Synchronous Motors Mcqs
Synchronous Motors Mcqs, this topic has 122 mcqs, It takes five to ten minutes to complete this free Synchronous Motors Mcqs test. You will see 4 or 5 option of each question. You must choose / think only one option and then press on answer key for check right answer. Practice "Synchronous Motors Mcqs" MCQs and share with your friends, brothers, sisters.
Synchronous Motors Mcqs (Total Quiz: 122)
MCQ: Which of the following methods is used to start a synchronous motor?
- Damper winding
- Star-delta starter
- Damper winding in conjunction with star-delta starter
- Resistance starter in the armature circuit
C
MCQ: In a synchronous motor running with fixed excitation, when the load is increased three times, its torque angle becomes approximately
- one-third
- twice
- thrice
- six times
- nine times
C
MCQ: A synchronous machine with large air gap has______________?
- a higher value of stability limit
- a small value of inherent regulation
- a higher synchronizing power which makes the machine less sensitive to load variations
- all of the above
D
MCQ: To limit the operating temperature an electrical machine should have proper____________?
- voltage rating
- current rating
- power factor
- speed
B
MCQ: When the voltage applied to a synchronous motor is increased, which of the following will reduce?
- Stator flux
- Pull in torque
- Both A. and (b)
- None of the above
D
MCQ: An over excited synchronous motor is used for____________?
- fluctuating loads
- variable speed loads
- low torque loads
- power factor corrections
D
MCQ: Slip rings are usually made of__________?
- carbon or graphite
- brass or steel
- silver or gold
- copper or aluminium
B
MCQ: A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because?
- synchronous motor has no slip
- stator supply is not required to produce magnetic field
- mechanical load on the rotor remains constant
- synchronous motor has large airgap
B
MCQ: Synchronous motors are_____________?
- not-self starting
- self-starting
- essentially self-starting
- none of the above
A
MCQ: Synchronsizing power of a synchronous machine is_____________?
- direcly proportional to the synchronous reactance
- inversely proportional to the synchronous reactance
- equal to the synchronous reactance
- none of the above
B