Applications of DC Machines MCQ

Test your knowledge with important Applications of DC Machines MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Applications of DC Machines MCQs at Bissoy

• For which of the following operations a DC motor is preferred over an AC motor?
  ক

  Low speed operation

  খ

  High speed operation

  গ

  Variable speed operation

  ঘ

  Fixed speed operation
• Which motor is preferred in highly explosive atmosphere?
  ক

  Air motor

  খ

  Shunt motor

  গ

  Series motor

  ঘ

  Battery operated motor
• Nowadays, DC motor is widely used only in ____________
  ক

  Pumping sets

  খ

  Air compressors

  গ

  Electric traction

  ঘ

  Machine shops
• When an electric train is moving down a hill, the DC motor will operate as ____________
  ক

  DC series motor

  খ

  DC series generator

  গ

  DC shunt motor

  ঘ

  DC shunt generator
• Which type motors are preferred for lathes?
  ক

  DC shunt motors

  খ

  Squirrel Cage induction motor

  গ

  Synchronous motor

  ঘ

  DC Shunt Motors or Squirrel cage induction motor
• DC shunt motor is still used instead of synchronous motor in _____________
  ক

  High speed applications

  খ

  Low speed applications

  গ

  Medium and high-speed applications

  ঘ

  Everywhere
• Which motor has almost replaced DC shunt motor from its applications?
  ক

  Wound-rotor induction motor

  খ

  Differential compound motor

  গ

  Air motor

  ঘ

  Squirrel caged induction motor
• Which of the following motor can replace DC series motor?
  ক

  DC shunt motor

  খ

  Cumulative compound motor

  গ

  Wound-rotor induction motor

  ঘ

  Synchronous motor
• Maximum torque in a DC machine is limited by ______________
  ক

  Commutation

  খ

  Heating

  গ

  Losses other than heating

  ঘ

  Stability
• In world today, around 25% of the motors are manufactured are DC motors.
  ক

  True

  খ

  False
• Separately excited DC generators are still used in _________________
  ক

  Thermal power plants

  খ

  Ward Leonard speed control system

  গ

  Hydro power plant

  ঘ

  In all fields
• Which DC motor is used with flywheel for intermittent light and heavy loads?
  ক

  Series motor

  খ

  Shunt motor

  গ

  Cumulatively compounded motor

  ঘ

  Differentially compounded motor
• Which of the following motors can be used to drive the rotary compressor?
  ক

  DC shunt motor

  খ

  DC series motor

  গ

  Universal motor

  ঘ

  Synchronous motor
• Which of the following load application normally needs starting torque more than the rated torque?
  ক

  Blowers

  খ

  Conveyors

  গ

  Air compressors

  ঘ

  Centrifugal pumps
• Why are the DC motors preferred for traction applications?
  ক

  Torque and speed are inversely proportional to armature current

  খ

  Torque is proportional to armature current

  গ

  Torque is proportional to square root of armature current

  ঘ

  The speed is inversely proportional to the torque and the torque is proportional to square of armature current