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) One weber of flux is equal to magnetic lines of force.
A) 10^6
B) 10^10
C) 4𝚷 X 10^7
D) 10^8
Ans:D
2) The unit of flux density is
A) Wb/m
B) Tesla
C) At/m
D) N/Wb
Ans:B
3) What is the typical saturation flux density for most magnetic materials?
A) 4 Wb/m^2
B) 5 Wb/m^2
C) 1 Wb/m^2
D) 2 Wb/m^2
Ans:D
4) Magnetic field intensity is a quantity.
A) scalar
B) phasor
C) vector
D) variable
Ans:C
5) The force acting on a pole of 5 Wb is 25 N. What is the intensity of the magnetic field?
A) 5 N/Wb
B) 25 N/Wb
C) 125 N/Wb
D) 0.2 N/Wb
Ans:A
6) The relative permeability of a magnetic material is lO”5. What is its permeability?
A) 4𝚷× l0^5 H/m
B) 4𝚷× l0^-12 H/m
C) 4𝚷× l0^-2 H/m
D) 4𝚷× l0^-7 H/m
Ans:C
7) Which of the following has the highest permeability?
A) Soft iron
B) Steel
C) Air
D) permalloy
Ans:D
8) A magnetic pole produces 5000 field lines. How much is the flux in Webers?
A) 50 x 10^-6
B. 5 X 10^-6
C. 500 X 10^-6
D. 500 X 10^-5
Ans:A
9) As the magnetic intensity decreases, the relative permeability of a magnetic material
A) decreases
B) remains the same
C) increases
D) becomes zero
Ans:C
10) 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?
A) 5 X 10^-5 N/Wb
B) 500 X 10^3 N/Wb
C) 4𝛑 X 10^-7 N/Wb
D) 4𝛑 X 10^7 N/Wb
Ans:B
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l) One weber of flux is equal to magnetic lines of force.
A) 10^6
B) 10^10
C) 4𝚷 X 10^7
D) 10^8
Ans:D
2) The unit of flux density is
A) Wb/m
B) Tesla
C) At/m
D) N/Wb
Ans:B
3) What is the typical saturation flux density for most magnetic materials?
A) 4 Wb/m^2
B) 5 Wb/m^2
C) 1 Wb/m^2
D) 2 Wb/m^2
Ans:D
4) Magnetic field intensity is a quantity.
A) scalar
B) phasor
C) vector
D) variable
Ans:C
5) The force acting on a pole of 5 Wb is 25 N. What is the intensity of the magnetic field?
A) 5 N/Wb
B) 25 N/Wb
C) 125 N/Wb
D) 0.2 N/Wb
Ans:A
6) The relative permeability of a magnetic material is lO”5. What is its permeability?
A) 4𝚷× l0^5 H/m
B) 4𝚷× l0^-12 H/m
C) 4𝚷× l0^-2 H/m
D) 4𝚷× l0^-7 H/m
Ans:C
7) Which of the following has the highest permeability?
A) Soft iron
B) Steel
C) Air
D) permalloy
Ans:D
8) A magnetic pole produces 5000 field lines. How much is the flux in Webers?
A) 50 x 10^-6
B. 5 X 10^-6
C. 500 X 10^-6
D. 500 X 10^-5
Ans:A
9) As the magnetic intensity decreases, the relative permeability of a magnetic material
A) decreases
B) remains the same
C) increases
D) becomes zero
Ans:C
10) 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?
A) 5 X 10^-5 N/Wb
B) 500 X 10^3 N/Wb
C) 4𝛑 X 10^-7 N/Wb
D) 4𝛑 X 10^7 N/Wb
Ans:B
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