Which of the following is a way of decreasing mutual inductance?
Moving the coils closer
Moving the coils apart
Decreasing the number of turns of either coil
Increasing the number of turns of either coil
Correct Answer :
B. Moving the coils apart
Related Questions
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
Which of the following does not generally affect the value of a capacitor?
The dielectric material used
The surface area of the plates
The thickness of the dielectric
The voltage applied to the plate
For greater accuracya the value of phase angle should be determined from
Cos
Tan
Sin
Sec
Parallel resonant circuit is sometimes called as
Acceptor circuit
Rejector circuit
Inductive circuit
Capacitive circuit
What does a capacitor store?
Voltage
Charge
Current
Power
In a pure capacitancea
Current leads voltage by 90�
Current leads voltage by 180�
Current lags voltage by 90�
Current lags voltage by 180�
A wire of one kilometre length has a resistance of 20 . If the length is halveda then the new resistance is ___ the original resistance.
Half
Twice
One-fourth
Three times
A neon glow lamp used as a night light ionizes at approximately
70 V
80 V
90 V
100 V
Which of the following capacitors are used only in dc circuits?
Mica
Ceramic
Mylar
Electrolytic
Which statement is true about a passive circuit?
A circuit with neither a source of current nor a source of potential difference
A circuit with a voltage source
A circuit with a current source
A circuit with only resistance as a load
For a parallel ACcircuita ___ is used as a reference phasor.
Voltage
Power
Current
Resistance
According to Gauss theorema flux can be equated to
Charge
Field intensity
Current
Voltage
An inductance of 1 mH is
0.001 H
0.01 H
0.0001 H
0.10 H
A rheostat is a form of
Variable resistor
Variable capacitor
Potentiometer
Thermocouple
In a series RLCcircuit
The current lags VLby 90�
The current leads VLby 90�
XL leads Xcby 90�
Z = jXL at resonance
Which of the following is the most popular waveform?
Sinusoidal
Square wave
Triangular
Sawtooth
Permeability is otherwise known as
Magnetic conductivity
Magnetic susceptibility
Electric conductivity
Electric susceptibility
What is the temperature coefficient of the resistance Eureka?
Infinity
Negative
Almost zero
Positive
Leakage resistance in a capacitor results into
Internal heating
Internal bleeding
Shorter useful life
Short-circuiting
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
If the output resistance of a voltage source is 4 a it internal resistance should be
Infinite
A 0.09 microfarad capacitor is charged to 220 volts. How long in milliseconds will it discharged resistor has a resistance of 20a000 ohms?
What is the peak factor for alternating current or voltage varying sinusiodally?
Metal tin becomes superconductor at approximately
6 K
3.7 K
5 K
4.7K
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
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
In a resonant circuita if Q ? 10 resonant frequency _______ bandwidth.
Bisects
Exceeds
Is less than
Is equal to
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
What is the complex impedance of a circuit with an absolute resistance of 300 ?
0 + j 300
300 + j 90
0 ± j 300
300 +j 0
Another term for superconductor.
Generic conductor
Ultraconductor
Cryotron
Cryogenic conductor