Question 533Electricity & Electronics - Assistant Engineer
70% to passWhat would be the actual rotor speed for a 4-pole three-phase squirrel-cage induction motor operating at 60 Hz if the rotor slip is 3%?
A1746 rpm
B1793 rpm
C1800 rpm
D1854 rpm
AI Explanation
The correct answer is A) 1746 rpm. To calculate the actual rotor speed, we need to use the formula: Actual Rotor Speed = Synchronous Speed x (1 - Slip) Where: - Synchronous Speed = (120 x Frequency) / Number of Poles - Slip = 3% or 0.03 Plugging in the values: - Synchronous Speed = (120 x 60) / 4 = 1800 rpm - Actual Rotor Speed = 1800 x (1 - 0.03) = 1746 rpm The other options are incorrect because: B) 1793 rpm is too high C) 1800 rpm is the synchronous speed, not the actual rotor speed D) 1854 rpm is too high
Related Questions
Q357:Referring to figure "3" of the illustration, what type of logic gate is symboliz...
Q324:As shown in the illustrated block diagram for a distributed automation system, w...
Q263:Assuming that the 3-phase power source has a phase sequence of A-B-C and that th...
Q31:In a series wound motor, the current passing through the field windings also pas...
Q428:Incorrect brush pressure can result in accelerated brush wear on a DC generator....
Ready to test your knowledge?
Take a Electricity & Electronics - Assistant Engineer Practice ExamOfficial Resources
Pass Your Coast Guard Licensing Exams!
Study offline, track your progress, and simulate real exams with the Coast Guard Exams app