF
A gang capacitor is a variable capacitor in which capacitance is varied by changing the
Dielectric
Number of plates
Plate area
Distance between plates
Thevenin�s theorem is what form of an equivalent circuit?
Current
Voltage
Both current and voltage
Neither current nor voltage
The internal resistance of an ideal voltage source is
Infinite
Equal to the load resistance
Zero
To be determined
Series resonance occurs when
XL= XC
XL= R
Z = R
Both A and C
When the temperature of copper wire is increased its resistance is
Increased
Decreased
Constant
Zero
Which of the following does not generally affect the value of a capacitor?
The dielectric material used
The surface area of the plates
The thickness of the dielectric
The voltage applied to the plate
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 preferred resistor value?
43a000
54a321
The factor 0.707for converting peak to rms applies only to
Square waves
Triangle waves
Sawtooth waves
Sine waves
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