Answered: Q2 ) I. What is the effect of changing…

Q2 ) I. What is the effect of changing the sequence of phases in the electric feeder (single phase, three-phase) motor? How do you correct the defect if necessary?

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter30: Dc Motors

Section: Chapter Questions

Problem 3RQ

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Concept explainers

Winding and Constructions

Alternating Current (AC) winding is generally of the 3-phase type due to the inherent advantages of the 3-phase machine. Armature coils must be connected to the yield balance (equivalent in magnitude and 2/3 of the series phase difference of the rod) 3-phase electromotive forces (emf). The armature should be divided into step-bands to start with slots around the perimeter.In the construction of AC machines, the frame is used as an external protective shield to protect it from environmental conditions. The frame also serves as the outer perimeter, allowing the interior to be easily placed. The static state section of the devices is the stator winding attached stator.

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Q2 ) I.
What is the effect of chang ing the sequence of
phases in the electric feeder (single phase, three-phase)
motor? How do you correct the defect if necessary?

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Skewing of rotor conductors in a squirrel cage induction motor reduces a. heat developed while rotating b. Vibrations while rotating c. friction while rotating d. humming noise while rotating
Shunt generator will build up its voltage when: Olts field resistance higher than critical value. Olts field resistance is less than critical value.
Q2 (a) Explain, using phasor diagrams, what happens to a synchronous motor as its load is varied.
23. When the circuit breaker is always tripping, most likely There is an overloading c. The supply line are open a. b. There is an over current d. The load is removed 24. The synchronous motor is not inherently self- starting because the rotating magnetic field does not have enough poles b. the rotating magnetic field is produced by only 50 HZ frequency currents the force required to accelerate the rotor is to the synchronous speed in an instant is d. the starting devices to accelerate the rotor to near synchronous speed is absent 25. Synchronous motor has speed a. slight drop in speed on full load b.high speed at low torque а. с. c. constant speed d. low speed at high -
1- b)Does a DC motor's full-load speed have to be the same as its no-load speed in order for it to be classified as a "constant speed" motor? a) yes b) no c). The voltage produced by the generator action of a rotating DC motor is called a) counter-electromotive force (CEMF) b) back-EMT' c) either "a" or "b" d) neither "a" nor "b" d). Which of the following is/are a factor that will determine the amount of back-EMF generated by the generator action of a DC motor? a) number of armature conductors b) number of lines of flux (flux density) c) the speed at which the conductors are cutting the lines of flux (rate of incidence) d) all of the above
A. The DC motor in Figure 1 on Worksheet 8 is a a) cumulatively connected short-shunt compound DC motor b) cumulatively connected long-shunt compound DC motor c) differentially connected short-shunt compound DC motor d) shunt DC motor B. The DC motor in Figure 2 on Worksheet 8 is a a) cumulatively connected short-shunt compound DC motor b) cumulatively connected long-shunt compound DC motor c) differentially connected short-shunt compound DC motor d) shunt DC motor
If a synchronous machine is used as a motor. Which voltage is higher? The phase or the induced voltage? How so?
7. A 4-pole, 500V shunt motor has 720 wave connected conductors on its armature. The full-los armature current is 60A and flux per pole is 0.03 Wb. The armature resistance is 0.020 and th contact drop per brush is 1V. then the full-load speed of the motor is -- a) 675 r.p.m. b) 690 r.p.m. c) 705 r.p.m. d) none of the previous,
1. A three phase, 10 pole, 60 cycle IM has a full load slip of 0.075. What is the speed of: a. the rotor relative to the revolving field? ( 54 RPM) b. the revolving field relative to the stator? ( 720 rpm)
Q2 (a) Explain, using phasor diagrams, what happens to a synchronous motor as its field current is varied.
Can you solve part C.
DEGREE: ELECTRICAL ENGINEERING SUBJECT/COURSE: AC MACHINES Answer the following questions (A, B and C) depending on the topic. 1. SYNCHRONOUS MOTORS A. What is necessary to start a synchronous motor to rotate from standstill? Describe the process. B. What is meant by synchronous condenser? C. Why is it possible for synchronous motors be used as a power factor correction device and what applications do synchronous motors commonly used? Describe the operation.