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18. The external characteristic of a shunt generator can be obtained directly from its - characteristic. (a) internal (b) open-circuit (c) load-saturation (d ) performance 19. Load saturation characteristic of a d.c. generator gives relation between (a) V and Ia (b) E and Ia (c) E0 and If (d ) V and If 20. For the voltage built-up of a self-excited d.c. generator, which of the following is not an essential condition ? (a) There must be some residual flux (b) Field winding mmf must aid the residual flux (c) Total field circuit resistance must be less than the critical value (d) Armature speed must be very high.

18. The external characteristic of a shunt generator can be obtained directly from its - characteristic. (a) internal (b) open-circuit (c) load-saturation (d ) performance 19. Load saturation characteristic of a d.c. generator gives relation between (a) V and Ia (b) E and Ia (c) E0 and If (d ) V and If 20. For the voltage built-up of a self-excited d.c. generator, which of the following is not an essential condition ? (a) There must be some residual flux (b) Field winding mmf must aid the residual flux (c) Total field circuit resistance must be less than the critical value (d) Armature speed must be very high.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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Choose the correct answer only for the three of the following

18. The external characteristic of a shunt generator can be obtained directly from its – characteristic. (a) internal (b) open-circuit (c) load-saturation (d ) performance 19. Load saturation characteristic of a d.c. generator gives relation between (a) V and Ia (b) E and Ia (c) E0 and If (d) V and If 20. For the voltage built-up of a self-excited d.c. generator, which of the following is not an essential condition ? (a) There must be some residual flux (b) Field winding mmf must aid the residual flux (c) Total field circuit resistance must be less than the critical value (d) Armature speed must be very high. 21. The three factors which cause decrease in the terminal voltage of a shunt generator are (a) armature reactances (b) armature resistance (c) armature leakages (d) armature reaction (e) reduction in field current
Transcribed Image Text:18. The external characteristic of a shunt generator can be obtained directly from its – characteristic. (a) internal (b) open-circuit (c) load-saturation (d ) performance 19. Load saturation characteristic of a d.c. generator gives relation between (a) V and Ia (b) E and Ia (c) E0 and If (d) V and If 20. For the voltage built-up of a self-excited d.c. generator, which of the following is not an essential condition ? (a) There must be some residual flux (b) Field winding mmf must aid the residual flux (c) Total field circuit resistance must be less than the critical value (d) Armature speed must be very high. 21. The three factors which cause decrease in the terminal voltage of a shunt generator are (a) armature reactances (b) armature resistance (c) armature leakages (d) armature reaction (e) reduction in field current
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