(B) Draw the electrical and mechanical characteristics of cumulative and differential d.c compound motorsQ3-(A)- Indicate whether the following statements are true or false and correct the false statementsF-The armature voltage of d.c series generator is not affected by load current.In series d-e generator the field winding will be constructed from high number of turns and high cross-sectional area of wire.-If field resistance of a d.c. shunt generator is increased beyond its critical value, the generator outputvoltage will exceed its rated voltage4-The inter pole winding is connected in parallel to field windingGold resistance

The DC Electrical Generator are used to Generate DC voltage output to power a DC load. These are…

Q3-(A)- Indicate whether the following statements are true or false and correct the false statements F-The armature voltage of d.c series generator is not affected by load current. In series d-c generator the field winding will be constructed from high number of turns and high cross- sectional area of wire. If field resistance of a d.c. shunt generator is increased beyond its critical value, the generator output voltage will exceed its rated voltage The inter pole winding is connected in parallel to field winding

Q3-(A)- Indicate whether the following statements are true or false and correct the false statements F-The armature voltage of d.c series generator is not affected by load current. In series d-c generator the field winding will be constructed from high number of turns and high cross- sectional area of wire. If field resistance of a d.c. shunt generator is increased beyond its critical value, the generator output voltage will exceed its rated voltage The inter pole winding is connected in parallel to field winding

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Fill in the following blanks:1. Lap winding is suitable for ……. Voltage, …… current d.c. generators.2. The critical resistance of the d.c. generator is the resistance of ……. .
A 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)
Calculate the flux per pole required on full-load for a 50 kW, 400 V, 8-pole, 600 r.p.m. d.c. shunt generator with 256 conductors arranged in a lap-connected winding. The armature winding resistances is 0.1 Q, the shunt field resistance is 200 Q and there is a brush contact voltage drop of 1 V at each brush on full- [0.162 Wb] 5. load. Calculate the flux in a 4-pole dynamo with 722 armature conductors generating 500 V when running at 1000 r.p.m. when the armature is (a) lap connected (b) wave connected. [(a) 41.56 mWb (b) 20.78 mWb] (City & Guilds, London) 7. A 4-pole machine running at 1500 r.p.m. has an armature with 90 slots and 6 conductors per slot. The flux per pole is 10 mWb. Determine the terminal e.m.f. as d.c. Generator if the coils are lap-connected. If the current per conductor is 100 A, determine the electrical power. [810 V, 324 kW] (London Univ.) 8. An 8-pole lap-wound d.c. generator has 120 slots having 4 conductors per slot. If each conductor can carry 250 A and if…
Here it is the equivalent circuit of and induction motor and it is per phase circuit my question is name for me the variable for example R1 is the winding resistance and so an the all variable and please show me a pic of the real machine with the variable for example for R1 happens because of the winding i need to see the winding in the real machine, please help me to understand well
(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 conditions
Indicate whether the following - * statement are true or false False True In a dc machine for the same value of Z, N, O armature , e.m.f. is more with wave winding than with lap winding
In a separately excited generator supplying rated load the armature reaction. is always present is always absent O none of these may be sometimes present
1. The armature of D.C. generator is laminated to (a) Reduce the bulk (b) Provide the bulk (c) Reduce copper loss (d) Reduce eddy current loss 2. In case of D.C. machines, mechanical losses are primary function of (a) Current (b) Voltage (c) Speed (d) None of above 3. In a D.C. generator the critical resistance refers to the resistance of (a) Brushes (b) Field (c) Armature (d) Load 4. Which of the following does not change in an ordinary transformer ? (a) Frequency (b) Voltage (c) Current (d) Any of the above tion
A short shunt compound DC generator supplies a load of 10A at a voltage of 10 volts. If the resistances of Armature, shunt field and series field windings are 0.01 ohm, 1 ohm and 0.00 ohm respectively. c) write down the factors to improve the generated voltage. Generated Voltage is 10.2 V
Q3-(A)- Indicate whether the following statements are true or false and correct the false statements F-The armature voltage of d.c series generator is not affected by load current. In series d-c generator the field winding will be constructed from high number of turns and high cross- sectional area of wire. If field resistance of a d.c. shunt generator is increased beyond its critical value, the generator output voltage will exceed its rated voltage 4-The inter pole winding is connected in parallel to field winding
4- The generation of electricity achieved by moving a conductor in a magnetic field due to the relation E= ILB 5- In series d-c generator the field winding will be constructed from high number of turns and high cross- sectional area of wire. 6- Series motor maintains a more constant speed under varying load 7-The armature voltage of d.c series generator is not affected by load current. 8- In series d-c generator the field winding will be constructed from high number of turns and high cross- sectional area of wire. 9- If field resistance of a d.c. shunt generator is increased beyond its critical value, the generator output voltage will exceed its rated voltage 10-The inter pole winding is connected in parallel to field winding
A short shunt compound generator delivers 150A at a terminal voltage is 230V. The shunt field current is 2.5A. The resistances of the armature, series field and diverter are 0.032-ohm, 0.015 ohm and 0.03 ohm, respectively. Calculate the electrical efficiency of the generator at this load.