Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 30, Problem 11RQ
To determine
The type of compound-motor connection that should be avoided.
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DC Shunt Generator No-Load Characteristics
Please draw the curves for both cases and mention the scale for each on a graph paper. Please use graph paper only.
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.
A. The DC motor in Figure 3 on Worksheet 8 is aa) 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 motorB. Is the DC motor in Figure 1 on Worksheet 8 turning in the same direction as that in Figure 3?a) yes b) no
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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- Which of the following factor is responsible for negative voltage regulation of a DC generator? Under compunding Over compounding Flat compounding Critical resistancearrow_forwardWhat is armature and reaction, how does armature reaction affect alternator voltage according to load load type? explainarrow_forwardDefine the working of the DC generator with the properly labelled diagrams.arrow_forward
- Q1) 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)/ 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_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
- The windings of short-shunt compound dc generator have the following resistances: Armature, shunt field, interpole and series field are 0.5 ohm, 253 ohms, 0.2 ohm and 0.15 ohm respectively When the generator delivers 40 amperes at 500 Volts, its total drop is 2 Volts. What is the generated power?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_forward3- How can the speed effect. on the N.L chara. And the external chara. Of the shunt generator?arrow_forward
- 2. This question is regarding the steady state armature current when dead short circuit occurs across the d.c generator terminals. Pick up the correct statement. (A) For a shunt generator the short circuit armature current will be many times larger than the rated current of the armature. (B) For a separately excited generator the short circuit armature current will be many times larger than the rated current of the armature. (C) For a shunt generator the short circuit armature current will be many times lower thanthe rated current of the armature. (D) For a separately excited generator the short circuit armature current will be many times lower than the rated current of the armature.arrow_forwardQUESTION 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_forward4. A short shunt compound generator supplies 100A at 110V. Armature resistance is 0.0502 and the shunt field resistance is 570 and the series field resistance is 0.0402. If the SPL is 852W, determine (119.1V) a) Eg b) Copper losses in c) n b.1) armature b.2) series b.3) shunt (520.2W) (400W) (228W) (84.62%)arrow_forward
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