Torque in DC Machines MCQ

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

• The velocity of the dc machine at the final state is ________
  ক

  E/Bl

  খ

  Bl/E

  গ

  EBl

  ঘ

  None of the mentioned
• Pulsating torque frequency in universal motor is ________
  ক

  2f

  খ

  f

  গ

  f/2

  ঘ

  4f
• For a universal motor, the rated supply current is 10A giving a rated torque of 100 N-m. If a current of 5A is applied, what will be generated torque vary to?
  ক

  250 N-m

  খ

  400 N-m

  গ

  500 N-m

  ঘ

  1000 N-m
• DC Motor torque depends on ________
  ক

  geometry

  খ

  magnetic properties

  গ

  any of the mentioned

  ঘ

  both geometry and magnetic properties of the structure
• The cogging torque is absent in the permanent magnet dc machine is due to ________
  ক

  non-magnetic nature of rotor

  খ

  magnetic nature of rotor

  গ

  absence of ac supply

  ঘ

  any of the mentioned
• If the torque is in the direction of rotation, the DC machine acts as ________
  ক

  generator

  খ

  motor

  গ

  amplidyne

  ঘ

  any of the mentioned
• The simple rotating loop between pole faces connected to a battery and resistor through a switch, the specifications of this machine are radius = 0.5m, length 1m, resistance = 0.3 ohms and magnitude strength = 0.25T is supplied with 120V. What is the steady state angular velocity at no-load?
  ক

  480 rad/s

  খ

  960 rad/s

  গ

  320 rad/s

  ঘ

  490 rad/s
• If the torque induced is zero in the dc machine, it can be said that ____________
  ক

  current is zero

  খ

  flux can be zero

  গ

  current or flux=0

  ঘ

  any of the mentioned
• The simple rotating loop between pole faces connected to a battery and resistor through a switch, the specifications of this machine are radius = 0.5m, length 1m, resistance = 0.3 ohms and magnitude strength = 0.25T is supplied with 120V. What will be the magnitude of the following current at t=0+?
  ক

  400A

  খ

  200A

  গ

  0

  ঘ

  any of the mentioned
• The simple rotating loop between pole faces connected to a battery and resistor through a switch, the specifications of this machine are radius = 0.5m, length 1m, resistance = 0.3 ohms and magnitude strength = 0.25T is supplied with 120V. Suddenly the switch is closed at t=0, what is observed in the circuit?
  ক

  Current will flow but zero induced EMF

  খ

  Current will not flow and zero induced EMF

  গ

  Current will not flow but EMF is induced

  ঘ

  Current will flow and EMF will also be induced
• The torque induced beyond the pole shoes in the DC machine is?
  ক

  0

  খ

  2/pi *phi *i

  গ

  4/pi *phi *i

  ঘ

  none of the mentioned
• What is the principle of torque production in a dc machine?
  ক

  Lorentz’s law

  খ

  Lenz’s law

  গ

  Faraday’s law

  ঘ

  Self inductance