Hi friends, these are some of the multiple choice questions on electrical and magnetic properties. These are some of the basic questions which are asked in previous competitive papers check out and comment...
l) What bond is formed when one or more electrons in the outermost energy orbit of an atom are transferred to another?
A) Ionic
B) Covalent
C) Metallic
D) Van der Waals
Ans:A
2) 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
Ans:A
3) What bond is formed when electrons in the outermost energy orbits of the atoms are shared between two or more electrons?
A) Ionic
B) Covalent
C) Metallic
D) Van der Waals
Ans:B
4) Why is it t hat the magnitude of magneto motive force required for air gap is much greater than that required for iron part of a magnetic circuit?
A) Because air is a gas
B) Because air has the highest relative permeability
C) Because air is a conductor of magnetic flux
D) Because air has the lowest relative permeability
Ans:D
5) What type of bond is formed When there exists some form of collective interactions between the (negatively charged) electrons and (positively charged) nuclei in a solid?
A) Ionic
B) Covalent
C) Metallic
D) Van der Waals
Ans:C
6) Permeance of a magnetic circuit is the cross-sectional area of the circuit.
A) directly proportional to
B) inversely proportional to
C) dependent of
D) independent of
Ans:A
7) Formed when there exist distant electronic interactions between (opposite) charges present in the neighboring atoms or molecules.
A) Ionic bond
B) Covalent bond
C) Metallic bond
D) Van der waals bond
Ans:D
8) 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)
Ans:A
9) A factor used to correct for the electrostatic forces of the more distant ions in an ionic solid.
A) Avogadro’s number
B) Planck’s constant
C) Boltzmann’s constant
D) Madelung constant
Ans:D
10) The conduction of electricity across the surface of a dielectric is called
A) creepage
B) skin effect
C) surface effect
D) crosstalk
Ans:A
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l) What bond is formed when one or more electrons in the outermost energy orbit of an atom are transferred to another?
A) Ionic
B) Covalent
C) Metallic
D) Van der Waals
Ans:A
2) 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
Ans:A
3) What bond is formed when electrons in the outermost energy orbits of the atoms are shared between two or more electrons?
A) Ionic
B) Covalent
C) Metallic
D) Van der Waals
Ans:B
4) Why is it t hat the magnitude of magneto motive force required for air gap is much greater than that required for iron part of a magnetic circuit?
A) Because air is a gas
B) Because air has the highest relative permeability
C) Because air is a conductor of magnetic flux
D) Because air has the lowest relative permeability
Ans:D
5) What type of bond is formed When there exists some form of collective interactions between the (negatively charged) electrons and (positively charged) nuclei in a solid?
A) Ionic
B) Covalent
C) Metallic
D) Van der Waals
Ans:C
6) Permeance of a magnetic circuit is the cross-sectional area of the circuit.
A) directly proportional to
B) inversely proportional to
C) dependent of
D) independent of
Ans:A
7) Formed when there exist distant electronic interactions between (opposite) charges present in the neighboring atoms or molecules.
A) Ionic bond
B) Covalent bond
C) Metallic bond
D) Van der waals bond
Ans:D
8) 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)
Ans:A
9) A factor used to correct for the electrostatic forces of the more distant ions in an ionic solid.
A) Avogadro’s number
B) Planck’s constant
C) Boltzmann’s constant
D) Madelung constant
Ans:D
10) The conduction of electricity across the surface of a dielectric is called
A) creepage
B) skin effect
C) surface effect
D) crosstalk
Ans:A
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