Answered: E-a). Which of the following is/are a…

E-a). Which of the following is/are a type of single-phase multi-speed motor? a) consequent-pole motor b) shaded-pole induction motor c) both "a" and "b" d) neither "a" nor "b"

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter33: Single-phase Motors

Section: Chapter Questions

Problem 6RQ: On average, how many degrees out of phase with each other are the start- and run-winding currents in...

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Concept explainers

Three Phase Induction Motor

The induction motor is an electric motor that runs on AC (alternating current) and it is of two type single phase motor that work on single-phase power supply and three-phase motor that work on three-phase power supply.

Question

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E-a). Which of the following is/are a type of single-phase multi-speed motor? a) consequent-pole motor b) shaded-pole induction motor c) both "a" and "b" d) neither "a" nor "b"
E-b). The lower the speed setting, the_________ the impedance of run winding in a single-phase multi-speed motor.
a) lower b) higher c) either "a" or "b" d) neither "a" nor "b"
E-c)The rotor of a single-phase repulsion motor gets its voltage
a) by induction b) direct wired from an external AC source c) direct wired from an external DC source d) all of the above

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Q3) I. What' s the effect of The auxiliary winding of split - phase induction motor when it becomes short circuit ?
B- 1 As the name implies, a 3-phase "dual-voltage motor" can be connected to one of two voltages. a) true b) false B-2 - A 3-phase dual-voltage motor may have_______leads. a) nine b) twelve c) either "a" or "b" d) neither "a" nor "b" B-3-Which of the following mathematically represents the relationship between Ete phase and line voltages of a WYE connected 3-phase motor? a) EPHASE = ELINE ÷ 1.732 b) ELINE = EPHASE x 1.732 c) ELINE = EPHASE X√3 d) all of the above
C-a). The speed of a single-phase shaded-pole motor is determined by the _________________ . a) frequency of the supply b) number of poles on the stator c) both "a" and "b" d)_ neither "a" nor "b" C-b).. The single-phase shaded-pole motor has low______ torque. a) starting b) running c) both "a" and "b" d) neither "a" nor "b" C-c). The single-phase shaded-pole motor is considered nonreversible. a) true b) false
A “Three Phase Induction Motor” is a very popular electrical Motor used in many types of industries because of _____. a. Simple construction b. Less maintenance. c. All of the Choices d. Low cost
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The load resistance referred to stator is____ for the induction motor with slip 1% and rotor resistance is 2 ohms. a.100 ohms b.158 ohms c.98 ohms d.198 ohm
B-a). A shaded-pole induction motor's rotating magnetic field is created by ___________ .a) multiple coils connected in parallel on the stator b) a capacitor connected in series with the starting windings c) a shading coil d) none of the aboveB-b). A shading coil of a single-phase shaded pole motor is designed_____________ to magnetic flux. a) concentrate b) oppose a change in c) enhance d) all of the above B-c).The shading coil of a single-phase shaded-pole motor has no influence when the current through the stator windings is at_________ electrical degrees. a) 0, 180, & 360 b) 90 & 180 c) 90 & 270 d) none of the above
5-Which of the following statements regarding single phase induction motors correct? (a) It requires only one winding. (c) It is self-starting. (b) It can rotate in one direction only. (d) It is not self-starting.
- Reconnecting Induction Motors 6.a. The voltage in a 460-volt motor is changed to 425 volts. If the original torque was 125 lb-ft, the newtorque isA. 135 lb-ft.B. 117 lb-ft.C. 115 lb-ft.D. 107 lb-ft.6.b. If a 575-volt three-phase motor originally connected in 3-parallel △ is reconnected in 5-parallel Y, thenew voltage isA. 501 volts.B. 794 volts.C. 598 volts.D. 747 volts.
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