When two in-phase sine waves that have identical frequency and amplitude are added togethera then the result is a sine wave with ___ the amplitude of either.
Half
Twice
Four times
One-fourth
Correct Answer :
B. Twice
Related Questions
For series 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 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
What is the reciprocal of capacitance?
Reluctance
Susceptance
Elastance
Conductance
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
Which of the following is not a factor affecting dielectric strength?
Mass
Moisture content
Temperature
Thickness
Norton�s theorem is what form of an ac equivalent circuit?
Voltage
Current
Both voltage and current
Neither voltage nor current
If the output resistance of a voltage source is 4 a it internal resistance should be
Infinite
Resistor with colored bands in the body
Wire-wound resistor
Carbon-composition resistor
Potentiometer
Rheostat
A capacitor consists of two
Conductors only
Dielectric only
Conductors separated by a dielectric
Dielectric separated by a conductor
A trimmer is a variable capacitor in which capacitance is varied by changing the
Number of plates
Dielectric
Distance between plates
Plate area
The potential gradient in a cable is maximum in
Conductor
Outer sheath
Insulation
Uniformly all over
Which of the following is the statement of Ohm�s law?
Electric current is directly proportional to both voltage and resistance
Electric current varies directly as the voltage and inversely as the resistance
Electrical power is directly proportional to the resistance and inversely as the current squared
Electrical power is directly proportional to both voltage squared and the resistance
What theorem is generally used in the analysis of vacuum tubes?
Superposition theorem
Millman�s theorem
Thevenin�s theorem
Norton�s theorem
When capacitors are connected in parallela the total capacitance is
Greater than the largest capacitor
Smaller than the largest capacitor
Smaller than the smallest capacitor
Greater than the smallest 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
Which of the following is the most popular waveform?
Sinusoidal
Square wave
Triangular
Sawtooth
In calculating maximum instantaneous power ___ voltage or current is used.
Peak
Average
Rms
Instantaneous
A capacitor is used to
Block dc current
Pass dc current
Open voltage source
Short the voltage source
Which of the following dielectric materials makes the highest-capacitance capacitor?
Air
Barium-strontium titanite
Mica
Electrolyte
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
High resistance values are a consequence of the ___ of the film.
Thickness
Length
Thinness
Area
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
It is impossible to change the voltage across a capacitor instantlya as this would produce ___ current.
Infinite
Zero
Low
High
The value of temperature coefficient ( ) is dependent upon
The nature of material and temperature
The length of material
The cross-sectional area of the material
The volume of the material
As applied to a series RLCcircuita bandwidth means
The frequency range for maximum power transfer
The difference between the highest and lowest frequencies of the oscillator
The separation of the half-power points
The frequency at which XL= XC
For a linear circuita ___ voltage or current is used to calculate average power.
Rms
Peak
Average
Instantaneous
A neon glow lamp used as a night light ionizes at approximately
70 V
80 V
90 V
100 V
Parallel resonant circuit is sometimes called as
Acceptor circuit
Rejector circuit
Inductive circuit
Capacitive circuit
The curve between current and frequency is termed as
Voltage curve
Gain curve
Power curve
Resonance curve