Load Torques that Depend on the Path or Position Taken by the Load During Motion MCQ

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• 250V, 15A, 1100 rpm separately excited dc motor with armature resistance (R
  ক

  equal to 2 ohms. Calculate back emf developed in the motor when it operates on half of the full load. (Assume rotational losses are neglected) ] 210V

  খ

  240V
• Torque is a scalar quantity.
  ক

  True

  খ

  False
• If the starting torque of the motor is less than the load torque, the motor will fail to start.
  ক

  True

  খ

  False
• Buck converter is used to _________
  ক

  Step down the voltage

  খ

  Step up the voltage

  গ

  Equalize the voltage

  ঘ

  Step up and step down the voltage
• Calculate the value of the torque when 10 N force is applied perpendicular to a 10 m length of rod fixed at the center.
  ক

  200 N-m

  খ

  300 N-m

  গ

  100 N-m

  ঘ

  400 N-m
• The unit of the torque is ______
  ক

  N-m

  খ

  N-m2

  গ

  N-m/sec

  ঘ

  N-Hz
• Force resisting the upward motion of a body on an inclined plane is given by (alpha – the angle of inclination, W- the weight of the body).
  ক

  F = W×sin(alph] c) F = W×sec(alph] d) F = W×cos(alph] View Answer]

  খ

  F = W×cosec(alpha)

  গ

  F = W×sec(alpha)

  ঘ

  F = W×cos(alpha)
• What is the empirical formula for the tractive force required to overcome curve resistance? (W-the weight of the body, R – radius of curvature)
  ক

  710×W÷R

  খ

  700×W÷R

  গ

  720×W÷R

  ঘ

  750×W÷R