Select the correct answer: 1- A 4-pole d.c. machine has (a) 2 (b) 8 (c) 4 (e) none of the above. 2- The series field of a short-shunt D.C. generator is excited by --- --- magnetic circuits. (d) 10 ------current. (c) armature (d) supply (e) none of the above. (a) shunt (b) load 3- The terminal voltage of a series generator is 150 V when the load current is 5 A. If the load current is increased to 10 A, the terminal voltage will be ---- ➖➖➖➖➖➖➖➖➖ (a) 150 V (b) less than 150 V (c) greater than 150 V (d) none of the above. 6320

Select the correct answer: 1- A 4-pole d.c. machine has (a) 2 (b) 8 (c) 4 (e) none of the above. 2- The series field of a short-shunt D.C. generator is excited by --- --- magnetic circuits. (d) 10 ------current. (c) armature (d) supply (e) none of the above. (a) shunt (b) load 3- The terminal voltage of a series generator is 150 V when the load current is 5 A. If the load current is increased to 10 A, the terminal voltage will be ---- ➖➖➖➖➖➖➖➖➖ (a) 150 V (b) less than 150 V (c) greater than 150 V (d) none of the above. 6320

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...

See similar textbooks

Similar questions

2- A 4-pole, wave-wound d.c. shunt generator has an armature winding consisting of 300 turns each of 0.0020. The armature resistance is a) 0.152 b)0.62 c) 0.30 d) none of above
(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
A thicker wire is used in the DC series field winding than DC shunt field winding in DC machines. * O because it carries the load current. O to prevent mechanical vibrations. O to provide strength. O to produce large flux. The speed of a DC motor can be changed by varying - armature resistance circuit O flux per pole O voltage source O all of above
Q 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 angle
A 2-pole d.c. shunt generator has a useful flux per pole of 0.03 Wb. The armature winding consist of 200 turns, each of 0.005 Q resistance. Calculate the terminal voltage when running at 1200 r.p.m. if the * .armature current is 40A
A 4 pole machine generates 250 volts when operated at 1500 rpm. If the flux per pole is 1.85 x 10°maxwell. The number of armature slots is 45 and the armature winding has two parallel paths. Calculate. a). the total number of armature conductor. b). the number of conductor in each slot c). If the speed of the generator is decrease to 1,350 rpm, what will be the generated voltage if the flux per pole is maintained at the value. d). To what value of flux per pole should the excitation be adjusted if the generated voltage is to remain the same. (Hint: Eav and Eg = lave x ²) ØXP X t
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
12) Welding generator will have A. Lap winding B. Wave winding C. Delta winding D. Duplex wave winding E. Star winding 13) The demagnetizing component of armature reaction in a D.C. generator A. Reduces generator e.m.f. B. Increases armature speed C. Reduces interpoles flux density A. Results in sparking trouble B. All above 14) As the load is increased the speed of D.C. shunt motor will A. Reduce slightly B. Increase slightly C. Increase proportionately D. Remains unchanged E. None of the above 15) The speed of a D.C. motor can be varied by varying A. Field current B. Applied voltage C. Resistance in series with armature D. Both A & B E. Any of the above
Which one of the following is not the function of pole shoes in a dc machine? (1) To reduce eddy current loss (2)To support the field coils (3)To spread out flux for better uniformity (4)To reduce the reluctance of the magnetic path (5)None of the above.
The dimensions of the circuit and the number of windings are indicated on the figure. a) Draw the equivalent circuit. b) Find the equivalent reluctance value of the magnetic circuit. c) Find the value of the total magneto-motor force produced by the coils wound on the magnetic core. d) Find the values of total magnetic flux and arm magnetic flux flowing through the magnetic circuit. e) Find the self-inductance value of each winding and the common inductance value between the windings.
1.4 A dc shunt generator when driven without connecting field winding shows an open circuit terminal voltage of 12 V. When field winding is connected and excited, the terminal voltage drops to zero because (a) field resistance is higher than critical resistance (b) there is no residual magnetism in the field circuit (c) field winding has got wrongly connected (d) there is a fault in armature circuit
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)