Q.1
The most suitable servo-motor application is __________
  • AC series motor
  • DC series motor
  • AC two-phase induction motor
  • DC shunt motor
Q.2
Which of the following methods is used to control speed ofkV,Hz singlephase traction ?
  • Reduced current method
  • Tap changing control of transformer
  • Series parallel operation of motors
  • All of the above
Q.3
Which of the following methods is used to control speed ofkV,Hz singlephase traction ?
  • Reduced current method
  • Tap changing control of transformer
  • Series parallel operation of motors
  • All of the above
Q.4
For which of the following locomotives the maintenance requirements are theleast?
  • Steam locomotives
  • Diesel locomotives
  • Electric locomotives
  • Equal in all of the above
Q.5
When a bogie negotiates a curve, reduction in adhesion occurs resulting in sliding.Thus sliding is acute when
  • wheel base of axles is more
  • degree of curvature is more
  • both (A) and (B)
  • none of the above
Q.6
Series motor is not suited for traction duty due to which of the following account ?
  • Less current drain on the heavy load torque
  • Current surges after temporary switching off supply
  • Self relieving property
  • Commutating property at heavy load
Q.7
Series motor is not suited for traction duty due to which of the following account ?
  • Less current drain on the heavy load torque
  • Current surges after temporary switching off supply
  • Self relieving property
  • Commutating property at heavy load
Q.8
Locomotive having monomotor bogies
  • has better coefficient of adhesion
  • are suited both for passanger as well as freight service
  • has better riding qualities due to the reduction of lateral forces
  • has all above qualities
Q.9
In main line service as compared to urban and suburban service
  • distance between the stops is more
  • maximum speed reached is high
  • acceleration and retardation rates are low
  • all of the above
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