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Q(1) A 240V, series current and speed are 12A and 1500 r.p.m respectively. If the torque is reduced to 60 %. Determine the current and speed. Assume the flux produced is proportional to the current. Q3-(A)-Select the correct answer for the alternatives given 1- What is the effect on series DC motor speed if the field current is decreased? a) Motor will slow down b) Motor speed will increase c) Motor speed will not change d) The motor stops 2- A 6-pole lap wound shunt DC generator is supplying 295 A to load. The field current of generator is SA. The current through one of parallel paths of the armature is a) 300A, b) 150A c) 50A d) 145A 3- Inter pole windings are connected b) in series with the main poles d) in series with the armature a) in parallel with main poles, c) in series with the armature, 4- which item of the following are not rotating in DC machines o) commutator cements d) armature winding

Q(1) A 240V, series current and speed are 12A and 1500 r.p.m respectively. If the torque is reduced to 60 %. Determine the current and speed. Assume the flux produced is proportional to the current. Q3-(A)-Select the correct answer for the alternatives given 1- What is the effect on series DC motor speed if the field current is decreased? a) Motor will slow down b) Motor speed will increase c) Motor speed will not change d) The motor stops 2- A 6-pole lap wound shunt DC generator is supplying 295 A to load. The field current of generator is SA. The current through one of parallel paths of the armature is a) 300A, b) 150A c) 50A d) 145A 3- Inter pole windings are connected b) in series with the main poles d) in series with the armature a) in parallel with main poles, c) in series with the armature, 4- which item of the following are not rotating in DC machines o) commutator cements d) armature winding

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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Q(1) A 240V, series DC motor has armature and field resistances of 0.32 and 0.4 2 respectively. Its full load current and speed are 12A and 1500 r.p.m respectively. If the torque is reduced to 60 %. Determine the current and speed. Assume the flux produced is proportional to the current. Q3- (A)-Select the correct answer for the alternatives given 1- What is the effect on series DC motor speed if the field current is decreased? a) Motor will slow down b) Motor speed will increase c) Motor speed will not change d) The motor stops 2- A-6-pole lap wound shunt DC generator is supplying 295 A to load. The field current of generator is SA. The current through one of parallel paths of the armature is a) 300A b) 150A c) 50A d) 145A 3- Inter pole windings are connected b) in series with the main poles d) in series with the armature a) in parallel with main poles, c) in series with the armature, 4- which item of the following are not rotating in DC machines a) armature slots, b) carbon brushes; 5-Shunt generator is running at 1000 rpm, if flux is reduced by half. What is the new speed? a) 1000 r.p.m, b) 2000 r.p.m, c) 500 r.p.m., d) 0 r.p.m c) commutator segments, d) armature winding Q(1)(B)-Correct the false statements 1- When series de motor is operating without load, the armature draws excessive amount of current! 2-In DC machines the armature core is constructed of laminated steel sheets to reduces copper loss! 3- By field diverter method, the speed of series DC motor can be controlled above rated value! 4- To solve the Commutation Problem in large machines, Brush shifting is used!
Transcribed Image Text:Q(1) A 240V, series DC motor has armature and field resistances of 0.32 and 0.4 2 respectively. Its full load current and speed are 12A and 1500 r.p.m respectively. If the torque is reduced to 60 %. Determine the current and speed. Assume the flux produced is proportional to the current. Q3- (A)-Select the correct answer for the alternatives given 1- What is the effect on series DC motor speed if the field current is decreased? a) Motor will slow down b) Motor speed will increase c) Motor speed will not change d) The motor stops 2- A-6-pole lap wound shunt DC generator is supplying 295 A to load. The field current of generator is SA. The current through one of parallel paths of the armature is a) 300A b) 150A c) 50A d) 145A 3- Inter pole windings are connected b) in series with the main poles d) in series with the armature a) in parallel with main poles, c) in series with the armature, 4- which item of the following are not rotating in DC machines a) armature slots, b) carbon brushes; 5-Shunt generator is running at 1000 rpm, if flux is reduced by half. What is the new speed? a) 1000 r.p.m, b) 2000 r.p.m, c) 500 r.p.m., d) 0 r.p.m c) commutator segments, d) armature winding Q(1)(B)-Correct the false statements 1- When series de motor is operating without load, the armature draws excessive amount of current! 2-In DC machines the armature core is constructed of laminated steel sheets to reduces copper loss! 3- By field diverter method, the speed of series DC motor can be controlled above rated value! 4- To solve the Commutation Problem in large machines, Brush shifting is used!
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