For greater accuracya the value of phase angle should be determined from
Cos
Tan
Sin
Sec
Correct Answer :
B. Tan
Related Questions
Delta to wye or wye to delta transformation technique is applied to a ___ network.
One-terminal
Two-terminal
Three-terminal
Complex
What capacitance exists not through design but simply because two conducting surfaces are relatively close to each other?
Surge
Stray
Natural
Normal
When the temperature of copper wire is increased its resistance is
Increased
Decreased
Constant
Zero
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
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
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
In a resonant circuita if Q ? 10 resonant frequency _______ bandwidth.
Bisects
Exceeds
Is less than
Is equal to
If two resistances of 9 and 6 are connected in parallela the total resistance is
A series-parallel combination of identical resistors will
Increase the power rating compared with one resistor alone
Increase the voltage rating compared with one resistor alone
Reduce the voltage rating compared with resistor alone
Result in an expensive circuit
The maximum power transfer theorem is used in
Power system
Electronic system
Refrigeration
Air conditioning
Another term of the quality factor of the resonant circuit.
Figure of merit
Figure of demerit
Noise factor
Noise figure
The reactance curve is a plot of frequency versus _____ for a series RLCcircuit
Current
Voltage
Gain
Impedance
Which of the following elements is active?
Resistor
Inductor
Capacitor
Ideal voltage source
For maximum power transfera what is the relation between load resistance RL and internal resistance R of the voltage source?
RL= 2 r
RL= 1.5 r
RL= r
RL= 3 r
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.
The farad is not equivalent to which of the following combination of units
CV2
C2/J
C/V
J/V2
What theorem is usually used in the analysis of transistor circuit?
Superposition theorem
Millman�s theorem
Thevenin�s theorem
Norton�s theorem
How many coulombs are delivered by a storage battery in 25 hours if it is supplying current at the rate of 3 A?
2.592 x 105C
2.592 x 103 C
2.592 x 108 C
2.592 x 1012 C
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
A trimmer is a variable capacitor in which capacitance is varied by changing the
Number of plates
Dielectric
Distance between plates
Plate area
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 factor does not affect resistance?
Length
Resistivity
Cross-sectional area
Mass
A capacitor opposes change in
Voltage
Current
Voltage and current
Neither voltage nor current
What is the half-power bandwidth of a parallel resonant circuit which has a resonant frequency of 3.6 MHz and Q of 218?
1.65 kHz
16.5 MHz
16.5 kHz
165 kHz
A tank circuit is a
Parallel LC circuit
Series LCcircuit
A resonant circuit
A non-resonant circuit
Leakage resistance in a capacitor results into
Internal heating
Internal bleeding
Shorter useful life
Short-circuiting
A coil of inductance L has an inductive reactance of XLin an ac circuit in which the effective current is I. The coil is made from a superconducting material. The rate at which power is dissipated in the coil is
I2XL
IXL
IXL2
The ratio between the active power and the apparent power of a load in an ac circuit is called
Quality factor
Power factor
Power ratio
Power reactive
The graph between an alternating quantity and time is called
Sine wave
Curve
Waveform
A plot
With double the number of turns by the same length and areaa the inductance is
The same
Doubled
Quartered
Quadrupled