Quiz  /  Electrical Drives Gate & PSU MCQ Questions With Answers

  • 1. 
    Armature Voltage control gives speed control

  • below base speed
  • above base speed
  • near 0 speed
  • near maximum possible speed

  • 2. 
    Which type of braking can be used for saving energy?

  • dynamic
  • plugging
  • regenerative

  • 3. 
    In electric train which motor is used

  • DC Series MOTOR
  • DC Shunt MOTOR
  • INDUCTION MOTOR
  • SYNCHRONOUS MOTOR

  • 4. 
    The field of an induction motor rotor rotates relative to the stator at

  • a) Rotor speed
  • b) Synchronous speed
  • c) Slip speed
  • d) Very low speed

  • 5. 
    The load emf E must be reversed for

  • first and second quadrant operation
  • third quadrant operation
  • fourth quadrant operation
  • both third and fourth quadrant operation

  • 6. 
    The concept of V/f control of inverters driving induction motors resuls in

  • constant torque operation
  • speed reversal reduced
  • magnetic loss
  • hormonic elimination

  • 7. 
    In regenerative braking of dc shunt motor

  • Eb=V
  • Eb
  • Eb>V
  • None of the above

  • 8. 
    FORWARD MOTORING mode gives

  • positive power
  • negative power

  • 9. 
    In __________ drive each machine is driven by its own separate motor with the help of gears and pulley

  • Individual drive
  • Multimotor drive
  • Group Drive
  • None of the above

  • 10. 
    The basic elements of a electric drive are

  • electric motor.
  • control system.
  • electrical motor and control system.
  • none of the above

  • 11. 
    The function of power modulator isregulate the power flow from source to the motor to enable the motor todevelop the torque speed characteristics required by the load

  • True
  • False

  • 12. 
    The drawback of speed control of a slip ring induction motor with the help of resistance in the circuit is that

  • a) It is applicable only to motors having power of more than 100 kW
  • b) It results in high losses
  • c) With reduction in speed, the torque decreases significantly
  • d) The speed can be controlled only very broadly

  • 13. 
    Steady state equilibrium point means operating conditionat which

  • LOAD TORQUE= MOTOR TORQUE
  • LOAD TORQUE GREATER THAN MOTOR TORQUE
  • LOAD TORQUE LESS THAN MOTOR TORQUE
  • NONE of the above

  • 14. 
    For the first quadrant operation of type E chopper

  • Only CH1 is on
  • CH1 and CH2 is on
  • CH1 and CH3 is on
  • CH1 and CH4 is on

  • 15. 
    In motoring mode slip s

  • greater than 1 and less than2
  • greater than 0and less than1
  • negative
  • none of the above

  • 16. 
    For a type E chopper, when CH2 is first on and then switched off then the

  • power flows from source to load
  • power flows from load to source
  • load is short circuited
  • none of the mentioned

  • 17. 
    IN Regeneration mode, power flow is from

  • Load to Source
  • Source to load

  • 18. 
    Drives are nothing but

  • power electronics
  • motors
  • controllers
  • combination of all

  • 19. 
    What is the expression for load voltage when the chopper is operated in the second quadrant?

  • Vs
  • E
  • 0
  • E + Ldi/dt

  • 20. 
    The process of converting Fixed DC voltage into variable DC Voltage is called as-------------------------

  • Chopper
  • Inverter
  • Rectifier
  • Cycloconverter
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