In an ac wavea 30 degrees of phase is ___ of a cycle.
½
Correct Answer :
B.
Related Questions
If a multiplate capacitor has 10 platesa each of area 10 cm2a then
10 capacitors will be in parallel
10 capacitors will be in series
9 capacitors will be in parallel
9 capacitors will be in series
A series RLCcircuit consists of a 10 resistor in series with L = 10 Ha and C= 100 F. Determine a new value of Ia for which the resonant frequency is one ±half the original value.
40 H
40 mH
40 pH
40 nH
Which of the following conditions is not true for a series RLCcircuit at resonance?
Z = jXL
XL= XC
The power factor is one
The magnitude of Z is
Barium-strontium titanite dielectric material is also called
Ceramic
Polyster
Electrolytic
Bakelite
The reactance curve is a plot of frequency versus _____ for a series RLCcircuit
Current
Voltage
Gain
Impedance
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 is the other name of relative permittivity?
Dielectric strength
Potential gradient
Breakdown voltage
Specific inductance capacity
What refers to the lowest voltage across any insulator that can cause current flow?
Conduction voltage
Critical voltage
Breakdown voltage
Voltage capacity
The reciprocal of a complex number is
A complex number
A real number
An imaginary number
A whole number
In dividing or multiplying phasor quantitiesa ___ form is used.
Polar
Rectangular
Trigonometric
Exponential
The factor 0.707for converting peak to rms applies only to
Square waves
Triangle waves
Sawtooth waves
Sine waves
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
A circuit whose parameters change with voltage or current.
Non-linear circuit
Linear circuit
Complex circuit
Passive circuit
What is the temperature coefficient of the resistance Eureka?
Infinity
Negative
Almost zero
Positive
The current is ____ times the maximum current at half-power points of a resonance curve.
What is a rotating vector whose projection can represent either current or voltage in an ac circuit?
Polar diagram
Scalar quantity
Velocity
Phasor
According to Gauss theorema flux can be equated to
Charge
Field intensity
Current
Voltage
Which of the following is the most popular waveform?
Sinusoidal
Square wave
Triangular
Sawtooth
An ac series circuit is composed of a resistance of 20 a inductive reactance of 40 a and a capacitive reactance of 15 . If a current of 1 ampere is flowinga what is the applied voltage
320 V
32 V
220 V
22 V
The superposition theorem is used when the circuit contains
Reactive elements
Active elements
Number of voltage sources
Single voltage source
In an RL series circuita
Current lags voltage by less than 90�
Current lags voltage by 180�
Current lags voltage by 90�
Current leads voltage by 90�
A resistor wound with a wire doubled back on itself to reduce the inductance.
Bifilar resistor
Wire-wound resistor
Anti-inductive resistor
Bleeder resistor
Effects of capacitance
It opposes any change in the amount of voltage
Voltage is lagged behind the current by a quarter cycle
Electric energy is stored in the capacitor in the form of electrostatic field
All of the above
Parallel resonant circuit is sometimes called as
Acceptor circuit
Rejector circuit
Inductive circuit
Capacitive circuit
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
Of the equivalent combination of unitsa which one is not equal to watt?
2/V
AV
A2
J/s
What is the most common non-sinusoidal waveform?
Square wave
Triangular wave
Trapezoidal wave
Sawtooth wave
A capacitive load always has a ______ power facto
Leading
Lagging
Zero
Unity
The area of capacitor plates increases two timesa then its capacitance
Increases two times
Increases four times
Decreases two times
Decreases four times
The symbol Q refers to
Resonance quotient
Quality factor
Power quotient
Qualification test