EBK DELMAR'S STANDARD TEXTBOOK OF ELECT
6th Edition
ISBN: 9780100546684
Author: Herman
Publisher: YUZU
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Question
Chapter 31, Problem 11RQ
To determine
The type of compound-motor connection that should be avoided.
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Q2: Choose TRUE or FULSE:
1-The series filed of a short- shunt dc generator is excited by armature current.
2- The developed power in DC generator amature in mechanical power.
3- The 1- phase transformer is costly than 3- phase transformer.
4- The series de generators are rarely due to low overall efficiency.
5-The armature coils has cross section greater than field coils in DC shunt generators.
6- The speed of DC machines inversely proportional to number of poles.
7-Short circuit test used to determine core loss of transformers.
8- Maximum efficiency can be obtained when copper loss equal to constant loss.
9- If the field current circuit of DC shunt generator is opened, there will no induced
voltage in armature winding.
10-If the transformation ratio greater than 1, the transformer called step-up transformer.
What is armature and reaction, how does armature reaction affect alternator voltage according to load load type? explain
Which of the following factor is responsible for negative
voltage regulation of a DC generator?
Under compunding
Over compounding
Flat compounding
Critical resistance
Chapter 31 Solutions
EBK DELMAR'S STANDARD TEXTBOOK OF ELECT
Ch. 31 - Prob. 1RQCh. 31 - Prob. 2RQCh. 31 - Prob. 3RQCh. 31 - Prob. 4RQCh. 31 - What type of motor is known as a constant-speed...Ch. 31 - What is CEMF?Ch. 31 - Prob. 7RQCh. 31 - Prob. 8RQCh. 31 - Prob. 9RQCh. 31 - What type of motor should never be operated at no...
Ch. 31 - Prob. 11RQCh. 31 - What is the most common way of changing the...Ch. 31 - Prob. 13RQCh. 31 - Prob. 14RQCh. 31 - What device is used to disconnect power to the...Ch. 31 - Prob. 16RQCh. 31 - Who was the first person to establish a...Ch. 31 - One horsepower is equal to how many W?Ch. 31 - A motor is operating a load that requires a torque...Ch. 31 - The motor in Question 19 is connected to a 250-VDC...Ch. 31 - Prob. 1PA
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- Define the working of the DC generator with the properly labelled diagrams.arrow_forwardMultiple Choice Choose the correct answer from the choices. Disregard my chosen answer.arrow_forwardQ1) Answer the following: - 1-E = (V – laRa ) then N = 2-The consist of and N 3-In a the shunt field winding is connected in parallel with the armature winding only. Series Field Shunt Field R Re 4- The Vo is adjusted by adding This increase slope of this line causing the operating point to shift at lower voltage. No Load V prime mover certain speed. 5-for wave wound generator A= , and for lap wound generator A= 6-The is made up of insulated 7- The connection arrangement to obtain shunt or series excited generators, the field winding is disconnected from the machine and connected across an external supply. is as shown in the figure below. For UC No Supply Load field winding constant speed wwwarrow_forward
- (B)- Indicate whether the following statements are true or false and correct the false statements - In series d-c generator the field winding will be constructed from high number of turns and high cross-sectional area of wire. A de generator beyond critical resistance will generate maximum voltage In DC machines internal characteristics are plotted between E, vs load current 4- shunt generators are used in arc welding 5- Armature resistance control method is used for the below rated speed 4 +-arrow_forward(B)/ Explain briefly the following Why the armature is connected as LAP winding with high torque low speed motor application What is the main advantage of shunt motor over series motor? P 3- Mention the difference between core and shell type transformers What are the reasons for providing compensating windings in a d.c. generator?arrow_forwardDraw the circuitarrow_forward
- QUESTION 2 (5) To minimize the effect of armature reaction and keep the field lines straight between the poles of a DC motor or generator a(n) is added in with the winding.arrow_forwardA short-shunt compound wound generator has a shunt field resistance of 77 ohms, a series field resistance of 0.008 ohms, a commutating pole winding resistance of 0.005 ohms, and an armature resistance including brushes of 0.02 ohms. When the armature current is 128 amperes, the generated emf is 234.5 volts. Calculate the power delivered to the load. note: A commutating pole winding is connected in series with the armature winding.arrow_forwardSolve question no.12 and show a clear and readable solution.Note: The answer is given on the bottom right side of the image, just show the solution on how to get it. The value of resistances are also given on the image.Thanks!!!arrow_forward
- A 6-pole, lap-wound, DC generator has a useful flux per pole of 0.08 Wb. The armature winding consists of 200 turns and the resistance is 0.055 ohms. Calculate the terminal voltage if the resistance of shunt and series field are 100 ohms and 0.02 ohms respectively, when the generator is running at 1000 rpa. Assume generator connection as short-shuntb. Assume generator connection as long-shuntarrow_forward3- How can the speed effect. on the N.L chara. And the external chara. Of the shunt generator?arrow_forwardA shunt DC generator has no load terminal voltage of 140V. Armature resistance is 1ohm and shunt field resistance is 50ohms. Calculate: (i) Induced voltage (ii) A load is now connected to the terminals that starts drawing 2A current and terminal voltage drops to 130V. Calculate the new value of the induced voltage Make sure to draw equivalent circuits for (i) and (ii)arrow_forward
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