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MCQs

Total Questions : 112 | Page 5 of 12 pages
Question 41. When an electric current flows out of the page, what is the direction of the magnetic field?
  1.    Clockwise
  2.    Anti-clockwise
  3.    Cannot be determined
  4.    Parallel to the current
 Discuss Question
Answer: Option B. -> Anti-clockwise
Answer: (b).Anti-clockwise
Question 42. Permeability of free space is also known as _________
  1.    Magnetic constant
  2.    Electric constant
  3.    Electrostatic constant
  4.    Magnetostatic constant
 Discuss Question
Answer: Option A. -> Magnetic constant
Answer: (a).Magnetic constant
Question 43. The relation between the direction of current and the direction of magnetic field is?
  1.    Same direction
  2.    Opposite direction
  3.    Perpendicular
  4.    Unrelated
 Discuss Question
Answer: Option C. -> Perpendicular
Answer: (c).Perpendicular
Question 44. As the magnetic flux density increases, the reluctance _____________
  1.    Increases
  2.    Decreases
  3.    Remains the same
  4.    Becomes zero
 Discuss Question
Answer: Option B. -> Decreases
Answer: (b).Decreases
Question 45. What happens to the MMF when the magnetic flux decreases?
  1.    Increases
  2.    Decreases
  3.    Remains constant
  4.    Becomes zero
 Discuss Question
Answer: Option B. -> Decreases
Answer: (b).Decreases
Question 46. Calculate the MMF when the magnetic flux is 5Wb and the reluctance is 3A/Wb.
  1.    10At
  2.    10N
  3.    15N
  4.    15At
 Discuss Question
Answer: Option D. -> 15At
Answer: (d).15At
Question 47. Calculate the reluctance when the magnetomotive force is 10A turns and the flux is 5Wb.
  1.    0.5A/Wb
  2.    5A/Wb
  3.    10A/Wb
  4.    2A/Wb
 Discuss Question
Answer: Option D. -> 2A/Wb
Answer: (d).2A/Wb
Question 48. Ohm’s law for magnetic circuits is _________
  1.    F=ϕS
  2.    F=ϕ/S
  3.    F=ϕ²S
  4.    F=ϕ/S²
 Discuss Question
Answer: Option A. -> F=ϕS
Answer: (a).F=ϕS
Question 49. What is a PMMC instrument?
  1.    Permanent moving magnet coil instrument
  2.    Permanent machine magnet coil instrument
  3.    Permanent moving machine coil instrument
  4.    Premature moving magnet coil instrument
 Discuss Question
Answer: Option A. -> Permanent moving magnet coil instrument
Answer: (a).Permanent moving magnet coil instrument
Question 50. B/H curve shows the relationship between?
  1.    Magnetic field strength and magnetic flux
  2.    Magnetic field strength and magnetic flux density
  3.    Current and magnetic flux density
  4.    Voltage and magnetic flux density
 Discuss Question
Answer: Option B. -> Magnetic field strength and magnetic flux density
Answer: (b).Magnetic field strength and magnetic flux density

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