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1- If number of poles in a lap wounded generator is increased by a factor 2, then generated emf will: a) Increase by a factor of 4 b) Remain same c) Increase by a factor 2 d) Decrease by a factor 2

1- If number of poles in a lap wounded generator is increased by a factor 2, then generated emf will: a) Increase by a factor of 4 b) Remain same c) Increase by a factor 2 d) Decrease by a factor 2

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Middle Technical University Subject: Electrical DC Machines Electrical Engineering Technical College Stage:2nd Department of Automation and Control Technologies Engineering Date: 13/2/2021 Lecture: Ali Kadhem Hamzah Note: Attempts to answer all questions QI: Select the right answer for the following: 1- If number of poles in a lap wounded generator is increased by a factor 2, then generated emf will: a) Increase by a factor of 4 b) Remain same c) Increase by a factor 2 d) Decrease by a factor 2 2- Which of the following accounts for smallest part of full load losses? a) Magnetic losses b) Mechanical losses c) Field copper loss d) Armature copper loss 3- Efficieney of ad.c. shunt generator is maximum when a) Stray losses are equal to copper losses b) Magnetic losses are equal to mechanical losses c) Armature copper losses are equal to constant losses d) Field copper losses are equal to constant losses 4- With the increase of the winding of a d.c. generator, terminal voltage will: c) Remain same a) Decrease b) Increase d) None of these 5- A single phase transformer has N = 200 turns ,N2 = 400 turns, connected to 120 V D.C source voltage, the output voltage V2 will be: a) 240 V b)0 V c) 120 V d) 360 v 6- For ad.c. shunt generator if the load increases, the output current will be while the field current will be a) Increase,increase b) increase,decrease c)increase,constant d) both constant. 7-In a transformer has specific iron loss, subjected to normal load. If the load has been doubled, the iron loss will a) As same as normal load b) increase e) decrease by half d) doubled 8- A shunt DC generator running at 1000 r.p.m. has generated as200 V. If the speed increases by20%, the generated voltage will nearly:
Transcribed Image Text:Middle Technical University Subject: Electrical DC Machines Electrical Engineering Technical College Stage:2nd Department of Automation and Control Technologies Engineering Date: 13/2/2021 Lecture: Ali Kadhem Hamzah Note: Attempts to answer all questions QI: Select the right answer for the following: 1- If number of poles in a lap wounded generator is increased by a factor 2, then generated emf will: a) Increase by a factor of 4 b) Remain same c) Increase by a factor 2 d) Decrease by a factor 2 2- Which of the following accounts for smallest part of full load losses? a) Magnetic losses b) Mechanical losses c) Field copper loss d) Armature copper loss 3- Efficieney of ad.c. shunt generator is maximum when a) Stray losses are equal to copper losses b) Magnetic losses are equal to mechanical losses c) Armature copper losses are equal to constant losses d) Field copper losses are equal to constant losses 4- With the increase of the winding of a d.c. generator, terminal voltage will: c) Remain same a) Decrease b) Increase d) None of these 5- A single phase transformer has N = 200 turns ,N2 = 400 turns, connected to 120 V D.C source voltage, the output voltage V2 will be: a) 240 V b)0 V c) 120 V d) 360 v 6- For ad.c. shunt generator if the load increases, the output current will be while the field current will be a) Increase,increase b) increase,decrease c)increase,constant d) both constant. 7-In a transformer has specific iron loss, subjected to normal load. If the load has been doubled, the iron loss will a) As same as normal load b) increase e) decrease by half d) doubled 8- A shunt DC generator running at 1000 r.p.m. has generated as200 V. If the speed increases by20%, the generated voltage will nearly:
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