Electronics Engineering MCQs [Quiz 29]

Q1. One weber of flux is equal to                     magnetic lines of force.
A. 10^6
B. 10^10
C. 4n × 10^7
D. 10^8

Q2. The unit of flux density is
A. Wb/m
B. Tesla
C. At/m
D. N/Wb

Q3. 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

Q4. Magnetic field intensity is a                    quantity.
A. scalar
B. phasor
C. vector
D. variable

Q5. 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

Q6. The relative permeability of a magnetic material is 10^5. What is its permeability?

A. 4n × 10^5 H/m
B. 4n × 10^-12 H/m
C. 4v × 10^-2 H/m
D. 4n × 10^-7 H/m

Q7. Which of the following has the highest permeability?
A. Soft iron
B. Steel
C. Air
D. Permalloy

Q8. A magnetic pole produces 5000 field lines. How much is the flux in webers?
A. 50 × 10^-6
B. 5 × 10^-6
C. 500 × 10^-6
D. 500 × 10^-5

Q9. As the magnetic intensity decreases, the relative permeability of a magnetic material
A. decreases
B. remains the same
C. increases
D. becomes zero

Q10. 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 × 10^-5 N/Wb
B. 500 × 10^3 N/Wb
C. 4n × 10^-7 N/Wb
D. 4n × 10^7 N/Wb

Updated: 30th July 2019 — 9:06 PM

Leave a Reply