Question 493Electricity & Electronics - QMED
70% to passAn increase in which of the listed conditions will increase the speed of a synchronous electric motor?
AInductance
BVoltage
CArmature current
DFrequency
AI Explanation
The correct answer is D) Frequency. The speed of a synchronous electric motor is directly proportional to the frequency of the alternating current (AC) supply. Increasing the frequency of the AC supply will result in an increase in the speed of the synchronous motor, as the motor's rotor will rotate faster to keep up with the changing magnetic field. The other options are incorrect because: A) Inductance affects the power factor of the motor, but does not directly impact the speed. B) Voltage changes can affect the torque of the motor, but do not directly influence the speed. C) Armature current changes can impact the torque, but not the speed, of a synchronous motor.
Related Questions
Q213:If an induction motor were to be operated at 90% rated voltage and at rated load... Q15:Which of the following precautions should be taken when a blown fuse, rated at 1... Q39:Four lamps are connected in parallel in a single circuit. If one of the lamps bu... Q208:In a 15 HP induction-type motor with a squirrel-cage rotor, compared to the full... Q364:Which of the pictured solid-state semiconductor devices in the illustration is a...
Ready to test your knowledge?
Take a Electricity & Electronics - QMED Practice ExamOfficial Resources