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
Correct Answer :
A. One half
Related Questions
The mutual inductance between two coils is ___ the reluctance of magnetic path.
Directly proportional to
Inversely proportional to
Independent to
Equal to
If voltage across the plates of 2 F capacitor is increased by 4 Va then charge on the plates will
Decrease by 2 C
Increase by 2 C
Decrease by 4 C
Increase by 4C
Delta to wye or wye to delta transformation technique is applied to a ___ network.
One-terminal
Two-terminal
Three-terminal
Complex
The potential gradient in a cable is maximum in
Conductor
Outer sheath
Insulation
Uniformly all over
Which of the following is a disadvantage of a wire-wound resistor?
It has reactance in radio-frequency circuits
It cannot handle much power
It draws a large amount of current
It cannot handle high voltage
The ratio of the flux density to the electric field intensity in the dielectric is called
Permittivity
Field intensity
Permeability
Elasticity
The ratio of W/VA in an ac circuit means
Power factor
Reactive factor
Quality factor
Load factor
Permeability is otherwise known as
Magnetic conductivity
Magnetic susceptibility
Electric conductivity
Electric susceptibility
In the 5-band method of capacitor color codinga the first band indicates
Temperature coefficient
Tolerance
1stdigit
Capacitance value
A resistor wound with a wire doubled back on itself to reduce the inductance.
Bifilar resistor
Wire-wound resistor
Anti-inductive resistor
Bleeder resistor
A switch designed to have low capacitance between its terminal when open.
LOCAP switch
AntiLOCAP switch
Anticapacitance switch
Capacitance switch
What increases the resistance of wire at high frequencies?
Temperature
Voltage
Skin effect
Insulation
The farad is not equivalent to which of the following combination of units
CV2
C2/J
C/V
J/V2
Transient period is considered over after
A capacitor is used to
Block dc current
Pass dc current
Open voltage source
Short the voltage source
The ___ of an alternating quantity is defined as the fractional part of a period or cycle through which the quantity has advanced from selected origin.
Phase
Frequency
Amplitude
Waveform
What fusion of elements is without chemical action between them?
Mixture
Compound
Alloy
Ionization
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
A trigger circuit consisting of a capacitor of 0.01 F is connected in series with a resistor. If the circuit requires 100 Vdcto operatea determine the value of the resistor when time constant is 0.009s.
900 k
900 M
900 G
Parallel resonant circuit is sometimes called as
Acceptor circuit
Rejector circuit
Inductive circuit
Capacitive circuit
In an ac circuita the power dissipated as heat depends on
Impedance
Capacitive reactance
Resistance
Inductive reactance
The presence of an electric current is made known by
Electric shock
Effects produced
Magnetic shock
Flashing
For a carbon composition resistora typical resistance values range from
2.7 to 22 M
1000 to 10000
10 to 10 M
2.7 to 2.7G
A capacitance of 6 ��F means
6 pF
6 nF
6 fF
6 aF
What determines the direction of induced emf in a conductor or coil?
Cork screw rule
Fleming�s left hand rule
Ampere�s circuital law
Fleming�s right hand rule
Loop currents should be assumed to flow in which direction
Straight
Clockwise
Counter-clockwise
Either B or C arbitrarily selected
If a coil has a Q of 10a it means that
The energy stored in the magnetic field of the coil is 10 times the energy wasted in its resistance
The energy wasted in its resistance is 10 times the energy stored in the magnetic field of the coil
It is a low Q coil
It is a high Q coil
Refers to the outward-curving distortion of the lines of force near the edges of two parallel metal plates that form a capacitor.
Skin effect
Night effect
Edge effect
Hall effect
What is the value of a carbon composition resistor with the following color code: Browna whitea orangea red
190 ; 10 %
19 k ; 2 %
19 k ; 20 %
1.9 k ; 2 %
A trimmer is a variable capacitor in which capacitance is varied by changing the
Number of plates
Dielectric
Distance between plates
Plate area