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2- The armature radius of a 4-pole jap wound mechine is 30 cin, the armature axial length is 40 cm then the pole pitch is approximately equal to a) 47cm --- b) 23.6 cm c) 1885cm d) 942.5 cn e) none of the previous

2- The armature radius of a 4-pole jap wound mechine is 30 cin, the armature axial length is 40 cm then the pole pitch is approximately equal to a) 47cm --- b) 23.6 cm c) 1885cm d) 942.5 cn e) none of the previous

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
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Answer only 2, 5, 7, 12
Q1] Multiple choice questions: 1- A duplex 4-pole lap wound d.c. machine has а) 8 b)4 с) 2 2- The armature radius of a 4-polc lap wound mechine is 30 cin, the armature axial length is 40 cm then the pole pitch is approximately equal to а) 47cm 3- The nature of armature winding of a d.c. nachine is decided by a) Front pitch b) pole pitch e) none of the previous. 4- A 4-pole triplex wave winding will have -- a) 12 b) 24 c) 2 d) 8 c) none of the previous. 5- A 4-pole lap wound shunt generator has an armature winding consisting of 1000 conductors each of 0.01 2, then the armature resistance is a) 102 6- In order to have sparkless commutation thc brushes should be placed a) Along G.N.A. b) along M.N.A. d) non of the previous 7- A 2-pole generator runs at-1200-rp.m. and generates an c.m.f. of 220V. The armature has 550 conductors. If the total flux per pole is 0.023 then the leakage factoris. а) 1.15 b) 1.2 с) 1.1 8- A separately excited d.c. generator is not used because a) Its costly b) voltge dops considerably with load c) separate d.c. source is required d) none of the previous 9- A d.c. generator that has poorest voltage regulation is a) flat compound generator b) series generator c) shunt generator d) over compound generator e) none of the previous magnetic circuits d) none of the previous. b) 23.6 cn c) 1885cm d) 942.5 cn e) none of the previous ------. c) back pitch d) commutator pitch paral'el paths. b) 2.52 c) 0.6252 d) 0.52 e) 5n f) none of the previous c) along G.N.A. or M.N.A. it d) 1 e) 0.87 f) none of the previous. 10- The mechanical power developed in a d.c. motor is maximum when back e.m.f. the applied voltage. b) one-third c) half d) none of the previous. A d.c. series motor will over speed when is equal to --------- a) twice Al- a) The load is increased b) the ficld is opened c) the armature circuit is opened' d) load is removed e) none of the previous. A 400V shunt motor has armature resistance of 0.52 and field resistance of 12- 2002. Calculate the back e.m.f when giving an output of 9.6kW at 80% efficiency. a) 414V b) 386V c) 375v d) 392V e) none of the previous
Transcribed Image Text:Q1] Multiple choice questions: 1- A duplex 4-pole lap wound d.c. machine has а) 8 b)4 с) 2 2- The armature radius of a 4-polc lap wound mechine is 30 cin, the armature axial length is 40 cm then the pole pitch is approximately equal to а) 47cm 3- The nature of armature winding of a d.c. nachine is decided by a) Front pitch b) pole pitch e) none of the previous. 4- A 4-pole triplex wave winding will have -- a) 12 b) 24 c) 2 d) 8 c) none of the previous. 5- A 4-pole lap wound shunt generator has an armature winding consisting of 1000 conductors each of 0.01 2, then the armature resistance is a) 102 6- In order to have sparkless commutation thc brushes should be placed a) Along G.N.A. b) along M.N.A. d) non of the previous 7- A 2-pole generator runs at-1200-rp.m. and generates an c.m.f. of 220V. The armature has 550 conductors. If the total flux per pole is 0.023 then the leakage factoris. а) 1.15 b) 1.2 с) 1.1 8- A separately excited d.c. generator is not used because a) Its costly b) voltge dops considerably with load c) separate d.c. source is required d) none of the previous 9- A d.c. generator that has poorest voltage regulation is a) flat compound generator b) series generator c) shunt generator d) over compound generator e) none of the previous magnetic circuits d) none of the previous. b) 23.6 cn c) 1885cm d) 942.5 cn e) none of the previous ------. c) back pitch d) commutator pitch paral'el paths. b) 2.52 c) 0.6252 d) 0.52 e) 5n f) none of the previous c) along G.N.A. or M.N.A. it d) 1 e) 0.87 f) none of the previous. 10- The mechanical power developed in a d.c. motor is maximum when back e.m.f. the applied voltage. b) one-third c) half d) none of the previous. A d.c. series motor will over speed when is equal to --------- a) twice Al- a) The load is increased b) the ficld is opened c) the armature circuit is opened' d) load is removed e) none of the previous. A 400V shunt motor has armature resistance of 0.52 and field resistance of 12- 2002. Calculate the back e.m.f when giving an output of 9.6kW at 80% efficiency. a) 414V b) 386V c) 375v d) 392V e) none of the previous
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