Join 60,000+ competitive exam aspirants
or with email
Your Cart
SubtotalтВ╣0
TotalтВ╣0
Examoogle тАв User тАв info@examoogle.com тАв EE-2024-8821
Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
Join 60,000+ competitive exam aspirants
Which of the following motors will be used in electric clocks
shunt motor
series motor
induction motor
synchronous motor
synchronous motor
The correct answer is D (synchronous motor) because synchronous motors maintain a constant speed that is synchronized with the frequency of the power supply, making them suitable for timing applications like electric clocks.
The correct answer is D (synchronous motor) because synchronous motors maintain a constant speed that is synchronized with the frequency of the power supply, making them suitable for timing applications like electric clocks.
╧Й=2╧Аf тАФ Calculate the angular velocity of the rotor.
NsтАЛ=P120fтАЛ тАФ Calculate synchronous speed, where NsтАЛ is in RPM, f is frequency in Hz, and P is number of poles.
Synchronous motors operate on the principle that the rotor rotates at the same speed as the magnetic field produced by the stator. This synchronization is achieved because the rotor is designed to follow the rotating magnetic field, which ensures stable and accurate timing necessary for applications like electric clocks.
Synchronous motors have constant speed under varying load conditions.
They are more efficient for constant speed applications like clocks.
High efficiency
Stable speed under varying loads
More complex control system
Higher initial cost
Electric clocks
Synchronous generators
Synchronous motors are preferred in applications requiring precise timing and constant speed.
Option A is incorrect because shunt motors have variable speeds and are not suitable for precise timing.
D is correct тАФ Synchronous motors are used for electric clocks due to their ability to maintain a constant speed in synchronization with the electrical supply.
Remember that timing devices like clocks require stability and precision, which is why synchronous motors are the optimal choice.