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) A magnetic circuit carries a flux goi in the iron part and a flux (pg in the air gap. What is the leakage coefficient?
A) 𝛗i/𝛗g
B) 𝛗i×𝛗g
C) 𝛗g/𝛗i
D) 𝛗i+𝛗g
Ans:A
2) A law stating that the magnetic susceptibilities of most paramagnetic substances are inversely proportional to their absolute temperatures.
A) Curie's Law
B) Child’s Law
C) CR Law
D) Curie-Weiss Law
Ans:A
3) The reluctance of the magnetic circuit is relative permeability of the material comprising the circuit.
A) directly proportional to
B) inversely proportional to
C) independent of
D) dependent of
Ans:B
4)A law relating between the magnetic and electric susceptibilities and the absolute temperatures Which is followed by ferromagnets, anti ferromagnets, non-polar ferroelectrics, antiferroelectrics and some paramagnets.
A) Curie’s Law
B) Child’s Law
C) CR Law
D) Curie-Weiss Law
Ans:D
5) Theory of ferromagnetic phenomena which assumes each atom is a permanent magnet which can turn freely about its c enter under the influence of applied field and other magnets.
A) Ewing's theory of ferromagnetism
B) Oersted’s ferromagnetism theory
C) Maxwell’s magnetic theory
D) Ampere’s circuital law
Ans:A
6) The reluctance of a magnetic circuit varies with
A) length ×area
B) area ÷ length
C) length ÷ area
D) length + area
Ans:C
7) A theorem which states that an electric current flowing in a circuit produces a magnetic field at external points equivalent to that due to a magnetic shell whose bounding edge is the conductor and whose strength of the current.
A) Joule’s law
B) Faraday’s law
C) Vo1ta’s theorem
D) Ampere's theorem
Ans:D
8) What is the usual value of leakage coefficient for electrical machines?
A) 0.5 to 1
B) 1 to 5
C) 5 to 10
D) 1.15 to 1.25
Ans:D
9) The science of adapting electronics to aerospace flight.
A) Avionics
B) Aerotronics
C) Aerodynamics
D) Astrionics
Ans:D
10) The reluctance of a magnetic circuit is not dependent on which of the following?
A) Number of tums of coil
B) Magneto motive force
C) Flux density in the circuit
D) Current in the coil
Ans:C
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l) A magnetic circuit carries a flux goi in the iron part and a flux (pg in the air gap. What is the leakage coefficient?
A) 𝛗i/𝛗g
B) 𝛗i×𝛗g
C) 𝛗g/𝛗i
D) 𝛗i+𝛗g
Ans:A
2) A law stating that the magnetic susceptibilities of most paramagnetic substances are inversely proportional to their absolute temperatures.
A) Curie's Law
B) Child’s Law
C) CR Law
D) Curie-Weiss Law
Ans:A
3) The reluctance of the magnetic circuit is relative permeability of the material comprising the circuit.
A) directly proportional to
B) inversely proportional to
C) independent of
D) dependent of
Ans:B
4)A law relating between the magnetic and electric susceptibilities and the absolute temperatures Which is followed by ferromagnets, anti ferromagnets, non-polar ferroelectrics, antiferroelectrics and some paramagnets.
A) Curie’s Law
B) Child’s Law
C) CR Law
D) Curie-Weiss Law
Ans:D
5) Theory of ferromagnetic phenomena which assumes each atom is a permanent magnet which can turn freely about its c enter under the influence of applied field and other magnets.
A) Ewing's theory of ferromagnetism
B) Oersted’s ferromagnetism theory
C) Maxwell’s magnetic theory
D) Ampere’s circuital law
Ans:A
6) The reluctance of a magnetic circuit varies with
A) length ×area
B) area ÷ length
C) length ÷ area
D) length + area
Ans:C
7) A theorem which states that an electric current flowing in a circuit produces a magnetic field at external points equivalent to that due to a magnetic shell whose bounding edge is the conductor and whose strength of the current.
A) Joule’s law
B) Faraday’s law
C) Vo1ta’s theorem
D) Ampere's theorem
Ans:D
8) What is the usual value of leakage coefficient for electrical machines?
A) 0.5 to 1
B) 1 to 5
C) 5 to 10
D) 1.15 to 1.25
Ans:D
9) The science of adapting electronics to aerospace flight.
A) Avionics
B) Aerotronics
C) Aerodynamics
D) Astrionics
Ans:D
10) The reluctance of a magnetic circuit is not dependent on which of the following?
A) Number of tums of coil
B) Magneto motive force
C) Flux density in the circuit
D) Current in the coil
Ans:C
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