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MCQs

Total Questions : 112 | Page 4 of 12 pages
Question 31. Magnetic field exists along which of the following?
  1.    Moving charges
  2.    Stationary charges
  3.    Copper
  4.    Iron
 Discuss Question
Answer: Option A. -> Moving charges
Answer: (a).Moving charges
Question 32. Materials having good retentivity are?
  1.    Strong magnets
  2.    Weak magnets
  3.    Temporary magnets
  4.    Permanent magnets
 Discuss Question
Answer: Option D. -> Permanent magnets
Answer: (d).Permanent magnets
Question 33. Magnetomotive force is equal to__________________
  1.    current * number of turns
  2.    current / number of turns
  3.    current / number of turns per unit length
  4.    current * number of turns per unit length
 Discuss Question
Answer: Option A. -> current * number of turns
Answer: (a).current * number of turns
Question 34. When using a fluxmeter, if the flux changes from Φ to -Φ, what happens to the current?
  1.    Becomes zero
  2.    Becomes infinity
  3.    Remains the same
  4.    Reverses
 Discuss Question
Answer: Option D. -> Reverses
Answer: (d).Reverses
Question 35. PMMC instruments can be used as a fluxmeters by _______
  1.    Using a low resistance shunt
  2.    Removing the control spring
  3.    Making the control springs having a large moment of inertia
  4.    Using a high resistance in series
 Discuss Question
Answer: Option B. -> Removing the control spring
Answer: (b).Removing the control spring
Question 36. The ballistic galvanometer is usually lightly damped so that ________
  1.    It can oscillate
  2.    It will remain stable
  3.    Amplitude of the first swing is very large
  4.    Amplitude of the first swing is very small
 Discuss Question
Answer: Option C. -> Amplitude of the first swing is very large
Answer: (c).Amplitude of the first swing is very large
Question 37. Why is the coil of a ballistic galvanometer wound on a non- metallic former?
  1.    To minimise damping when high resistance is connected in series
  2.    To maximise damping when high resistance is connected in series
  3.    To minimise damping when high resistance is connected in parallel
  4.    To maximise damping when high resistance is connected in parallel
 Discuss Question
Answer: Option A. -> To minimise damping when high resistance is connected in series
Answer: (a).To minimise damping when high resistance is connected in series
Question 38. Hysteresis loss is determined from _______
  1.    B/H curve
  2.    H/B curve
  3.    BH curve
  4.    B²H curve
 Discuss Question
Answer: Option C. -> BH curve
Answer: (c).BH curve
Question 39. When a bar magnet is broken into two pieces, which of the following are true?
  1.    The magnet loses its magnetism
  2.    The magnet has only north pole left
  3.    The magnet has only south pole left
  4.    The magnet turns into two new bar magnets
 Discuss Question
Answer: Option D. -> The magnet turns into two new bar magnets
Answer: (d).The magnet turns into two new bar magnets
Question 40. When an electric current flows into 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 A. -> Clockwise
Answer: (a).Clockwise

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