When two complex conjugates are subtracteda the result is a
Quadrature component only
Complex component
In-phase component
Real component
Correct Answer :
A. Quadrature component only
Related Questions
If two complex conjugates are addeda ___ components results.
In-phase
Quadrature
Complex
Outof-phase
Which of the following has negative temperature coefficient?
Carbon
Nickel
Brass
Constantan
Delta to wye or wye to delta transformation technique is applied to a ___ network.
One-terminal
Two-terminal
Three-terminal
Complex
An inductance of 1 mH is
0.001 H
0.01 H
0.0001 H
0.10 H
When two pure sine waves of the same frequency and the same amplitude which are exactly 180� outof-phase are added togethera the result is
A wave with twice the amplitude
A wave with half the amplitude
Zero signal
A wave with twice the frequency
Which of the following is not a factor affecting dielectric strength?
Mass
Moisture content
Temperature
Thickness
In an ac wavea 30 degrees of phase is ___ of a cycle.
½
The electric field strength between capacitor plates has a unit
Volts per meter
Volts per mil
Amperes per meter
Amperes per mil
What is considered as the most important value of a sine wave?
Effective value
Peak value
Average value
Instantaneous value
Which of the following is also known as antiresonant circuit?
Parallel resonant circuit
Series resonant circuit
Tuned circuit
Tank circuit
³Any resistance R in a branch of a network in which a current I is flowing can be replaced by a voltage equal to IR�. This states
Compensation theorem
Reciprocity theorem
Millman�s theorem
Superposition theorem
What is the total capacitance of 10 capacitorsa each of 20 F in series?
200 F
2 F
100 F
0.5 F
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 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
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°
When current and voltage arte in phase in an ac circuita the ___ is equal to zero.
Resistance
Reactance
Inductance
Capacitance
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
Norton�s theorem is ____ Thevenin�s theorem.
The same as
The converse of
Older that
More accurate than
If three 100-pF capacitors are connected in seriesa then the total capacitance is
300 pF
100 pF
50 pF
33.3 pF
A capacitor opposes change in
Voltage
Current
Voltage and current
Neither voltage nor current
Which waveform in which the rms value and the mean value are equal?
Square wave
Triangular wave
Sine wave
Sawtooth
The presence of an electric current is made known by
Electric shock
Effects produced
Magnetic shock
Flashing
What is the reading of an ohmmeter for a shorted capacitor?
Zero
Infinity
k
M
A capacitor of 0.5 F charged to 220 V is connected across an uncharged 0.5 F capacitor. What is the voltage across each capacitor?
220 V
150 V
110 V
22 V
The unit of elastance is
Farad
Daraf
Siemen
Henry
What is the hot resistance of a 100 Wa 220 V incandescent lamp?
The superposition theorem is used when the circuit contains
Reactive elements
Active elements
Number of voltage sources
Single voltage source
Inductive reactance applies only to sine waves because it
Increases with lower frequencies
Increases with lower inductance
Depends on the factor 2
Decreases with higher frequencies
Refers specifically to steady state values of quantities in ac circuits which are complex numbers.
Domain
Scalar quantity
Vector quantity
Phasor quantity
What is the reciprocal of quality factor?
Power factor
Reactive factor
Dissipation factor
1/Q factor