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Doctors Medicines MCQs Q&A

  1. Only (ii) is correct
  2. (i) and (iii) both are correct
  3. (ii) and (iii) both are correct
  4. Only (i) is correct
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1 Answers

Option 3 : (ii) and (iii) both are correct

The correct answer is .(ii) and (iii) both are correct

Concept:

Electric motor:

  • An electric motor is a device that converts electrical energy to mechanical energy.
  • Principle:- It is based on the principle that when a current-carrying conductor is placed in a magnetic field perpendicular to it, it experiences a force.

Explanation:

Parts of an Electric Motor:

  • Power Source: A simple motor usually has a DC power source. It supplies power to the motor armature or field coils.
  • Armature Coil: A rectangular coil ABCD. 
  • Field Magnet: The magnetic field helps to produce a torque on the rotating armature coil by virtue of Fleming’s left-hand rule.
  • Armature Core: Holds the armature coil in place and provides mechanical support.
  • Commutator or Split ring: Two disjoint C-shaped rings P and Q. It acts as a commutator (which can reverse the direction of the current).
  • Brushes: It is a device that conducts current between stationary wires and moving parts, most commonly the rotating shaft.

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Statement  True/ false
i. Which converts mechanical energy into electrical energy. False
ii. which converts electrical energy into mechanical energy. True 
iii. In which split-ring is used. True 

Only statements ii. and iii. are correct.

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