Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN: 9780133923605
Author: Robert L. Boylestad
Publisher: PEARSON
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Calculate the speed of an 8-pole synchronous motor operating at a.) 50 Hz and b.) 60 Hz
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- A decrease in the field current of a synchronous motor results in: O A. Power factor of the machine will increase O B. Decreasing the induced voltage; motor will absorb more reactive power O C. No change in the induced voltage O D. Increasing the induced voltage; motor will absorb more reactive power O E. None of the other choices are correctarrow_forward5. A stepper motor has a resolution of 500 steps/rev in the 1-phase-ON mode of operation. If it is operated in half-step mode, determine (a) resolution (b) number of steps required to turn the rotor through 72°. [(a) 1000 steps/rev (b) 200]arrow_forward22. A) Why is the power factor of a lightly loaded 3-phase squirrel-cage induction motor very low? a) most of the power supplied to the motor at light loads is magnetization or inductive power b) most of the power supplied to the motor at light loads is resistive power c) most of the power supplied to the motor at light loads is capacitive power d) none of the above B) What happens to the power factor as load is increased on the motor? a) the power factor increases b) the power factor deceases c) remains the samearrow_forward
- 18. What is the frequency on the rotor of a 3-phase squirrel-cage induction motor, when the rotor is at a standstill with the stator excited? a) equal to stator frequency b) equal to stator frequency times percent slip c) equal to zero d) none of the abovearrow_forward2. A) Which of the following 3-phase motors has a wire wound rotor? a) polyphase induction motor b) polyphase wound rotor motor c) both "a" and "b" d) neither "a" nor "b" B) Which of the following 3-phase motors has a more maintenance free design. a) 3-phase wire wound rotor b) 3-phase squirrel-cage rotorarrow_forward7. An overexcited synchronous motor behaves like: A. Inductive load B. Resistive load C. Capacitive load D. DC generator 8. The amount of real power delivered by a synchronous generator connected to an infinite bus can be controlled by adjusting A. System frequency C. Full load frequency B. No load frequency D. Terminal voltage 9. The rotation speed of a 60 Hz, 24 pole synchronous generator is А. 1200 грm С. 300 грm В. 900 грm D. 500 грm 10. The frequency of the instantaneous power in a single phase 50 Hz power system is A. 100 Hz С. 50 Hz В. 60 Hz D. 120 Hzarrow_forward
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