Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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You are working as a plant electrician. You are told that a large DC motor was returned from the rewind shop and was installed on the previous shift. The motor seemed to operate properly until load was added. The motor then stopped, reversed direction, and began to run at high speed. What is the probable cause of the trouble, and what would you do to correct the problem? Explain your answer.
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 -
Q2: b- Explain how does the three- phase induction motor work? *
Chapter 30 Solutions
Delmar's Standard Textbook Of Electricity
Ch. 30 - Prob. 1RQCh. 30 - Prob. 2RQCh. 30 - Prob. 3RQCh. 30 - Prob. 4RQCh. 30 - What type of motor is known as a constant-speed...Ch. 30 - What is CEMF?Ch. 30 - Prob. 7RQCh. 30 - Prob. 8RQCh. 30 - Prob. 9RQCh. 30 - What type of motor should never be operated at no...
Ch. 30 - Prob. 11RQCh. 30 - What is the most common way of changing the...Ch. 30 - Prob. 13RQCh. 30 - Prob. 14RQCh. 30 - What device is used to disconnect power to the...Ch. 30 - Prob. 16RQCh. 30 - Who was the first person to establish a...Ch. 30 - One horsepower is equal to how many W?Ch. 30 - A motor is operating a load that requires a torque...Ch. 30 - The motor in Question 19 is connected to a 250-VDC...Ch. 30 - Prob. 1PA
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- I need the answer as soon as possiblearrow_forwardA 50-hp three-phase motor, rated 220 V, 75% power factor has 6 poles. The slip at full load is 3%. What is the frequency of the rotor current at full load? (a). 1.8 Hz (b). 60 Hz (c). 5.4 Hz (d). 58.2 Hzarrow_forwardQ3/ Chose the correct answer for the following 1. Synchronous motors are generally not self-starting because (a) the direction of rotation is not fixed (b) the direction of instantaneous torque reverses after half cycle (c) startes cannot be used on these machines (d) starting winding is not provided on the machines 2. The power developed by a synchronous motor will be maximum when the load angle is (a) Zero (b) 45° (c) 90° (d) 120° 3. An over-excited synchronous motor takes (a) leading current (b) lagging current (c) both (a) and (b) (d) none of the above 4. In a synchronous motor, the magnitude of stator back e.m.f. £& depends on (a) d.c. excitation only (b) speed of the motor (c) load on the motor (d) both the speed and rotor flux 5. A pony motor is basically a (a) small induction motor (c) D.C. shunt motor (b) D.C. series motor (d) double winding A.C./D.C. motorarrow_forward
- 1. It is a machine that converts mechanical energy to electrical energy. 2. It is a machine that converts electrical energy to mechanical energy. 3. It is cylindrical or drum-shaped where the coils are placed and can either be lap wounded or wave wounded. 4. It connects the commutator to the other parts of the DC machine. 5. It serves as the housing of the dc machine. 6. True or False: The shunt field winding is part of the armature. 7. True or False: The long shunt compound generator is when the armature is in series with the series field winding and parallel to the shunt field winding. 8-10. Your newly built house needs an elevator. Which from the following will be best to use- series, shunt or compound motor and why?arrow_forwardANSWER ALL THE QUESTIONS: A.) Calculate the voltage induced in the armature winding of a 4 pole, wave-wound, dc machine having 728 active conductors and running at 1800rpm. The flux per pole is 30mWb. 1310.4V 468.2 V 720.4 V 236.4 V B.) The direction of rotation of a DC motor is reversed by reversing armature connections adding resistance to the field circuit interchanging the armature and field connection reversing supply connectionarrow_forwardQ choose the correct answer: 1-Brushless excitation system consisting of.... a- Stator field winding and power diodes b-stator and rotor field winding and capacitor c- stator and rotor field winding and capacitor d- Everything mentioned in the options 2- Voltage generated per phase in an alternator is proportional to a- Flux per pole b- Number of turns in armature c-Winding factors d- Everything mentioned in the options e- Frequency of waveform 3- If input mech. Power of SG constant, the functionality of AVR is a- Control flux of rotor b-Control terminal voltage c- Control flux and terminal voltage d-Control Load anglearrow_forward
- The factors effecting the speed of dc motor are The flux p and the voltage across the armature the voltage across the armature and the applied voltage V The applied voltage V, flux p and the voltage across the armature none of the aboye Indicate whether the following statement are true or false * True False The distance between the beginnings of each cascaded two coils is called commutator Pitcharrow_forwardA 150 HP, 3-phase, 6 pole, 460 V, 60 Hz induction motor draws 195 A line current at full load speed of 1170 rpm and 0.85 pf. Solve for the percent slip at full load. (a). 2.5% (b). 3.0% (c). 2.8% (d). 2.0%arrow_forwardpls answer it correctly. All the previous answers are always wrong. Correct answer is on the choices using the given information.arrow_forward
- Choose the bestarrow_forwardDEGREE: 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.arrow_forward(B)-ndicate whether the following statements are true or false and correct the faise statements. -When a series d.c. motor is operate without load, the armature will not run. The strength of magnetic field in d.c. shunt generator can be varied by varying the polarity of the field poles The main disadvantage of series generators is Output voltage varies as the Toad varies There is no output from the transformer under short-circuit conditionsarrow_forward
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