Related Questions
What is the correct answer?
4
Hysteresis loss can be reduced by one of the following.
A. Increasing mmf of the circuit
B. Using material narrow hysteresis loop
C. Using ferromagnetic core
D. Laminating the magnetic circuit
What is the correct answer?
4
Which element has four valence electrons?
What is the correct answer?
4
Who demonstrated that there are magnetic effects around every current-carrying conductor and that current-carrying conductors can attract and repel each other just like magnets?
B. Hans Christian Oersted
What is the correct answer?
4
What is the cgs unit of magnetomotive force?
What is the correct answer?
4
The temperature coefficient of resistance of a conductor ______ with an increase in temperature.
What is the correct answer?
4
The idea of preventing one component from affecting another through their common electric and magnetic field is referred to as
What is the correct answer?
4
All matters (gasa liquid and solid) are composed of
What is the correct answer?
4
The magnetic flux through a coil changes. This results to the induced emf acting in a direction as to
C. Either oppose or aid the change
D. Neither oppose nor aid the change
What is the correct answer?
4
__________ is a substance of whose molecules consist of the same kind of atom.
What is the correct answer?
4
Defined as the ratio of the volume occupied by the atoms or ions in a unit cell divided by the volume of the unit cell and is used to measure the compactness of a crystal.
A. Atomic packing factor (APF)
B. Ionic Packing Ratio (IPR)
C. Atomic compacting factor (ACF)
D. Ionic compacting ratio (ICR)
What is the correct answer?
4
How many turns are needed to produce a magnetomotive force of 1000 A.t for a coil with 6 amperes?
What is the correct answer?
4
The total number of magnetic lines of force in a magnetic field is called
C. Magnetic flux intensity
What is the correct answer?
4
Lenz's law is the consequence of the law of conservation of
What is the correct answer?
4
The force between two magnetic poles is _______ their pole strengths.
A. directly proportional to
C. inversely proportional to
What is the correct answer?
4
The unit of electrical energy is
What is the correct answer?
4
Paramagnetic substance has a relative permeability of
A. Slightly less than one
D. Very much greater than one
What is the correct answer?
4
The force of attraction or repulsion between two magnetic poles is directly proportional to their strengths.
B. Faraday's first law of electromagnetic induction
What is the correct answer?
4
The permeability of a material having a flux density of 5 Wb/m^2 is 10^-5 H/m. What is the value of magnetizing force?
What is the correct answer?
4
Ohm's law can be used only to a _____ circuit or component.
What is the correct answer?
4
A group of magnetically aligned atoms is called
What is the correct answer?
4
What is used as the insulating material or dielectric in an electric ion
What is the correct answer?
4
______ is an electromagnet with its core in the form of a close magnetic ring.
What is the correct answer?
4
A magnetic circuit carries a flux iin the iron part and a fluxgin the air gap. What is the leakage coefficient?
What is the correct answer?
4
Bonding of atoms that is due to the force of attraction between positive ions and a group of negative ions
What is the correct answer?
4
In electro-mechanical conversion devices like generators and motors the reason why a small air gap is left between the rotor and stator is to
A. permit mechanical clearance
B. increase flux density in air gap
C. decrease the reluctance of magnetic path
D. complete the magnetic path
What is the correct answer?
4
Electric lines of force leave or enter the charge surface at an angle of
D. depending upon the angle of launch and entry
What is the correct answer?
4
The magnetic flux of 2000 lines is how many Maxwells?
What is the correct answer?
4
The ratio of the permeability of material to the permiabiity of air or vacuum.
What is the correct answer?
4
The emf induced in a coil due to the change of its own flux linked with it is called
B. Dynamically induced emf
C. Statically induced emf
What is the correct answer?
4
The permeability of permalloy is
A. Very much greater than permeability of air
B. Slightly greater than permeability of air
C. Slightly less than permeability of air
D. Equal to the permeability of air