☰ Synchronous Machines (Electrical Engineering) - MCQs

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Q19.

electrical machines (AC) should have proper ________ in order to limit the operating temperature

  • A. voltage rating
  • B. current rating
  • C. speed
  • D. kW rating
    ✍ Discuss    
Q20.

a pony motor is basically a

  • A. small induction motor
  • B. DC series motor
  • C. DC shunt motor
  • D. double winding AC/DC motor
    ✍ Discuss    
Q21.

in a synchronous machine, hunting is predominantly damped by

  • A. mechanical losses in the rotor
  • B. iron losses in the rotor
  • C. copper losses in the stator
  • D. copper losses in the rotor
    ✍ Discuss    
Q22.

during hunt of synchronous motor

  • A. negative phase sequence currents are generated
  • B. harmonics are developed in the armature circuit
  • C. damper bar develops torque
  • D. field excitation increases
    ✍ Discuss    
Q23.

armature reaction in a synchronous motor at rated voltage and zero power factor is

  • A. magnetising
  • B. cross magnetising
  • C. both magnetising and cross magnetising
  • D. demagnetising
    ✍ Discuss    
Q24.

stability of a synchronous motor _________ with the increase in in excitation

  • A. increases
  • B. decreases
  • C. remains unaffected
  • D. remains affected
    ✍ Discuss    
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➣ DC Basics and Networks ➣ Electromagnetic Field Theory ➣ Electrical Engineering Material ➣ DC Machines ➣ Induction Machines ➣ Electrical Machine Design ➣ AC Basics and Networks ➣ Transmission and Distribution of Electrical Power ➣ Electrical Energy Utilisation and Electric Traction ➣ Electrical Installation and Wiring ➣ Basic Electronics Engineering ➣ Analog Electronics ➣ Digital Electronics ➣ Microprocessors ➣ Electronic and Electrical Measurements and Instruments
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